200 CCNA questions Part(1-100)

As system administrator, you type “debug ipx sap” and receive the following lines as part of the IOS response: type 0×4, “HELLO2″, 199.0002.0003.0006 (451), 2 hops type 0×4, “HELLO1″, 199.0002.0003.0008 (451), 2 hops What does “0×4″ signify?
* That is a Get Nearest Server response.
* That it is a General query.
* That it is a General response.
* That it is a Get Nearest Server request.
Correct answer: A
To monitor IP igrp traffic, you can use “debug IP igrp transaction” or “debug IP igrp events”. How do you display information about IPX routing update packets?
* debug routing
* debug ipx transaction
* debug ipx routing activity
* debug ipx events
Correct answer: C

To monitor ipx traffic on a network, what command would you use?
* debug ipx transaction
* show ipx traffic
* show ipx events
* display ipx traffic
Correct answer: B
What command would you use to find out the names of Novell servers on a network?
* show ipx servers
* show ipx hosts
* show ipx sap
* show ipx nodes.
Correct answer: A
The “ipx delay number” command will allow an administrator to change the default settings. What are the default settings?
* For LAN interfaces, one tick; for WAN interfaces, six ticks
* For LAN interfaces, six ticks; for WAN interfaces, one tick
* For LAN interfaces, zero ticks; for WAN interfaces, five ticks
* For LAN interfaces, five ticks; for WAN interfaces, zero Ticks
Correct answer: A
The default is–for LAN interfaces, one tick; for WAN interfaces, six ticks
As a system administrator, you need to set up one Ethernet interface on the Cisco router to allow for both sap and Novell-ether encapsulations. Which set of commands will accomplish this?
* interface ethernet 0.1 ipx encapsulation Novell-ether ipx network 9e interface ethernet 0.2 ipx network 6c
* interface ethernet 0 ipx encapsulation Novell-ether ipx network 9e interface ethernet 0 ipx encapsulation sap ipx network 6c
* interface ethernet 0.1 ipx encapsulation Novell-ether interface ethernet 0.2 ipx encapsulation sap
* interface ethernet 0.1ipx encapsulation Novell-ether ipx network 9e interface ethernet 0.2 ipx encapsulation sap ipx network 6c
Correct answer: D
The following commands setup the subinterfaces to allow for two types of encapsulation: interface ethernet 0.1 ipx encapsulation Novell-ether ipx network 9e interface ethernet 0.2 ipx encapsulation sap ipx network 6c
What does the “IPX maximum-paths 2″ command accomplish?
* It enables load sharing on 2 paths if the paths are equal metric paths.
* It sets up routing to go to network 2.
* It is the default for Cisco IPX load sharing.
* It enables load sharing on 2 paths if the paths are unequal metric paths.
Correct answer: A
It enables load sharing on 2 paths if the paths are equal metric paths. The default is 1 path and the maximum is 512 paths.
You want to enable both arpa and snap encapsulation on one router interface. How do you do this?
* The interface can handle multiple encapsulation types with no extra configuration.
* Assign two network numbers, one for each encapsulation type.
* Enable Novell-ether to run multiple encapsulation types.
* Both arpa and snap are enabled by default so you don’t have to configure anything.
Correct answer: B
To assign multiple network numbers, you usually use subinterfaces. A sample configuration follows: ipx ethernet 0.1 ipx encapsulation novell-ether ipx network 9e interface ethernet 0.2 ipx encapsulation sap ipx network 6c
By default, Cisco routers forward GNS SAPs to remote networks.
* False
* True
Correct answer: A
GNS is Novell’s protocol to Get Nearest Server. If there is a server on the local network, that server will respond. If there isn’t, the Cisco router has to be configured to forward the GNS SAP.
To prevent Service Advertisements (SAPs) from flooding a network, Cisco routers do not forward them. How are services advertised to other networks?
* Each router builds its own SAP table and forwards that every 60 seconds.
* Each router assigns a service number and broadcasts that.
* SAPs aren’t necessary with Cisco routers.
* Cisco routers filter out all SAPs.
Correct answer: A
Cisco routers build SAP tables and forward the table every 60 seconds. All SAPs can’t be filtered even with 4.x since NDS and time synchronization uses SAPs.
Novell’s implementation of RIP updates routing tables every ____ seconds.
* 60
* 90
* 10
* 30
Correct answer: A
Novell’s RIP updates routing tables every 60 seconds, Apple’s RTMP is every 10 seconds, routers ARP every 60 seconds, IGRP signal every 90 seconds, and Banyan VINES signals every 90 seconds.
In Novell’s use of RIP, there are two metrics used to make routing decisions. Select the two metrics.
* Ticks.
* Hops
* Loops
* Counts
Correct answer: A &B
It first uses ticks (which is about 1/18 sec.); if there is a tie, it uses hops; if hops are equal, then it uses an administratively assigned tiebreaker.
What is the Cisco name for the encapsulation type used on a serial interface?
* HDLC
* SDLC
* SAP
* SNAP
Correct answer: A
“arpa” is used by the Cisco IOS for which encapsulation types?
* Ethernet_II
* Ethernet_802.3
* Ethernet_802.2
* Ethernet_SNAP
Correct answer: A
Novell’s IPX and Cisco’s IOS name their protocols differently. Cisco uses sap for Ethernet_802.2, Token-Ring, and Novell’s FDDI_802.2. Cisco uses snap for Ethernet_SNAP, Token-Ring_SNAP, and FDDI_SNAP. Cisco uses arpa for Ethernet_II and, finally the default is Novell-ether for Novell’s Ethernet_802.3. “snap” is used by the Cisco IOS for which encapsulation types?
