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多項(xiàng)選擇題At which layers of the OSI model do WANs operate (Choose two.)（）。

A.application layer
B.session layer
C.transport layer
D.network layer
E.datalink layer
F.physical layer

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1.單項(xiàng)選擇題Which statement is correct regarding the operation of DHCP?（）

A.A DHCP client uses a ping to detect address conflicts.
B.A DHCP server uses a gratuitous ARP to detect DHCP clients.
C.A DHCP client uses a gratuitous ARP to detect a DHCP server.
D.If an address conflict is detected, the address is removed from the pool and an administrator must resolve the conflict.
E.If an address conflict is detected, the address removed from the pool for an amount of time configurable by the administrator.
F.If an address conflict is detected, the address is removed from the pool and will not be reused until server is rebooted.

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2.單項(xiàng)選擇題 根據(jù)下圖，哪個(gè)選項(xiàng)描述了DLCI 17？（）

A.DLCI 17描述了R2和R3之間的ISDN線路
B.DLCI 17描述了一條在R2上的PVC 不能用在R3和R1上
C.DLCI 17是R2使用的二層地址，用來描述一條到R3的PVC
D.DlDLCI 17描述了一條從R2 R3到服務(wù)提供商撥號網(wǎng)絡(luò)

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3.多項(xiàng)選擇題Why does the data communication industry use the layered OSI reference model (Choose two.)（）。

A.It divides the network communication process into smaller and simpler components, thus aiding component development, design, and troubleshooting.
B.It enables equipment from different vendors to use the same electronic components, thus saving research and development funds.
C.It supports theevolution of multiple competing standards, and thus provides business opportunities for equipment manufacturers.
D.It encourages industry standardization by defining what functions occur at each layer of the model.
E.It provides a means by which changes in functionality in one layer require changes in other layers.

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4.單項(xiàng)選擇題You and a co-worker have established wireless communication directly between your wireless laptops. What type of wireless topology has been created（）。

A.BSS
B.ESS
C.IBSS
D.SSID

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5.單項(xiàng)選擇題 When upgrading the IOS image, the network administrator receives the exhibited error message. What could be the cause of this error（）。

A.The new IOS image is too large for the router flash memory.
B.The TFTP server is unreachable from the router.
C.The new IOS image is not correct for this router platform.
D.The IOS image on the TFTP server is corrupt.
E.There is not enough disk space on the TFTP server for the IOS image.

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