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Refer to Exhibit. MTU has been configured on the underlying physical topology, and no MTU command has been configured on the tunnel interfaces. What happens when a 1500-bye IPv4 packet traverses the GRE tunnel from host X to host Y, assuming the DF bit is cleared?
Correct Answer: D
GRE is 20 IP Header Bytes and 4 GRE Header Bytes and another 4 Bytes if a Tunnel key is used. 1500 + 28 > 1500 so the packet has to be fragmented to traverse the ethernet having a Maximum Transmission Unit of 1500 Bytes. If the DF bit was set, the packet would be discarded.