How many bytes of overhead does an IP-IP tunnel add to a packet?

How many bytes of overhead does an IP-IP tunnel add to a packet?
A . 24 bytes
B . 28 bytes
C . 20 bytes
D . 14 bytes

View Answer

Answer: C

Explanation:

Difference Between GRE and IP-IP Tunnel. Generic Routing Encapsulation (GRE) and IP-in-IP (IPIP) are two rather similar tunneling mechanisms which are often confused. In terms of less overhead, the GRE header is 24 bytes and an IP header is 20 bytes.

Reference: https://www.knowledgebombs.net/blog/2012/08/01/wireshark-ipip-capture-filter.html