单项选择题switchport trunk native vlan 999 这个命令起什么作用?()

A.它指定VLAN999转发未做标记的流量。
B.它阻止VLAN999转发主干的流量。
C.它创建了一个VLAN999接口。
D.它指定VLAN999作为默认为所有未知标记的流量。


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1.单项选择题which command allows you to verify the encapsulation type (CISCO OR IETF) for a frame relay link?()

A.show frame-relay map
B.show frame-relay lmi
C.show inter serial
D.show frame-relay pvc

2.单项选择题

根据下图,Switch-1需要往一台MAC地址为00b0.d056.efa4的主机发数据,Switch-1会如何处理这些数据?()

A.(Switch-1会丢弃该数据,因为它没有该MAC地址条目)
B.(Switch-1会泛洪该数据到所有的接口,除了该数据的源接口)
C.(Switch-1会发送ARP请求到所有的接口,除了该数据的源接口)
D.(Switch-1会往默认网关发送该数据)

3.单项选择题What is the alternative notation for the IPV6 address B514:82C3:0000:0000:0029:EC7A:0000:EC72?()

A.B514:82C3:0029::EC7A:0000:EC72
B.B514:82C3:0029:EC7A:EC72
C.B514:82C3::0029:EC7A:0:EC72
D.B514:82C3::0029:EC7A:EC72

4.单项选择题DNS servers provide what service?()

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

5.单项选择题What is the function of the command switchport trunk native vlan 999 on a switch?()

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.

6.单项选择题什么存储第2层交换机使用,以决定在哪里转发接收到的帧?()

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

7.单项选择题The network administrator is asked to configure 113 point-to-point links.Which IP addressing scheme best defines the address range and subnet mask that meet the requirement and waste the fewest subnet and host addresses?()

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

8.单项选择题在OSI模型的哪层运用RSTP用来防止循环?()

A.数据链路
B.网络
C.物理
D.传输

9.多项选择题Which two commands correctly verify whether port security has been configured on port FastEthernet 0/12 on a switch?()

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

10.单项选择题选举根端口主要确定哪个值?()

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)