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

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. 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, D, 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. If, for some reason, any area does not have a direct connection to the backbone area 0, then an OSPF virtual link must be configured. OSPF networks do not require multiple areas, as all routers can be contained within a single area. If an OSPF network is configured as a single area, then area 0 does not need to be used.
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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