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

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相关考题

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

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

单项选择题

网络管理员在交换机1上创建一个新VLAN并且将主机C和主机D加入到此VLAN中。管理员配置交换机接口FastEthernet0/13到FastEthernet0/24成为新VLAN成员.但是网络管理员完成配置以后，主机A可以和主机B通信，但是主机A不能和主机C或者主机D通信。哪个命令可以用来解决这个问题？（）

A.
B.
C.
D.