* Ethernet_SNAP
* Token-Ring_SNAP
* FDDI_SNAP
* Novell-SNAP
* Novell-FDDI.
Correct answer: A,B &C
Novell’s IPX and Cisco’s IOS name their protocols differently. Cisco uses sap for Ethernet_802.2, Token-Ring, and Novell’s FDDI_802.2. Cisco uses snap for Ethernet_SNAP, Token-Ring_SNAP, and FDDI_SNAP. Cisco uses arpa for Ethernet_II and, finally the default is Novell-ether for Novell’s Ethernet_802.3.15 “sap” is used by the Cisco IOS for which encapsulation types?
* Ethernet_802.2
* Token-Ring
* FDDI_SNAP
* Ethernet_802.3
* FDDI_802.2
Correct answer: A,B &E
Novell’s IPX and Cisco’s IOS name their protocols differently. Cisco uses sap for Ethernet_802.2, Token-Ring, and Novell’s FDDI_802.2. Cisco uses snap for Ethernet_SNAP, Token-Ring_SNAP, and FDDI_SNAP. Cisco uses arpa for Ethernet_II and, finally the default is Novell-ether for Novell’s Ethernet_802.3. Which type of Ethernet framing is used for TCP/IP and AppleTalk?
* Ethernet 802.3
* Ethernet 802.2
* Ethernet II
* Ethernet SNAP
Correct answer: D
Ethernet 802.3 is used with NetWare versions 2 through 3.11, Ethernet 802.2 is used with NetWare 3.12 and later plus OSI routing, Ethernet II is used with TCP/IP and DECnet, and Ethernet SNAP is used with TCP/IP and AppleTalk.
Which type of Ethernet framing is used for TCP/IP and DECnet?
* Ethernet 802.3
* Ethernet 802.2
* Ethernet II
* Ethernet SNAP
Correct answer: C
Ethernet 802.3 is used with NetWare versions 2 through 3.11, Ethernet 802.2 is used with NetWare 3.12 and later plus OSI routing, Ethernet II is used with TCP/IP and DECnet, and Ethernet SNAP is used with TCP/IP and AppleTalk.
You are a system administrator on a NetWare network, you are running NetWare 4.11 and you cannot communicate with your router. What is the likely problem?
* NetWare 4.11 defaults to 802.2 encapsulation.
* NetWare 4.11 defaults to 802.3 encapsulation
* Cisco routers only work with NetWare 3.11.
* NetWare 3.11 defaults to 802.2 encapsulation.
Correct answer: A
The default encapsulation on Cisco routers is Novell Ethernet_802.3 and NetWare 3.12 and later defaults to 802.2 encapsulation, 3.11 and earlier defaults to 802.3.
NetWare IPX addressing uses a network number and a node number. Which statements are true?
* The network address is administratively assigned and can be up to 16 hexadecimal digits long.
* The node address is always administratively assigned.
* The node address is usually the MAC address.
* If the MAC address is used as the node address, then IPX eliminates the use of ARP.
Correct answer: A, C &D
The network address can be up to 16 hexadecimal digits in length. The node number is 12 hexadecimal digits. The node address is usually the MAC address. An example IPX address is 4a1d.0000.0c56.de33. The network part is 4a1d. The node part is 0000.0c56.de33. The network number is assigned by the system administrator of the Novell network.
Which NetWare protocol works on layer 3–network layerÃ¢â‚¬â€of the OSI model?
* IPX
* NCP
* SPX
* NetBIOS
Correct answer: A
IPX (Internetwork Packet Exchange) is a NetWare network layer 3 protocol used for transferring information on LANs.
Which NetWare protocol provides link-state routing?
* NLSP
* RIP
* SAP
* NCP
Correct answer: A
NetWare Link Services Protocol (NLSP) provides link-state routing. SAP (Service Advertisement Protocol) advertises network services. NCP (NetWare Core Protocol) provides client-to-server connections and applications. RIP is a distance vector routing protocol.
As a system administrator, you want to debug igrp but are worried that the “debug IP igrp transaction” command will flood the console. What is the command that you should use?
* debug IP igrp event
* debug IP igrp-events
* debug IP igrp summary
* debug IP igrp events
Correct answer: D
The “debug IP igrp events” is used to only display a summary of IGRP routing information. You can append an IP address onto either command to see only the IGRP updates from a neighbor.
What does the following series of commands accomplish? router igrp 71 network 10.0.0.0 router igrp 109 network 172.68.7.0
* It isolates networks 10.0.0.0 and 172.68.7.0.
* It loads igrp for networks 109 and 71.
* It disables RIP.
* It disables all routing protocols.
Correct answer: A
It isolates network 10.0.0.0 and 172.68.7.0 and associates autonomous systems 109 and 71 with IGRP. IGRP does not disable RIP, both can be used at the same time.
In the command “router igrp 109″ what does 109 signify?
* an autonomous system
* any network number which the router is attached to
* the allowable length of the routing table
* the network socket number
Correct answer: A
The Cisco IOS global configuration command “router igrp xxx” is used to configure the Interior Gateway Routing Protocol. In this case, the 109 is called the process-id , which can also be used for an autonomous system number.
