Refer to the exhibit.
Host A pings interface S0/0 on router 3.
What is the TTL value for that ping?
A. 252
B. 253
C. 254
D. 255
Answer: B
Explanation:
From the CCNA ICND2 Exam book: ° Rout er s decr e ment t he TTL by 1 ever yti e they forward a packet; if
a router decrements the TTL to 0, it throws away the packet. This prevents packets from rotating forever. ±
I want to make it clear that before the router forwards a packet, the TTL is still remain the same.
For example in the topology above, pings to S0/1 and S0/0 of Router 2 have the same TTL. The picture
below shows TTL values for each interface of each router and for Host B.
Notice that Host A initializes ICMP packet with a TTL of 255:
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