问答题
（1）use GRE tunnels to carry ipv6&en......
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whenyouuseLSAtype4inOSPFenvironment？
问答题when you use LSA type 4 in OSPF environment？
hyyouuseSpanning-tree？DifferencebetweenPVST&MST.
问答题hy you use Spanning-tree？ Difference between PVST & MST.
whatisthedifferencebetweentheHSRPandVRRP？
问答题what is the difference between the HSRP and VRRP？
