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  3. RIP version 2 is being used as the routing protocol within the Ezonexam network. What does RIP version 2 use to prevent routing

RIP version 2 is being used as the routing protocol within the Ezonexam network. What does RIP version 2 use to prevent routing

admin2009-05-19  65
问题 RIP version 2 is being used as the routing protocol within the Ezonexam network.
What does RIP version 2 use to prevent routing loops? (Choose two)
A. CIDR
B. Split horizon
C. Authentication
D. Classless masking
E. Hold-down timers
F. Multicast routing updates
G. Path Vectoring
选项
答案B,E
解析 Explanation:
Distance Vector routing protocols employ the split horizon mechanism to reduce the possibility of routing loops. Split horizon blocks information about routes from being advertised by a router out of any interface from which that information originated.

RIP versions 1 and 2 also use the concept of hold timers. When a destination has become unreachable (or the metric has increased enough to cause poisoning), the destination goes into "holddown". During this state, no new path will be accepted for the same destination for this amount of time. The hold time indicates how long this state should last.

Incorrect Answers:
A, C, D, F. Although these are all features and functions of RIP version 2, they are not mechanisms used to prevent routing loops.

G. Path Vectoring is a concept used by BGP routers. RIP version 1 and 2 are considered to be distance vector routing protocols.
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