IGRP supports a feature that allows traffic to be distributed among up to 6 (4 default) paths to provide greater overall throughput and reliability. What is this called?
* unequal-cost load balancing
* equal-cost load balancing
* proportionate load balancing
* low cost load balancing
Correct answer: A
An unequal-cost load balancing is used to provide alternate paths for data distribution on an internetwork. Cisco developed this method to use unused or under utilized links to increase bandwidth and network availability.
IGRP uses flash updates, poison reverse updates, holddown times, and split horizon. How often does it broadcast its routing table updates?
* 90 seconds
* 10 seconds
* 30 seconds
* 45 seconds
Correct answer: A
The command “show IP protocol” displays which information?
* routing timers
* network information
* contents of the IP routing table
* information about all known network and subnetworks
Correct answer: A & B
“show IP protocol” displays routing timers and network information. “show IP route” displays the routing table with information about all known networks and subnetworks.
When using RIP, routing updates are broadcast every ____ seconds.
* 30
* 10
* 60
* 90
Correct answer: A
Novell’s RIP updates routing tables every 60 seconds, Apple’s RTMP is every 10 seconds, routers ARP every 60 seconds, DECnet hosts and IGRP signal every 15 seconds, and Banyan VINES signals every 90 seconds.
An autonomous system can only exist if all routers in that system meet which criteria?
* interconnected
* run the same routing protocol
* assigned same autonomous system number
* run IGRP only
* run RIP only
Correct answer: A,B &C
An autonomous system is a set of routers and networks under the same administration. Each router must be interconnected, run the same routing protocol, and assigned the same autonomous system number. The network Information Center (NIC) assigns a unique autonomous system number to enterprises.
A default route is analogous to a _________.
* default gateway
* static route
* dynamic route
* one-way route
Correct answer: A
A default route is analogous to a default gateway. It is used to reduce the length of routing tables and to provide complete routing capabilities when a router might not know the routes to all other networks.
Routers can learn about destinations through static routes, default, or dynamic routing. By default, a router will use information derived from __________.
* IGRP
* RIP
* IP
* TCP
Correct answer: A
The quality of information is rated:
Connected interface 0
Static route 1
IGRP 100
RIP 120
Unknown 255
The lower the value, the more reliable the source with 255 signifying information that the router will ignore. So, the router will use IGRP, rated at 100, before RIP, rated at 120.
You are logged into a router, what command would show you the IP addresses of routers connected to you?
* show cdp neighbors detail
* show run
* show neighbors
* show cdp
Correct answer: A
As a system administrator, you perform an extended ping at the privileged EXEC prompt. As part of the display, you see “Set DF bit in IP header? [yes] :” What would happen if you answered no at the prompt.
* This lets the router fragment the packet.
* It tells the router not to fragment the packet.
* This lets the router direct the packet to the destination it finds in its routing table.
* It tell the router to send the packet to the next hop router
Correct answer: A
“Set DF bit in IP header?” is a response to an extended ping at the router. If you answer yes (the default) the router will not fragment the packet. If you answer no, the router will fragment the packet.
You have typed “ping” 172.16.101.1 and get the following display: Type escape sequence to abort. Sending 5, 100-byte ICMP Echoes to 172.16.101.1, timeout is 2 seconds:
.!!!!
What does the “.” signify?
* That one message timed out.
* That all messages were successful.
* That one message was successful.
* That one message completed in under the allotted timeframe.
Correct answer: A
The possible responses from the ping command are: ! Successful receipt of an echo reply. Timed out waiting for a reply U Destination unreachable C Congestion-experienced packet I Ping interrupted ? Packet type unknown & Packet TTL exceeded
Which command, that is used to test address configuration, uses Time-To-Live (TTL) values to generate messages from each router.
* trace
* ping
* telnet
* bootp
Correct answer: A
The Cisco IOS EXEC command “trace [protocol] [destination]” is used to discover routes that packets will travel to their destination hosts. Trace uses TTL (Time to Live) values to report destination route information.
What does the command “IP name-server 255.255.255.255″ accomplish? * It sets the domain name lookup to be a local broadcast.
* This is an illegal command.
* It disables domain name lookup.
* The command is now defunct and has been replaced by “IP server-name ip any”
Correct answer: A
By default DNS is enabled on a router with a server address of 255.255.255.255, which provides for a local broadcast.
As a system administrator, you need to provide your routers with a Domain Name System (DNS) server. How many DNS servers can you specify with one command?
* 6
* 1
* 2
* 4
Correct answer: A
You can only specify six name servers in one command. The syntax is “IP name-server server-address1 [[ server-address2 ]…server-address6]. You must also enable
DNS.
How would you configure one host name that points to two IP addresses?
* IP host jacob 1.0.0.5 2.0.0.8
* IP jacob 1.0.0.5 2.0.0.8
* IP host jacob 1.0.0.5
* IP host duplicate “all”
Correct answer: A
The correct syntax is IP host name [ TCP-port-number ] address [ address ]….. So, “IP host P1R1 1.0.0.5 2.0.0.8″ is the correct choice. “IP host jacob 1.0.0.5″ only points the host name jacob to one IP address–1.0.0.5.
The following selections show the command prompt and the configuration of the IP network mask. Which two are correct?
