7
b. 62
c. 126
d. 252
17. How many hosts can be addressed with a pre?¬?x of /30?
a. 1
b. 2
c. 4
d. 30
Review Questions 137
18. Which subnet mask would be appropriate for a Class C address used for 9 LANs, each with
12 hosts?
a. 255.255.255.0
b. 255.255.255.224
c. 255.255.255.240
d. 255.255.255.252
19. How can you most effectively summarize the IP range of addresses from 10.1.32.0 to
10.1.35.255?
a. 10.1.32.0/23
b. 10.1.32.0/22
c. 10.1.32.0/21
d. 10.1.32.0/20
20. How can you most effectively summarize the IP range of addresses from 172.168.12.0/24 to
172.168.13.0/24?
a. 172.168.12.0/23
b. 172.168.12.0/22
c. 172.168.12.0/21
d. 172.168.12.0/20
This chapter includes the
following sections:
?– Chapter Objectives
?– Introducing OSPF
?– Troubleshooting OSPF
?– Chapter Summary
?– Review Questions
C H A P T E R 4
Single-Area OSPF
Implementation
This chapter examines Open Shortest Path First (OSPF), which is one of the most commonly
used Interior Gateway Protocols (IGPs) in IP networking. OSPF is an open-standard, classless
IGP. OSPF is based primarily on RFC 2328 and is designated by the Internet Engineering Task
Force (IETF) as one of several IGPs.
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