多项选择题

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

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

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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

多项选择题

Which of the following is reported in the LMI regular status polling？（）

A.Addition or Deletion of PVC
B.PVC status （active or inactive）
C.Link integrity
D.None of the other alternatives apply