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How many bytes does IP-IP tunneling add to an IP packet?
Correct Answer: A
Explanation/Reference: Tunneling increases overhead, because it needs an extra set of IP headers. Typically this is 20 bytes per packet, so if the normal packet size (MTU) on a network is 1500 bytes, a packet that is sent through a tunnel can only be 1480 bytes big. References: http://cs.uccs.edu/~scold/iptunnel.htm