单项选择题

关于流行性感冒下列哪项是错误的（）

A.甲型流感易发生变异
B.由流行性感冒病毒引起
C.临床表现以上呼吸道症状较重
D.发热及全身中毒症状较重

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多项选择题

What are the two reasons for the appearance of 0.0.0.0 as the next hop for a network in the show ip bgp command output？（）

A.The network was originated via redistribution of an interior gateway protocol into BGP
B.The network was defined by a static route
C.The network was originated via a network or aggregate command
D.The network was learned via EBGP
E.The network was learned via IBGP

单项选择题

In which NAS operating mode are ACL filtering and bandwidth throttling only provided during posture assessment？（）

A. Layer 2
B. Layer 3
C. in-band
D. out-of-band
E. edge
F. central