* Router#term IP netmask-format { bitcount | decimal | hexadecimal }
* Router(config-if)#IP netmask-format { bitcount | decimal | hexadecimal }
* Router(config-if)#netmask-format { bitcount | decimal | hexadecimal }
* Router#ip netmask-format { bitcount | decimal | hexadecimal }
Correct answer: A & B
Router#term IP netmask-format { bitcount | decimal | hexadecimal } and Router(config-if)#IP netmask-format { bitcount | decimal | hexadecimal } are correct. You can configure the mask for the current session and you can configure it for a specific line.
When configuring the subnet mask for an IP address, which formats can be used?
* dotted-decimal.
* Hexadecimal
* Bit-count
* Octal
* Binary
Correct answer: A, B &C
You are given the following address: 153.50.6.27/25. Determine the subnet mask, address class, subnet address, and broadcast address.
* 255.255.255.128, B,153.50.6.0, 153.50.6.127
* 255.255.255.128, C,153.50.6.0, 153.50.6.127
* 255.255.255.128, C,153.50.6.127, 153.50.6.0
* 255.255.255.224, C,153.50.6.0, 153.50.6.127
Correct answer: A
You are given the following address: 128.16.32.13/30. Determine the subnet mask, address class, subnet address,
and broadcast address.
* 255.255.255.252, B,128.16.32.12, 128.16.32.15
* 255.255.255.252, C,128.16.32.12, 128.16.32.15
* 255.255.255.252, B,128.16.32.15, 128.16.32.12
* 255.255.255.248, B,128.16.32.12, 128.16.32.15
Correct answer: A
You are given the following address: 15.16.193.6/21. Determine the subnet mask, address class, subnet address,
and broadcast address.
* 255.255.248.0, A, 15.16.192.0, 15.16.199.255
* 255.255.248.0, B, 15.16.192.0, 15.16.199.255
* 255.255.248.0, A, 15.16.199.255, 14.15.192.0
* 255.255.242.0, A, 15.16.192.0, 15.16.199.255
Correct answer: A
You have an IP host address of 201.222.5.121 and a subnet mask of 255.255.255.248. What is the broadcast address?
* 201.222.5.127
* 201.222.5.120
* 201.222.5.121
* 201.222.5.122
Correct answer: A
The easiest way to calculate this is to subtract 255.255.255.248 (subnet mask) from 255.255.255.255, this
equals 7. Convert the address 201.222.5.121 to binary–11001001 11011110 00000101 01111001. Convert the
mask 255.255.255.248 to binary–11111111 11111111 11111111 11111000. AND them together to get: 11001001 11011110
01111000 or 201.222.5.120. 201.222.5.120 is the subnet address, add 7 to this address for 201.222.5.127 or
the broadcast address. 201.222.5.121 through 201.222.5.126 are the valid host addresses.
Given the address 172.16.2.120 and the subnet mask of 255.255.255.0. How many hosts are available?
* 254
* 510
* 126
* 16,372
Correct answer: A
172.16.2 120 is a standard Class B address with a subnet mask that allows 254 hosts. You are a network administrator and have been assigned the IP address of 201.222.5.0. You need to have 20 subnets with 5 hosts per subnet. The subnet mask is 255.255.255.248.
Which addresses are valid host addresses?
* 201.222.5.17
* 201.222.5.18
* 201.222.5.16
* 201.222.5.19
* 201.222.5.31
Correct answer: A,B & D
Subnet addresses in this situation are all in multiples of 8. In this example, 201.222.5.16 is the subnet, 201.22.5.31 is the broadcast address. The rest are valid host IDs on subnet 201.222.5.16.
You are a network administrator and have been assigned the IP address of 201.222.5.0. You need to have 20 subnets with
hosts per subnet. What subnet mask will you use?
* 255.255.255.248
* 255.255.255.128
* 255.255.255.192
* 255.255.255.240
Correct answer: A
By borrowing 5 bits from the last octet, you can. have 30 subnets. If you borrowed only 4 bits you could only have 14 subnets. The formula is (2 to the power of n)-2. By borrowing 4 bits, you have (2×2x2×2)-2=14. By borrowing 5 bits, you have (2×2x2×2x2)-2=30. To get 20 subnets, you would need to borrow 5 bits so the subnet mask would be 255.255.255.248.
You are given the IP address of 172.16.2.160 with a subnet mask of 255.255.0.0. What is the network address in binary?
* 10101100 00010000
* 00000010 10100000
* 10101100 00000000
* 11100000 11110000
Correct answer: A
To find the network address, convert the IP address to binary–10101100 000100000 00000010 10100000–then ANDed it with the subnet mask–11111111 11111111 00000000 00000000. The rest is 10101100 00010000 00000000 00000000, which is 172.16.0.0 in decimal.
The first octet rule states that the class of an address can be determined by the numerical value of the first octet.
Which addresses are INCORRECTLY paired with their class?
* 128 to 191, Class B
* 192 to 223 Class B
* 128 to 191, Class C
* 192 to 223, Class C
Correct answer: B & C
Address classes are: 1 to 126, Class A; 128 to 191, Class B, 192 to 223, Class C; 224 to 239, Class D; and
to 255, Class E. The first octet rule states that the class of an address can be determined by the numerical value of the first octet.
Which addresses are INCORRECTLY paired with their class?
* 1 to 126, Class A
* 128 to 191, Class A
* 1 to 126, Class B
* 128 to 191, Class B
Correct answer: B & C.
