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單項(xiàng)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(jī)PING內(nèi)網(wǎng)，下面哪個(gè)協(xié)議應(yīng)該用access control lists限制掉？（）

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

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單項(xiàng)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

多項(xiàng)選擇題

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