what is the TTL value for that ping?

Refer to the exhibit.

Host A pings interface S0/0 on router 3, what is the TTL value for that ping?

A.
253

B.
252

C.
255

D.
254

Explanation:
From the CCNA ICND2 Exam book: “Routers decrement the TTL by 1 every time 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: