As　they　access　the　corporate　network,　mobile　and　remote　users　inadvertently　can　infect　the　network　with(72)and　worms　acquired　from　unprotected　public　networks。

单项选择题Because Web Servers are platform and application(74)they can send or request data from legacy or external applications including databases。

单项选择题下列网络互连设备中，属于物理层的是( )。