正确答案: B

生成树协议

题目：为了阻止交换机环路，交换机上所采用的技术为（）

解析：B

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举一反三的答案和解析：

[单选题]The Ezonexam network administrator needs to a switch named VE1 to become the root bridge for a redundant path switched network. What can be done to ensure that VE1 will always assume the role as the root bridge?

Configure the switch so that it has lower priority than other switches in the network

[单选题]要把交换机的配置文件保存到tftp服务器，应使用的命令为（）

copy running-configt ftp

[单选题]关于OSPF中DR的说法不正确的是（）

如果某路由器优先级比DR优先级高，但启动晚，它会抢占原来的DR自己成为DR

[单选题]You are a systems administrator and you are about to assign static IP addresses to various servers on your network. For the network 192.168.20.24/29 the router is assigned to the first usable host address, while the last usable host address goes to your Sales server. Which one of the following commands would you enter into the IP properties box of the sales server?

IP address: 192.168.20.30 Subnet Mask 255.255.255.248 Default Gateway: 192.168.20.25

解析：解析：ExplanationAsubnetmaskuses29bits.Thismeansthatituses5bitsinthe4thoctet.Thisequatesto255.255.255.248.Thisnetworkhas3bitsforhosts.Usingthe2n-2formula(23-2)inthiscase),weareleftwith6(2*2*2-2=6)hostaddresses.192.168.20.24isthenetworkaddress.Thereforethenextaddress(192.168.20.25)wouldbethefirsthostaddress.Thisaddressmustbeassignedtotherouter,whichservesasthegatewayforthenetwork.Thelastavailablehostaddresswouldbe192.168.20.30(192.168.20.24+6).Thisaddressisassignedtotheserver.Thebroadcastaddressis192.168.20.31.

[单选题]配置路由器时，封装PPP协议的命令是：()

encap ppp

[单选题]下列对访问控制列表的描述不正确的是（）。

访问控制列表可以应用于路由更新的过程当中

[单选题]You are an administrator of the Ezonexam switched network and your goal is to reduce some of the administrative overhead on your network. You plan on achieving this by configuring a new VLAN for each department in the Ezonexam network.However, you need to share the VLAN information across numerous switches. Which of the following would allow you accomplish this?

VTP

解析：D 解析：Explanation: