Question
On the topic of OSPF routing; which of the following are the traits of an OSPF area? (Select all that apply)

A. Each OSPF area requires a loopback interface to be configured.


B. Areas may be assigned any number from 0 to 65535.


C. Area 0 is called the backbone area.


D. Hierarchical OSPF networks do not require multiple areas.


E. Multiple OSPF areas must connect to area 0.


F. Single area OSPF networks must be configured in area 1.
Answers
C, E
Explanation: OPSF uses areas in a hierarchical fashion, and the backbone area is always area 0. All other areas have at least one connection to area 0.

Incorrect Answers:


A. Loopback interfaces are often used in OSPF networks, so that the router ID can be configured. However, this is not a requirement.

B. The area-id can be an integer between 0 and 4294967295.


F. Single area OSPF networks do not have to be configured with the backbone area 0. Although area 1 can indeed be used, it is not required that area 1 is used. Single area OSPF networks can be any integer from 0-4294967295.   Your Comment




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