正确答案: B

越靠近数据包的目的地越好

题目：标准访问控制列表应被放置的最佳位置是在（）。

解析：B

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学习资料的答案和解析：

[单选题]当拓扑信息完成交换，相邻路由器具有相同的LSDB时，下列哪项OSPF邻居状态是希望得到的()

FULL

[单选题]SMTP工作在OSI哪一层（）

应用层

[单选题]路由器“路由模式”的提示符号是（）

(config-router)

[多选题]Regarding DHCP (dynamic host configuration protocol), which two of the following choices below are true? (Select two answer choices)

The DHCP Discover message uses FF-FF-FF-FF-FF as the Layer 2 destination address.

The DHCP Discover message uses UDP as the transport layer protocol.

解析：A,B 解析：Explanation:

[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]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.