单项选择题
A.Tag Calling Interface B.Tag Control Identifier C.ToS Class Interface D.Tag Control Information
Inwhichmodesdoesselectivepacketdiscard（SPD）operate？（）A....
多项选择题In which modes does selective packet discard（SPD）operate？（）
A.normal B.discard C.random D. full
WhichtwostatementsaboutVPLSaretrue？（）A.There is a 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.
IntheApacheWebServerconfiguration，thecommandKeepAliveON...
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