Address classes are: 1 to 126, Class A; 128 to 191, Class B, 192 to 223, Class C; 224 to 239, Class D; and
to 255, Class E. The first octet rule states that the class of an address can be determined by the numerical value of the first octet.
Which addresses are INCORRECTLY paired with their class?
* 240 - 255, Class D
* 240 - 255, Class E
* 224 - 239, Class D
* 224 - 239, Class E
Correct answer: A & D
Address classes are: 1 to 126, Class A; 128 to 191, Class B, 192 to 223, Class C; 224 to 239, Class D; and 240 to 255, Class E.
Which IP Address Class is INCORRECTLY paired with its range of network numbers?
* Class A addresses include 192.0.0.0 through 223.255.255.0
* Class A addresses include 1.0.0.0 through 126.0.0.0
* Class B addresses include 128.0.0.0 through 191.255.0.0
* Class C addresses include 192.0.0.0 through 223.255.255.0
* Class D addresses include 224.0.0.0 through 239.255.255.0
Correct answer: A
Class A addresses include 1.0.0.0 through 126.0.0.0
Class B addresses include 128.0.0.0 through 191.255.0.0
Class C addresses include 192.0.0.0 through 223.255.255.0
Class D addresses include 224.0.0.0 through 239.255.255.0
Which IP Address Class can have 16 million subnets but support 254 hosts?
* Class C
* Class A
* Class B
* Class D
Correct answer: A
Possible Subnets IP Address Class Possible Hosts
A 16M.
64K B 64K
16M C 254
Which IP Address Class can have 64,000 subnets with 64,000 hosts per subnet?
* Class B
* Class A
* Class C
* Class D
Correct answer: A
IP Address Class Possible Subnets Possible Hosts
A 16M
64K B 64K
16M C 254
There are two processes to pair MAC address with IP addresses. Which process finds an IP address from a MAC address?
* RARP
* ARP
* RIP
* IGRP
Correct answer: A
ARP (Address Resolution Protocol) maps an IP address to the MAC address, RARP (Reverse Address Resolution Protocol) maps the MAC address to the IP address. ARP and RARP work at the internet layer of the Internet Model or the network layer of the OSI model.
When the router runs out of buffer space, this is called ________.
* Source Quench
* Redirect
* Information Request
* Low Memory
Correct answer: A
Source quench is the process where the destination router, or end internetworking device will “quench” the date from the “source”, or the source router. This usually happens when the destination router runs out of buffer space to process packets.
Which protocol carries messages such as destination Unreachable, Time Exceeded, Parameter Problem, Source Quench, Redirect, Echo, Echo Reply, Timestamp, Information Request, Information Reply, Address Request, and Address Reply?
* ICMP
* UDP
* TCP
* TFTP
* FTP
Correct answer: A
ICMP (Internet Control Message Protocol) is a network layer internet protocol described in RFC # 792. ICMP reports IP packet information such as destination Unreachable, Time Exceeded, Parameter Problem, Source Quench, Redirect, Echo, Echo Reply, Timestamp, Information Request, Information Reply, Address Request, and Address Reply.
Two of the protocols that can be carried in the Protocol field of an IP packet are?
* TCP
* UDP
* FTP
* TFTP
Correct answer: A & B
The following are the fields in an IP segment,
their length, and their definitions:
VERS (Version number - 16 bits)
HLEN (Number of 32-bit words in the header - 4 bits)
Type of Server (How the datagram should be handled - 32 bits)
Total Length (Total length of header and data - 32 bits)
Identification (Provide fragmentation of datagrams to allow different MTUs in the internet - 4 bits)
Flags (Provide fragmentation of datagrams to allow different MTUs in the internet - 4 bits)
Frag Offset (Provide fragmentation of datagrams to allow different MTUs in the internet - 6 bits)
TTL (Time-To-Live - 6 bits)
Protocol (Upperlayer protocol sending the datagram - 16 bits)
Header Checksum )Integrity check on the header - 16 bits)
Source IP Address (32 bits)
Destination IP Address (32 bits)
IP Options (network testing, debugging, security and others - 4 bits)
Data (4 bits).
Where would network testing be included in an IP packet?
* IP Options field
* Identification field
* Type of Service field
* Reservation field
Correct answer: A
The following are the fields in an IP segment, their length, and their definitions:
VERS (Version number - 16 bits)
HLEN (Number of 32-bit words in the header - 4 bits)
Type of Server (How the datagram should be handled - 32 bits)
Total Length (Total length of header and data - 32 bits)
Identification (Provide fragmentation of datagrams to allow different MTUs in the internet - 4 bits)
Flags (Provide fragmentation of datagrams to allow different MTUs in the internet - 4 bits)
Frag Offset (Provide fragmentation of datagrams to allow different MTUs in the internet - 6 bits)
TTL (Time-To-Live - 6 bits)
Protocol (Upperlayer protocol sending the datagram - 16 bits)
Header Checksum )Integrity check on the header - 16 bits)
Source IP Address (32 bits)
Destination IP Address (32 bits)
IP Options (network testing, debugging, security and others - 4 bits)
Data (4 bits).
What field tells the Internet layer how to handle an IP packet?
