GATE | GATE IT 2006 | Question 19

Which of the following statements is TRUE?

 
(A) Both Ethernet frame and IP packet include checksum fields
(B) Ethernet frame includes a checksum field and IP packet includes a CRC field
(C) Ethernet frame includes a CRC field and IP packet includes a checksum field
(D) Both Ethernet frame and IP packet include CRC fields


Answer: (C)

Explanation:  

ETHERNET FRAME FORMAT:

1. It also called IEEE 802.3 protocol.
2. Used at data link layer, bus topology, CSMA/CD access control, NO acknowledgement used.
3. For securing CRC is used, more precisely, CRC-32 bit.

IP DATAGRAM FORMAT:


IP datagram uses 16-bit checksum.

So, ETHERNET->CRC and IP->checksum.

This solution is contributed by Sandeep pandey.

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