问题:
A . GRE can use transport mode and save up to twenty bytes per packet.
B . The corporate network includes many discontinuous blocks of IP networks and requires split tunneling.
C . The corporation's primary application is based on IP multicast.
D . Without GRE, there is no means to detect a head-end failure.
E . GRE would enable path MTU discovery.
● 参考解析
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