* Type of Service
* Identification
* Flags
* Frag Offset
Correct answer: A
The following are the fields in an IP segment, their length, and their definitions:
VERS (Version number - 16 bits)
HLEN (Number of 32-bit words in the header - 4 bits)
Type of Server (How the datagram should be handled - 32 bits)
Total Length (Total length of header and data - 32 bits)
Identification (Provide fragmentation of datagrams to allow different MTUs in the internet - 4 bits)
Flags (Provide fragmentation of datagrams to allow different MTUs in the internet - 4 bits)
Frag Offset (Provide fragmentation of datagrams to allow different MTUs in the internet - 6 bits)
TTL (Time-To-Live - 6 bits)
Protocol (Upperlayer protocol sending the datagram - 16 bits)
Header Checksum )Integrity check on the header - 16 bits)
Source IP Address (32 bits)
Destination IP Address (32 bits)
IP Options (network testing, debugging, security and others - 4 bits) Data (4 bits).
Which fields of an IP packet provide for fragmentation of datagrams to allow differing MTUs in the internet?
* Identification
* Flags
* Frag Offset
* Type of Service
* Total Length
Correct answer: A, B & C
The following are the fields in an IP segment, their length, and their definitions:
VERS (Version number - 16 bits)
HLEN (Number of 32-bit words in the header - 4 bits)
Type of Server (How the datagram should be handled - 32 bits)
Total Length (Total length of header and data - 32 bits)
Identification (Provide fragmentation of datagrams to allow different MTUs in the internet - 4 bits)
Flags (Provide fragmentation of datagrams to allow different MTUs in the internet - 4 bits)
Frag Offset (Provide fragmentation of datagrams to allow different MTUs in the internet - 6 bits)
TTL (Time-To-Live - 6 bits)
Protocol (Upperlayer protocol sending the datagram - 16 bits)
Header Checksum )Integrity check on the header - 16 bits)
Source IP Address (32 bits)
Destination IP Address (32 bits)
IP Options (network testing, debugging, security and others - 4 bits)
Data (4 bits).
Which processes does TCP, but not UDP, use?
* Windowing
* Acknowledgements
* Source Port
* Destination Port
Correct answer: A & B
UDP (User Datagram Protocol) does not use sequence or acknowledgement fields in transmission.
UDP is a connectionless and unreliable protocol, since there is no delivery checking mechanism in the UDP data format.
What is the UDP datagram format?
* Source Port - 16 bits, Destination Port - 16 bits, Length - 16 Bits, Checksum - 16 bits, Data
* Destination Port - 16 bits, Source Port - 16 bits, Length - 16 Bits, Checksum - 16 bits, Data
* Source Port - 16 bits, Destination Port - 16 bits, Checksum - 16 Bits, Length - 16 bits, Data
* Source Port - 8 bits, Destination Port - 8 bits, Length -8 Bits, Checksum - 8 bits, Data
Correct answer: A
The UDP format for a segment is as follows:
Source Port 16 bits
Destination Port 16 bits
Length 16 bits
Checksum 16 bits
Data xx bits
What is the function of DDR on Cisco routers?
* DDR is dial–on-demand routing. It provides a continuous LAN only connection.
* DDR is dial-on-demand routing. It provides routing for high volume traffic.
* DDR is dial–on-demand routing. It provides a continuous WAN connection.
* DDR is dial-on-demand routing. It provides routing for low volume and periodic traffic.
Correct answer: D
DDR is dial-on-demand routing. It provides routing for low volume and periodic traffic. It initiates a call to a remote site when there is traffic to transmit.
What are the two types of access lists that can be configured on a Cisco router?
* Standard
* Extended
* Filtering
* Packet
Correct answer: A & B
The access lists are standard and extended. Standard access lists for IP check the source address of packets that could be routed. Extended access lists can check the source and destination packet plus check for specific protocols, port numbers, etc.
When using access lists, what does a Cisco router check first?
* To see if the packet is routable or bridgeable
* The destination address
* The source address
* The packet contents
Correct answer: A
The first thing checked is to see if the packet is routable or bridgeable. If it is not, the packet will be dropped.
How many access lists are allowed per interface?
* One per port, per protocol
* Two per port, per protocol
* Unlimited
* Router interface +1 per port.
Correct answer: A
Only one access list is allowed per interface. An access list must have conditions that test true for all packets that use the access list.
What do the following commands accomplish?
access-list 1 deny 172.16.4.0 0.0.0.255
access-list 1 permit any interface ethernet 0
IP access-group 1 out
* This will block traffic from subnet 172.16.4.0 and allow all other traffic.
* This will allow traffic from subnet 172.16.4.0 and block all other traffic.
* All traffic is allowed.
* All traffic is blocked.
Correct answer: A
This will block traffic from subnet 172.16.4.0 and allow all other traffic. The first statement “access-list 1 deny 172.16.4.0 0.0.0.255″ will deny access to the subnet 172.16.4.0.
What do the following statements in an extended access list accomplish?
access-list 101 deny TCP 172.16.4.0 0.0.0.255 172.16.3.0 0.0.0.255 eq 21
access-list 101 deny TCP 172.16.4.0 0.0.0.255 172.16.3.0 0.0.0.255 eq 20
access-list 101 permit TCP 172.16.4.0 0.0.0.255 0.0.0.0 255.255.255.255
* This will block ftp traffic.
* This will block http traffic.
* This will permit ftp traffic.
* This will permit tftp traffic.
Correct answer: A
This will block ftp traffic since ftp uses ports 20 and 21.
Access lists are numbered. Which of the following ranges could be used for an IP access list?
