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單項選擇題

Which command can be a router to verify the layer 3 path to a host？（）

A.traceroute address
B.tracert address
C.ssh address
D.telnet address

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單項選擇題

出于安全考慮，網(wǎng)絡(luò)管理員需要去防止外網(wǎng)主機PING內(nèi)網(wǎng)，下面哪個協(xié)議應(yīng)該用access control lists限制掉？（）

A.IP
B.ICMP
C.TCP
D.UDP

單項選擇題

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