正确答案: E

The network layer

题目：While troubleshooting a connectivity problem on the network, you issue the ping command from your PC command prompt, but the output shows "request times out."At which OSI layer is this problem associated with?

解析：解析：Explanation:

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举一反三的答案和解析：

[单选题]TELNET工作在OSI哪一层（）

应用层

[单选题]对交换机的描述，正确的是（）

单广播域，多冲突域的设备

[单选题]During the boot sequence, a Ezonexam 2800 series router needs to locate and load an operating system. What is the default order the router uses to find an operating system?

Flash, TFTP server, ROM

解析：解析：Explanation:BootinguptheRouter:CiscorouterscanbootCiscoIOSsoftwarefromtheselocations:1.Flashmemory2.TFTPserver3.ROM(notfullCiscoIOS)Multiplesourceoptionsprovideflexibilityandfallbackalternatives.