单项选择题

What is the function of the AJB bits on DS1 using Extended Super Frame （ESF）？（）

A.It is used for signaling on-hook and off-hook status
B.It carries CRC information for error detection
C.It is used for a control and performance information
D.It is used for a frame’s synchronization and alignment

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热门试题

单项选择题Duringthemodembootprocess，howdoesthemodemacquirethedownstreamchannel？（）

A.The modem is commanded by the CMTS to set to the specific channel
B.The modem uses the default value in the broadcom chipset
C.The modem tuner sets a level as defined by the DOCSIS specification
D.The modem tuner scans the downstream spectrum until digital QAM modulated signal is encountered

单项选择题WhatprotocoldoesanIPphoneusetolearnthevoiceVLANIDitshoulduseforvoicetraffic？（）

A.VTP
B.802.1 q
C.CDP
D.Skinny Station Protocol

单项选择题WhatistheeffectofchangingDMTinterleaveddelayfrom3millisecondsto15milliseconds？（）

A.Latency remains the same， but throughput is decreased.
B.Latency remains the same， but error correction effectives may also be reduced.
C.Latency is increased， but faster error correction occurs.
D.Fewer ATM PVCs can be provisioned on DSL line.

单项选择题Whengatewaysareregisteringwithagatekeeper，thegatekeepercanbe（）.

A.On the same subnet
B.On a remote LAN
C.In a different subnet
D.Any of the above

单项选择题WhatistherelationshipbetweentheDomainNameSystem（DNS）andLDAP？（）

A.All the root DNS servers maintain information in a distributed LDAP tree.
B.DNS clients access DNS information by making LDAP queries to DNS servers.
C.An LDAP DN attribute is a Domain Name.
D.It is currently recommended to express DN as a sequence of Domain components.