单项选择题
A.traceroute address B.tracert address C.ssh address D.telnet address
出于安全考虑，网络管理员需要去防止外网主机PING内网，下面哪个协议应该用access control lis...
单项选择题出于安全考虑，网络管理员需要去防止外网主机PING内网，下面哪个协议应该用access control lists限制掉？（）
A.IP B.ICMP C.TCP D.UDP
A company has a small network，consisting of a single sw...
单项选择题A company has a small network，consisting of a single switch and a single router. The switch has been configured with two vlans，and route-on-a-stick is being configured on the router for inter-vlan routing. A trunk is configured to connect the switch to the router.What is the minimum number of router subinterfaces that are required for all the vlans to communicate？（）
A.one B.three C.two D.zero
What can a network administrator utilize by using PPP L...
多项选择题What can a network administrator utilize by using PPP Layer 2 encapsulation (Choose three.) （）。
A.VLAN support B.compression C.authentication D.sliding windows E.multilink support F.quality of service