* 600 - 699
* 100 - 199
* 1 - 99
* 800 - 899
* 1000 - 1099
Correct answer: wer: B & C
AppleTalk access lists use numbers in the 600 - 699 range. IP uses 1 - 99 for standard access lists or 100-199 for extended access lists. IPX uses 800 - 899 or 900 - 999 for extended access lists. IPX SAP filters use 1000 - 1099.
Cisco routers use wildcard masking to identify how to check or ignore corresponding IP address bits. What does setting a wildcard mask bit to 0 cause the router to do?
* It tells the router to check the corresponding bit value.
* It tells the router to ignore the corresponding bit value.
* It tells the router to check its alternate routing list.
* It tells the router to use its primary routing list.
Correct answer: A
It tells the router to check the corresponding bit value.
You are a system administrator and you want to deny access to a group of computers with addresses 172.30.16.0 to 172.30.31.0. Which wildcard mask would you use?
* 0.0.15.255
* 0.0.255.255
* 0.0.31.255
* 0.0.127.255
* 0.0.255.255
Correct answer: A
0.0.15.255 will check the last 13 bits of an address so that computers 172.30.16.0 to 172.30.31.0 will be denied access. 0.0.31.255 would check the last 6 binary digits and deny access to addresses 172.30.32.0 to 172.30.63.0. 0.0.127.255 would check the last 7 binary digits and deny access to addresses 172.30.64.0 to 172.30.127.0. 0.0.255.255 would deny 172.30.0.0 to 172.30.254.0. If you write decimal 15 in binary, you have 0001111, the 1’s tell the router to ignore address with these bits set; 0’s tell the router to check the bits. The third octet for 172.30.16.0 is 00010000. The third octet for 172.30.31.0 would be 00011111. So, traffic from these addresses would be denied.
In order to limit the quantity of numbers that a system administrator has to enter, Cisco can use which abbreviation to indicate 0.0.0.0?
* host
* any
* all
* include
Correct answer: A
Cisco uses host to specify 0.0.0.0. This tells the router to check all. Cisco uses any to specify 255.255.255.255. This tells the router to ignore all and permit any address to use an access list test.
What do the following commands accomplish?
access-list 1 permit 172.16.0.0 0.0.255.255
interface ethernet 0
IP access-group 1 out
interface ethernet 1
IP access-group 1 out
* Only traffic from the source network 172.16.0.0 will be blocked.
* Only traffic from the source network 172.16.0.0 will be forwarded. Non-172.16.0.0 network traffic is blocked.
* Non-172.16.0.0 traffic will be forwarded.
* All traffic will be forwarded.
Correct answer: B
Only traffic from the source network 172.16.0.0 will be forwarded. Non-172.16.0.0 network traffic is blocked. The wildcard mask 0.0.255.255 tells the router to check the first 2 octets and to ignore the last 2 octets.
When using access lists, it is important where those access lists are placed. Which statement best describes access list placement?
* Put standard access lists as near the destination as possible. Put extended access lists as close to the source as possible.
* Put extended access lists as near the destination as possible. Put standard access lists as close to the source as possible.
* It isn’t import where access lists are placed since the router will read and cache the whole list.
* Put access lists as close to corporate headquarters as possible.
Correct answer: A
Put standard access lists as near the destination as possible. Put extended access lists as close to the source as possible. Standard access lists don’t specify the destination address.
As the system administrator, you enter the following commands at the command prompt:
ipx routing
access-list 800 permit 2b 4d
int e0
ipx network 4d
ipx access-group 800 out
int e1
ipx network 2b
int e2
ipx network 3c
What did these command accomplish?
* Traffic from network 4c destined for network 4d will be forwarded out Ethernet0.
* Traffic from network 3c destined for network 4d will be forwarded out Ethernet0.
* Traffic from network 2b destined for network 4d will be forwarded out Ethernet0.
* Traffic from network 4d destined for network 2d will be forwarded out Ethernet0.
Correct answer: C
Traffic from network 2b destined for network 4d will be forwarded out Ethernet0. The other interfaces E1 and E2 are not subject to the access list since they lack the access group statement to link them to access list 800.
The following commands were entered at the command prompt of a Cisco router. What do they accomplish?
access-list 1000 deny 9e.1234.5678.1212 4
access-list 1000 permit -1
interface ethernet 0
ipx network 9e
interface ethernet 1
ipx network 4a
interface serial 0
ipx network 1
ipx output-sap-filter 1000
* File server advertisements from server 9e.1234.5678.1212 will not be forwarded on interface S0.
* All other SAP services, other than file server, from any source will be forwarded on S0.
* All other SAP services, other than print server, from any source will be forwarded on S0.
* Print server advertisements from server 9e.1234.5678.1212 will not be forwarded on interface S0.
Correct answer: A & B
File server advertisements from server 9e.1234.5678.1212 will not be forwarded on interface S0. All other SAP services, other than file server, from any source will be forwarded on S0.
You receive “input filter list is 800 and output filter list is 801″ as part of the output from a show interfaces command. What kind of traffic are you filtering?
* IPX/SPX
* TCP/IP
* LocalTalk
* DDR
Correct answer: A
Because the access list is numbered in the 800 range, you are filtering IPX/SPX traffic.
Which service uses telephone control messages and signals between the transfer points along the way to the called destination?
