CCNA640-802 V13题库试题分析22艾迪飞吴老师讲解)

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CCNA640-802 V13题库试题分析21(艾迪飞吴老师讲解)
1．At which layers of the OSI model do WANs operate? (Choose two.)

A. application layer

B. session layer

C. transport layer

D. network layer

E. datalink layer

F. physical layer

Answer: EF

解释一下：WAN是工作在一层和二层的，比如现在常用的Frame-relay,ATM等这些都是工作在OSI的二层的。





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2．A network administrator wants to ensure that only the server can connect to port Fa0/1 on a Catalyst switch. The server is plugged into the switch Fa0/1 port and the network administrator is about to bring the server online. What can the administrator do to ensure that only the MAC address of the server is allowed by switch port Fa0/1?

(Choose two.)

A. Configure port Fa0/1 to accept connections only from the static IP address of the server.

B. Employ a proprietary connector type on Fa0/1 that is incompatible with other host connectors.

C. Configure the MAC address of the server as a static entry associated with port Fa0/1.

D. Bind the IP address of the server to its MAC address on the switch to prevent other hosts from spoofing the server IP address.

E. Configure port security on Fa0/1 to reject traffic with a source MAC address other than that of the server.

F. Configure an access list on the switch to deny server traffic from entering any port other than Fa0/1.

Answer: CE

解释一下：交换机的f0/1端口上仅仅允许转发server的流量，因此我们可以配置将server的mac地址和交换机的端口进行绑定。然后用在端口f0/1上配置端口安全以过滤其他除server外的流量。









3．Refer to the exhibit. A network associate has configured the internetwork that is shown in the exhibit, but has failed to configure routing properly. Which configuration will allow the hosts on the Branch LAN to access resources on the HQ LAN with the least impact on router processing and WAN bandwidth?

  

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A. HQ(config)# ip route 192.168.1.0 255.255.255.0 192.168.2.5

Branch(config)# ip route 172.16.25.0 255.255.255.0 192.168.2.6

B. HQ(config)# router rip

HQ(config-router)# network 192.168.2.0

HQ(config-router)# network 172.16.0.0

Branch(config)# router rip

Branch (config-router)# network 192.168.1.0

Branch (config-router)# network 192.168.2.0

C. HQ(config)# router eigrp 56

HQ(config-router)# network 192.168.2.4

HQ(config-router)# network 172.16.25.0

Branch(config)# router eigrp 56

Branch (config-router)# network 192.168.1.0

Branch (config-router)# network 192.168.2.4

D. HQ(config)# router ospf 1

HQ(config-router)# network 192.168.2.4 0.0.0.3 area 0

HQ(config-router)# network 172.16.25.0 0.0.0.255 area 0

Branch(config)# router ospf 1

Branch (config-router)# network 192.168.1.0 0.0.0.255 area 0

Branch (config-router)# network 192.168.2.4 0.0.0.3 area 0

Answer: A

解释一下：动态路由协议都是需要有他的更新包来传递路由的，而这些都是会占用带宽的，为了减小流量的冲突我们可以采用静态路由，他是会占用任何带宽的。





4．Which are valid modes for a switch port used as a VLAN trunk? (Choose three.)

A. transparent

B. auto

C. on

D. desirable

E. blocking

F. forwarding

Answer: BCD

解释一下：将链路配置为trunk模式可以通过几种协商模式来完成：auto , desirable , on ;也可以通过静态指定trunk来强制一条链路为trunk。





5．Refer to the exhibit. The network administrator is in a campus building distant from Building B. WANRouter is hosting a newly installed WAN link on interface S0/0. The new link is not functioning and the administrate needs to determine if the correct cable has been attached to the S0/0 interface. How can the administrator accurately verify the correct cable type on S0/0 in the most efficient manner?

     

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A. Telnet to WANRouter and execute the command show interfaces S0/0

B. Telnet to WANRouter and execute the command show processes S0/0

C. Telnet to WANRouter and execute the command show running-configuration

D. Telnet to WANRouter and execute the command show controller S0/0

E. Physically examine the cable between WANRouter S0/0 and the DCE.

F. Establish a console session on WANRouter and execute the command show interfaces S0/0

Answer: D

解释一下：要检验端口s0/0的线缆类型，首先要登陆到路由器上去，我们可以通过telnet的技术登上去，查看接口所接的线缆的类型使用的命令为show controller s0/0,可以看到接口的状态为DTE，或是DCE。

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5．What is the function of the command switchport trunk native vlan 999 on a Cisco Catalyst switch?

A. It creates a VLAN 999 interface.

B. It designates VLAN 999 for untagged traffic.

C. It blocks VLAN 999 traffic from passing on the trunk.

D. It designates VLAN 999 as the default for all unknown tagged traffic.

Answer: B

解释一下：native vlan是不打标签的VLAN，这指定native vlan 为999，表明 VLAN 999为不用打标签的VLAN.

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thanks<br>试题分析

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