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Implementing and Operating Cisco Enterprise Network Core Technologies (ENCOR) · Cisco
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without DF set the packet will arrive fragmented
C is correct
No MTU command needs to be run on the tunnel interface. When building a GRE tunnel the MTU on the tunnel interface is automatically decreased by 24 bytes to account for the overhead of the GRE header and new IP header. With physical interfaces set at 1500 there should be no fragmentation on a 1500 byte packet. https://community.cisco.com/t5/networking-knowledge-base/gre-tunnel-mtu-interface-mtu-and-fragmentation/ta-p/3673508