單項選擇題

VLAN tag在OSI參考模型的哪一層？（）

A.應(yīng)用層
B.表示層
C.會話層
D.傳輸層
E.網(wǎng)絡(luò)層
F.鏈路層
G.物理層

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RIP協(xié)議引入路由保持機(jī)制的作用是防止路由形成環(huán)路。

答案：正確

單項選擇題

While troubleshooting a network connectivity problem, a technician observes steady link lights on both the workstation NIC and the switch port to which the workstation is connected. However, when the ping command is issued from the workstation, the output message "Request timed out." is displayed. At which layer of the OSI model does the problem most likely exist（）。

A.the session layer
B.the protocol layer
C.the data link layer
D.the access layer
E.the network layer
F.the application layer