Refer to the exhibit. Host A pings interface S0/0 on router 3. What is the TTL value for that ping?

The correct answer is B. 253. The default TTL for a ping packet sent by a Cisco device or a standard host is 255. Each router that FORWARDS (routes) the packet decrements the TTL by 1. In the exhibit, the path from Host A to R3's S0/0 traverses two intermediate routers (e.g., R1 and R2): R1 decrements TTL fro

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Question

Refer to the exhibit. Host A pings interface S0/0 on router 3. What is the TTL value for that ping?

Options

A252
B253
C254
D255

How the community answered

(15 responses)

A
13% (2)
B
80% (12)
D
7% (1)

Explanation

The default TTL for a ping packet sent by a Cisco device or a standard host is 255. Each router that FORWARDS (routes) the packet decrements the TTL by 1. In the exhibit, the path from Host A to R3's S0/0 traverses two intermediate routers (e.g., R1 and R2): R1 decrements TTL from 255 to 254, and R2 decrements it from 254 to 253. When the packet arrives at R3's S0/0, that interface IS the destination - R3 does not decrement the TTL again because it is not forwarding the packet onward. Therefore the TTL value received at S0/0 is 253. A value of 252 would imply 3 hops; 254 would imply only 1 hop; 255 would mean no hops at all.

Topics

#TTL#ICMP ping#hop count#IP header

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