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2.0 Virtualization

GRE & IPsec Tunnels Practice Questions

GRE tunneling overhead/keepalives and IPsec tunnel protection.

One solved question, so you can see how these are marked

How many additional bytes of overhead does a standard Generic Routing Encapsulation (GRE) header add to an IP packet (excluding outer IP header)?

4 bytes

A standard GRE header is 4 bytes long (plus an additional 20 bytes for the outer IP header, totaling 24 bytes overhead).

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