A.They run a spell check on host names to ensure accurate routing
B.They convert domain names into IP address
C.Given an IP address,they determine the name of the host that is sought
D.They map individual hosts to their specific IP addresses

A.It designates VLAN 999 for untagged traffic.
B.It blocks VLAN 999 traffic from passing on the trunk.
C.It creates a VLAN 999 interface.
D.It designates VLAN 999 as the default for all unkown tagged traffic.

A.源MAC地址
B.源IP地址
C.源交换机端口
D.目的地IP地址
E.目标端口地址
F.目的MAC地址

A.10.10.0.0/18 subnetted with mask 255.255.255.252
B.10.10.0.0/25 subnetted with mask 255.255.255.252
C.10.10.0.0/24 subnetted with mask 255.255.255.252
D.10.10.0.0/23 subnetted with mask 255.255.255.252
E.10.10.0.0/16 subnetted with mask 255.255.255.252

A.数据链路
B.网络
C.物理
D.传输

A.SW1#show swithport port-security interface FastEthernet 0/12
B.SW1# show swithport port-secure interface FastEthernet 0/12
C.SW1# show port-secure interface FastEthernet 0/12
D.SW1#show running-config
E.SW1#show port-security interface FastEthernet 0/12

A.最低端口MAC地址
B.端口的优先级号和MAC地址
C.VTP修订号
D.最高的端口优先级数量
E.路径开销（cost）

A.RSTP链路故障后显著减少拓扑聚合时间
B.RSTP通过增加备用和备份角色的消费STP端口角色
C.RSTP端口atates被阻塞，丢弃，learing，或转发
D.RSTP还使用STP proprsal-协议序列
E.RSTP使用相同的定时器baseed过程STP上点至点链接
F.在点到点链路提供比STP更快的传输和转发

A.VTP
B.802.1Q
C.RSTP
D.STP

A.Port security needs to be globally enabled.
B.Port security needs to be enabled on the interface.
C.Port security needs to be configured to shut down the interface in the event of a violation.
D.Port security needs to be configured to allow only one learned MAC address.
E.Port security interface counters need to be cleared before using the show command.
F.The port security configuration needs to be saved to NVRAM before it can become active.