Refer to the exhibit. After a RIP route is marked invalid on Router_1, how much time will elapse before that route is removed from the routing table?
A. 30 seconds
B. 60 seconds
C. 90 seconds
D. 180 seconds
E. 240 seconds
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The question reads: After a RIP route marked invalid on Router_1, how much time will elasped before that route is removed from the routing table.
The correct answer is B.
The word “REMOVED” in the question means “FLUSHED.” Carefully look at the Router_1 show ip protocol output:
Invalid is 180 secs.
Flushed is 240secs.
RIP route marked invalid (180secs.)…Time elapsed before route is removed (Flushed 240secs.)
The difference is 60secs……..240-180=60.
The invalid timer, hold down timer and flush timer start counting at the same time.
You are right!
It’s too simple. Invalid timer and flush timer start at same time. It means 240-180=60
Answer is B.