Spanning Tree Protocol (STP) Interview Question:

Tell us why there are two length fields (IP header length, IP datagram length) in the IP header?

Submitted by: Administrator

The size of the IP header is not fixed. Depending on the IP options present, the size of the IP header will vary. A separate field for the IP header length is added, so that the destination system can separate the IP datagram header from the payload.
Submitted by: Administrator