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多項選擇題It has become necessary to configure an existing serial interface to accept a second Frame Relay virtual circuit.Which of the following processes are required to accomplish this task?（）

A.configure static frame relay map entries for each subinterface network.
B.remove the ip address from the physical interface
C.create the virtual interfaces with the interface command
D.configure each subinterface with its own IP address
E.disable split horizon to prevent routing loops between the subinterface networks
F.encapsulate the physical interface with multipoint PPP

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1.多項選擇題在OSI數(shù)據(jù)封裝過程中，以下哪項步驟描述正確？（）

A.傳輸層把一個數(shù)據(jù)流分成段，并可以增加可靠性和流控制信息。
B.數(shù)據(jù)鏈路層增加物理源和目的地地址以及一個FCS字段。
C.當網(wǎng)絡(luò)層封裝源和目的地主機的地址和協(xié)議相關(guān)的控制信息的幀分組被創(chuàng)建。
D.當網(wǎng)絡(luò)層增加了第3層的地址和控制信息，以一個段分組被創(chuàng)建。
E.表示層轉(zhuǎn)換位成電壓為通過物理鏈路傳輸。

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2.單項選擇題A接收到主機計算上一幀的校驗和，并確定該幀被損壞。所述幀然后被丟棄。在OSI哪一層會出現(xiàn)這種情況？（）

A.會話
B.網(wǎng)絡(luò)
C.物理
D.數(shù)據(jù)鏈路
E.傳輸

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3.多項選擇題A Catalyst 2950 needs to be reconfigured. What steps will ensure that the old configuration is erased？（）

A.Erase flash.
B.Restart the switch.
C.Delete the VLAN database.
D.Erase the running configuration.
E.Erase the startup configuration.
F.Modify the configuration register.

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4.單項選擇題網(wǎng)絡(luò)接口上產(chǎn)生了沖突檢測和載波監(jiān)聽共享的雙絞線的網(wǎng)絡(luò)上啟用。從這句話，什么是已知的關(guān)于網(wǎng)絡(luò)接口端口？（）

A.這是一個為10Mb / s交換機端口。
B.這是一個的100Mbs交換機端口。
C.這是一個以太網(wǎng)端口工作在半雙工模式。
D.這是一個以太網(wǎng)端口工作在全雙工模式。
E.這是在一臺PC的網(wǎng)絡(luò)接口卡的端口。

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5.多項選擇題Which statements describe two of the benefits of VLAN Trunking Protocol？（）

A.VTP allows routing between VLANs.
B.VTP allows a single switch port to carry information to more than one VLAN.
C.VTP allows physically redundant links while preventing switching loops.
D.VTP simplifies switch administration by allowing switches to automatically share VLAN configuration information.
E.VTP helps to limit configuration errors by keeping VLAN naming consistent across the VTP domain.
F.VTP enhances security by preventing unauthorized hosts from connecting to the VTP domain.

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