Chapter 8 Solutions
Review Questions
1. What command injects a default route into an OSPF network?
2. Classless routing protocols carry subnet mask information in their routing table updates. True or False?
3. The process ID must match on all routers in an OSPF network. True or False?
4. What command switches RIP to version 2?
5. What command turns off automatic summarization to major network boundaries in both RIPv2 and
EIGRP?
6. In what state are OSPF neighbors, when bidirectional communication has been established and
adjacencies have been formed?
7. Which type of authentication sends only a hash across the link between two authenticating peers?
8. What command places the 192.168.12.32/27 network into OSPF area 0?
9. EIGRP uses the same metric as IGRP multiplied by _________256____.
10. What feature of OSPF allows it to use a hierarchical design?
11. Cisco routers can be configured to send and receive RIPv1 updates on a per-interface basis. True or
False?
12. What does the feasibility condition state? RD < FD = feasible successor
13. What protocol is used by EIGRP to transport its routing protocol information?
14. Which of the following commands enables EIGRP on a router with an autonomous system number of
101?
15. What algorithm is used by OSPF for path selection?
19. Which of the following commands would ensure that a router becomes the DR on a broadcast,
multiaccess network?
20. What command displays the successors and feasible successors for EIGRP?
21. What command displays area authentication information?
24. Which of the following is used by EIGRP for path determination?
25. What is the default OSPF cost for FastEthernet (assuming the default reference bandwidth)?
a. 40
Case Projects
Case Projects
Case Project 1
In the small network at Hogan Enterprises, it is not necessary to abandon RIP in order to implement VLSM. If the
company wants to implement a VLSM scheme with the least amount of di ruption, it can convert the network to
RIP version 2 using the no auto-summary command. Additionally, RIPv2 supports authentication so the company
Case Project 2
EIGRP has the following characteristics:
• Distance-vector protocol that uses some link-state features
• Event triggered updates
• Fast convergence
• Cisco Proprietary
• Easy to configure
• Automatic redistribution into IGRP
OSPF has the following characteristics:
• Link-state routing protocol
• Event triggered updates
Conner, Inc. must be running a network of all Cisco routers or it would not be able to run the Cisco proprietary
protocol IGRP. Therefore, the company can choose to run EIGRP or OSPF. The main advantage EIGRP has
over OSPF in this scenario is its ability to automatically redistribute IGRP. Due to this feature, the network can be
upgraded in a piecemeal fashion very easily. If you use OSPF, more complex redistribution commands would be
necessary. Of course, OSPF has the advantage of allowing areas to be created to control routing traffic. So, the
Case Project 3
Student should discuss OSPF authentication and then show a printout of commands such as the following:
RouterA(config)#int s0/3/0
RouterA(config-if)#ip ospf message-digest-key 1 md5 secureme
RouterB(config)#router ospf 1
RouterB(config-router)#area 0 authentication message-digest