Explanation:
GRE (Generic Routing Encapsulation) adds a fixed overhead of 24 bytes, which includes a 4-byte GRE header and a 20-byte IP header. Thus, while C is somewhat misleading in its specific wording, it is generally accepted that the total overhead when encapsulating an IP packet is 24 bytes.
Other Options:
A: The TTL field in the GRE tunnel payload is not decremented by routers.
B and D: GRE tunnels support encapsulating both IP and non-IP traffic.
A. The time-to-live field in the tunnel payload is decremented during transit.
Explanation:
GRE (Generic Routing Encapsulation) is a protocol that can encapsulate a wide variety of network layer protocols inside virtual point-to-point connections. When traffic is sent through a GRE tunnel, the TTL (Time to Live) of the original IP packet inside the GRE payload is decremented as the packet traverses the tunnel.
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