* Signaling System 7 (SS7)
* Time-division Multiplexing (TDM)
* X.25
* Frame relay
Correct answer: A
Signaling System 7 (SS7) uses telephone control messages and signals between the transfer points along the way to the called destination. Time-division Multiplexing (TDM) has information from multiple sources and allocates bandwidth on a single media. Circuit switching uses signaling to determine the call route, which is a dedicated path between the sender and the receiver. Basic telephone service and Integrated Services Digital Network (ISDN) use TDM circuits. X.25 and Frame Relay services have information contained in packets or frames to share non-dedicated bandwidth. X.25 avoids delays for call setup. Frame Relay uses permanent virtual circuits (PVCs).
Which service takes information from multiple sources and allocates bandwidth on a single media?
* Time-division Multiplexing (TDM)
* Signaling System 7 (SS7)
* X.25
* Frame relay
Correct answer: A
Which three devices can be used to convert the user data from the DTE into a form acceptable to the WAN service’s facility?
* Modem
* CSU/DSU
* TA/NT1
* CO
* SS7
Correct answer: A, B & C
A modem, CSU/DSU (Channel Service Unit/Data Service Unit), or TA/NT1 (Terminal Adapter/Network Termination 1) can be used to convert the user data from the DTE into a form acceptable to the WAN service’s facility.
What is the juncture at which the CPE ends and the local loop portion of the service begins?
* Demarc
* CO
* Local loop
* Last-mile
Correct answer: A
The demarcation or demarc is the juncture at which the CPE ends and the local loop portion of the service begins. The CO (Central Office) is the nearest point of presence for the provider’s WAN service. The local loop or “last-mile” is the cabling that extends from the demarc into the WAN service provider’s central office.
You can access three forms of WAN services with Cisco routers. Select the three forms:
* Switched or relayed services
* Interface front end to IBM enterprise data center computers
* Using protocols that connect peer-to-peer devices like HDLC or PPP encapsulation.
* IPX/SPX
* NetBEUI
Correct answer: A, B & C
You can access three forms of WAN services with Cisco routers. Switched or relayed services include X.25, Frame Relay, and ISDN. An interface front end to IBM enterprise data center computers includes SDLC. And, you can access the services of WAN providers using protocols that connect peer devices such as HDLC and PPP encapsulation. IPX/SPX and NetBEUI are LAN protocols.
Select the fields for the Cisco HDLC protocol:
* Flag, Address, Control
* Flag, Address, Control, Protocol, LCP (Code, Identifier, Length, Data), FCS, Flag
* Flag, Address, Control, Data, FCS, Flag
* Flag, Address, Control, Proprietary, Data, FCS, Flag
Correct answer: D
The Cisco HDLC frame format is Flag, Address, Control Proprietary, Data, FCS, Flag. The PPP frame format is Flag, Address, Control, Protocol, LCP (Code, Identifier, Length, Data), FCS, Flag. The SDLC and LAPB format is Flag, Address, Control, Data, FCS, Flag.
85: Select the physical interfaces that PPP can be configured on a Cisco router:
* Asynchronous serial
* HSSI
* ISDN
* Synchronous serial
Correct answer: A, B, C & D
All four of them can carry PPP traffic. HSSI is High Speed Serial Interface.
Select the correct statements about PPP and SLIP for WAN communications?
* PPP uses its Network Control Programs (NCPs) component to encapsulate multiple protocols.
* PPP can only transport TCP/IP
* SLIP can only transport TCP/IP.
* SLIP uses its Network Control Programs (NCPs) component to encapsulate multiple protocols.
Correct answer: A & C
87a Which protocol for PPP LCP (Link Control Protocol) performs a challenge handshake?
* CHAP
* PAP
* UDP
* IPX
Correct answer: A
87b Which form of PPP error detection on Cisco routers monitors data dropped on a link?
* Quality
* Magic Number
* Error Monitor
* Droplink
Correct answer: A
The Quality protocol monitors data dropped on a link. Magic Number avoids frame looping.
Which protocol for PPP provides load balancing across multiple links?
* Multilink Protocol (MP)
* Quality
* Magic Number
* Stacker
* Predictor
Correct answer: A
As the system administrator, you type “ppp authentication chap pap secret”. Which authentication method is used first in setting up a session?
* secret
* PAP
* CHAP
* PPP/SLIP
Correct answer: C
Select the compression protocols for PPP?
* Stac
* Predictor
* Quality
* Magic Number
Correct answer: A & B
What are the three phases of PPP session establishment?
* Link establishment phase
* Authentication phase
* Network layer protocol phase
* Handshake phase
* Dial-in phase
Correct answer: A, B & C
What is the default IPX Ethernet encapsulation?
* SNAP
* Arpa
* 802.2
* Novell-Ether
* SAP
Correct answer: D
What must be true for two Routers running IGRP to communicate their routes?
* Same autonomous system number
* Connected using Ethernet only
* Use composite metric
D)Configured for PPP
Correct answer: A
The following is partial output from a routing table, identify the 2 numbers in the square brackets; ‘192.168.10.0 [100/1300] via 10.1.0.1, 00:00:23, Ethernet1′
* 100 = metric, 1300 = administrative distance
* 100 = administrative distance, 1300 = hop count
* 100 = administrative distance, 1300 = metric
* 100 = hop count, 1300 = metric
Correct answer: C
Identify 3 methods used to prevent routing loops?
* Split horizon
* Holddown timers
* Poison reverse
* SPF algorithm
* LSP’s
Correct answer: A B C