DsmbISP Chapter 6 - (Version 4.1)

1. What is the purpose of a routing protocol?
*It allows a router to share information about known networks with other routers.

2. Why is fast convergence desirable in networks that use dynamic routing protocols?
*Routers may make incorrect forwarding decisions until the network has converged.

3. In which situation would a company register for its own autonomous system number (ASN)?
*when the company uses two or more ISPs

4. What term refers to a group of networks that uses the same internal routing policies and is controlled by a single administrative authority?
*autonomous system

5. Which protocol is an exterior routing protocol?

6. What device enables an ISP to connect with other ISPs to transfer data?
*border gateway router

7. Which part of an IP packet does the router use to make routing decisions?
*destination IP address

8. What statement is true regarding an AS number?
*AS numbers are controlled and registered for Internet use.

9. Which routing protocol is used to exchange data between two different ISPs?

10. Consider this routing table entry:

R [120/1] via 00:00:27 Serial0/1

What type of route is this?
*a RIP route

11. Refer to the exhibit. If all routers are running RIP and network goes down, when will R3 learn that the network is no longer available?

12. What information is included in RIPv2 routing updates that is not included in RIPv1 updates?
*subnet mask

13. What two types of businesses would benefit from registering as their own autonomous systems? (Choose two.)
*a global business with connections to multiple local ISPs
*a medium-sized nationwide business with Internet connectivity through different ISPs

14. Which two statements describe static routes? (Choose two.)
*They require manual reconfiguration to accommodate network changes.
*They are identified in the routing table with the prefix S

15. What is the difference between interior and exterior routing protocols?
*Interior routing protocols are used to communicate within a single autonomous system.

16. Refer to the exhibit. Which configuration command or commands contributed to the output that is shown?
*routerA(config-router)# network

17. Refer to the exhibit. All of the routers are running RIP. There are two paths from router A to the network. Based on the output of the show ip route command on router A, which route was entered into the routing table and why?
*A,B,C,D because it has the lowest metric

18. What is the purpose of the network command in configuring RIP?
*to identify the directly connected networks that will be announced in RIP updates

19. Refer to the exhibit. If connectivity between the two hosts is maintained, what is the maximum number of RIP routers that can be in the path from HostA to HostB?

20. Refer to the exhibit. Router B receives a packet with a destination address of What will router B do?
*use the default route


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