A.They are always present in the NATt able.
B.They allow connection to be initiated from the outside.
C.They can be configured with access lists，to allow two or more connections to be initiated from the outside.
D.They require no inside or outside interface markings because addresses are statically defined.

A.AH
B.MB5
C.PSK
D.ESP

A.ipv6 address PREFIX_1::1/64
B.ipv6 autoconfig 2001:db8:2222:7272::72/64
C.ipv6 autoconfig
D.ipv6 address 2001:db8:2222:7272::72/64

A.A
B.B
C.C
D.D
E.E
F.F

A.4094
B.1024
C.8190
D.2046
E.4096

A.Broadcast frames are never sent to swiches.
B.Broadcast addresses use an incorrect format for the switching table.
C.A broadcast address will never be the source address of a frame.
D.Broadcasts only use network layer addressing.
E.A broadcast frame is never forwarded by aswitch.

A.#vtp domain unset
B.#delete vlan.dat
C.#no vtp domain
D.#vtp domain null

A.serial 1
B.serial 2
C.logic-channel 2
D.logic-channel 3

A.端口號(hào)小于此數(shù)字的服務(wù)
B.端口號(hào)大于此數(shù)字的服務(wù)
C.端口號(hào)等于此數(shù)字的服務(wù)
D.端口號(hào)不等于此數(shù)字的服務(wù)

A.鏈路空閑時(shí)間
B.忙端口的空閑時(shí)間
C.鏈路斷開時(shí)間
D.端口數(shù)據(jù)可以發(fā)送等待時(shí)間