單項選擇題ATT （Attached ）bit needs to be set in the link state PDUs in an IS-IS level-1-2 router to indicate that theyare a potential exit point out of the area.（）

A.True
B.False


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1.單項選擇題What is the statistical reserve？（）

A.Bandwidth that is reserved for SVCs to route over a trunk
B.Bandwidth that is reserved on a trunk so that ABR connections can burst
C.Bandwidth on a trunk that is reserved for control traffic and cannot be used by connections
D.Bandwidth that cannot be allocated to connections but can be used to accommodate statistical variations in the traffic

2.單項選擇題What is TCI？（）

A.Tag Calling Interface
B.Tag Control Identifier
C.ToS Class Interface
D.Tag Control Information

3.多項選擇題In which modes does selective packet discard（SPD）operate？（）

A.normal
B.discard
C.random
D. full

4.多項選擇題Which two statements about VPLS are true？ （）

A.There is a full mesh of pseudowires.
B.There is a partial mesh of pseudowires.
C.Only L2TPv3 can be used for pseudowire establishment.
D.There is split-horizon to avoid loops.

5.單項選擇題In the Apache Web Server configuration， the command KeepAlive ON is used to（）

A.Allow a CSS to probe the server
B.Allow a connection to be closed with a TCP RESET
C.Allow persistent connections
D.Allow the use of HTTP HEAD request