单项选择题

What is TCI？（）

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

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多项选择题

In which modes does selective packet discard（SPD）operate？（）

A.normal
B.discard
C.random
D. full

多项选择题

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.

单项选择题

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