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When using Generic Routing Encapsulation (GRE) tunneling over Internet Protocol version 4 (IPv4), where is the GRE header inserted?
Correct Answer: B
Generic Routing Encapsulation (GRE) is a protocol that encapsulates a packet of one protocol type within another protocol type4. When using GRE tunneling over IPv4, the GRE header is inserted between the delivery header and the payload5. The delivery header contains the new source and destination IP addresses of the tunnel endpoints, while the payload contains the original IP packet4. The GRE header contains information such as protocol type, checksum, and key6.