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单选题
Which one of the WAN data-link protocols below is used for out-of-band signaling?（）
A
HDLC
B
NCP
C
PAP
D
LAPD
E
LAPB
F
None of the above
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单选题Which one of the WAN data-link protocols below is used for out-of-band signaling?（）A
HDLCB
NCPC
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LAPDE
LAPBF
None of the above
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IGRPD
CDPE
VTP
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pstatC
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Reverse ARPC
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Inverse ARPE
indirect ARP
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A VRRP group has one active and one or more standby virtual routers.B
A VRRP group has one master and one or more backup virtual routers.C
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None of the other alternatives apply
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ISDNB
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单选题Which one of the following answer choices below is true regarding the OSPF topology database?（）A
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TCPD
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