單項(xiàng)選擇題During the modem boot process，how does the modem acquire the downstream channel？（）

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


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2.單項(xiàng)選擇題What is the effect of changing DMT interleaved delay from 3 milliseconds to 15 milliseconds？（）

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.

3.單項(xiàng)選擇題When gateways are registering with a gatekeeper， the gatekeeper can be（）.

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

4.單項(xiàng)選擇題What is the relationship between the Domain Name System （DNS） and LDAP？（）

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.

5.多項(xiàng)選擇題The OSPF External LSA for prefix x.x.x.x exists in the OSPF database， but the prefix is not installed in therouting table. Which are possible explanations？（）

A.Inbound distribute-list is configured under the ospf process and it is denying x.x.x.x
B.ASBR origination the LSA is not reachable
C.Route to the Forwarding Address in not an internal OSPF route
D.Route to the Forwarding Address is an internal OSPF route
E.Route to the ASBR does not follow the same path as the one to the Forwarding Address