正确答案: ADE

传输质量高 使用虚电路 专用线路

题目：网络中经常使用DDN服务，请选出DDN的优点（）

解析：ADE

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举一反三的答案和解析：

[单选题]下列路由协议中，属于链路状态路由协议的是（）

OSPF

[多选题]As the Ezonexam network administrator, you are required to have a firm understanding of the OSI model. Why does the data communication industry use the layered OSI reference model? (Choose two)

It encourages industry standardization by defining what functions occur at each layer of the model

It divides the network communication process into smaller and simpler components; thus aiding component development, design and troubleshooting

解析：解析：Explanation:

[多选题]With regard to Ethernet media access methods, which of the following are true?(Choose all that apply.)

A device listens and waits until the media is not busy before transmitting.

All devices on an Ethernet segment see data that passes on the network medium.

解析：解析：Explanation:

[单选题]为了使配置私有IP的设备能够访问互联网，应采用的技术是()

NAT

[单选题]What is the purpose of the spanning-tree algorithm in a switched LAN?

To prevent switching loops in networks with redundant switched paths.

解析：解析：Explanation:STPisusedinLANswithredundantpathsorroutestopreventloopsinalayer2switchedorbridgedLAN.IncorrectAnswers:A,B:TheprimarypurposeofSTPistopreventloops,notformonitoringormanagementofswitchesorVLANs.D.VLANsareusedtosegmentaLANintomultiplecollisiondomains,buttheSTPprocessalonedoesnotdothis.E.Routersareusedtopreventroutingloopsatlayer3oftheOSImodel.STPoperatesatlayer2.

[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:

[单选题]能够分配给设备的IP，应该是（）

网络有效IP

[单选题]From where does a small network typically get its IP network addresses or IP block?

From the Internet Service Provider (ISP)

解析：解析：Explanation:

[单选题]哪个ACL可允许主机10.220.158.10访问web服务器192.168.3.244()

access-list 101 permit tcp 10.220.158.10 0.0.0.0 host 192.168.3.224 eq 80