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
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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.
