1000 CCNA Interview Questions Answers2

24 In the command "router igrp 109" what does 109 signify?

•     A. an autonomous system

•     B. any network number which the router is attached to

•     C. the allowable length of the routing table

•     D. the network socket number

Ans 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.

25 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?

•     A. unequal-cost load balancing

•     B. equal-cost load balancing

•     C. proportionate load balancing

•     D. low cost load balancing

Ans 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 underutilized links to increase bandwidth and network availability.

26 IGRP uses flash updates, poison reverse updates, holddown times, and split horizon. How often does it broadcast its routing table updates?

•     A. 90 seconds

•     B. 10 seconds

•     C. 30 seconds

•     D. 45 seconds

Ans A

27 The command "show IP protocol" displays which information?

•     A. routing timers

•     B. network information

•     C. contents of the IP routing table

•     D. information about all known network and subnetworks

Ans 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.

28 When using RIP, routing updates are broadcast every           seconds.

•     A. 30

•     B. 10

•     C. 60

•     D. 90

Ans: 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.

29 An autonomous system can only exist if all routers in that system meet which criteria?

•     A. interconnected

•     B. run the same routing protocol

•     C. assigned same autonomous system number

•     D. run IGRP only

•     E. run RIP only

Ans 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.

30 A default route is analogous to a                   .

•     A. default gateway

•     B. static route

•     C. dynamic route

•     D. one-way route

Ans: 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.

31 Routers can learn about destinations through static routes, default, or dynamic routing. By default, a router will use information derived from                                                           .

•     A. IGRP

•     B. RIP

•     C. IP

•     D. TCP Ans 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.

32 You are logged into a router, what command would show you the IP addresses of routers connected to you?

•     A. show cdp neighbors detail

•     B. show run

•     C. show neighbors

•     D. show cdp

Ans A

33 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.

•     A. This lets the router fragment the packet.

•     B. It tells the router not to fragment the packet.

•     C. This lets the router direct the packet to the destination it finds in its routing table.

•     D. It tell the router to send the packet to the next hop router

Ans 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.

34 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:

.!!!!