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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-byte IPv4 packet traverses the GRE tunnel from host X to host Y, assuming the DF bit is cleared?
Correct Answer: A
When a 1500-byte IPv4 packet traverses a GRE tunnel, and the DF (Don't Fragment) bit is cleared, the packet can be fragmented if necessary. However, since the MTU on the physical interfaces underlying the tunnel is set to 1500 bytes and there is no MTU command applied on the tunnel interfaces, the packet will not need to be fragmented. Therefore, it will arrive at router C without fragmentation. References := Implementing and Operating Cisco Service Provider Network Core Technologies source book and official Cisco documentation.