Skip to content
Related Articles
Open in App
Not now

Related Articles

GATE | GATE-CS-2014-(Set-3) | Question 35

Improve Article
Save Article
  • Difficulty Level : Easy
  • Last Updated : 19 Oct, 2021
Improve Article
Save Article

Host A (on TCP/IP v4 network A) sends an IP datagram D to host B (also on TCP/IP v4 network B). Assume that no error occurred during the transmission of D. When D reaches B, which of the following IP header field(s) may be different from that of the original datagram D?

(i) TTL 
(ii) Checksum 
(iii) Fragment Offset

(A) (i) only
(B) (i) and (ii) only
(C) (ii) and (iii) only
(D) (i), (ii) and (iii)

Answer: (D)

Explanation: All (i), (ii) and (iii) are changed:

(i) TTL is decremented at every hop. So TTL is different from original value

(ii) Since TTL changes, the Checksum of the packet also changes.

(iii) A packet is fragmented if it has a size greater than the Maximum Transmission Unit (MTU) of the network. There may be intermediate networks that may change fragment offset by fragmenting the packet.

Quiz of this Question

My Personal Notes arrow_drop_up
Related Articles

Start Your Coding Journey Now!