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單項(xiàng)選擇題What is the principle reason to use a private IP address on an internal network?（）

A.Subnet strategy for private companies.
B.Manage and scale the growth of the internal network.
C.Conserve public IP addresses so that we do not run out of them.
D.Allow access reserved to the devices.

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1.單項(xiàng)選擇題Which layer of the OSI reference model uses flow control, sequencing, and acknowledgements to ensure that reliable networking occurs?（）

A.data link
B.network
C.transport
D.presentation
E.physical

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2.多項(xiàng)選擇題拒絕服務(wù)攻擊的主要原因（）

A.中間人泄露信息
B.主機(jī)或應(yīng)用程序處理非預(yù)期狀況失敗
C.緩沖區(qū)溢出
D.網(wǎng)絡(luò)、主機(jī)或應(yīng)用程序不能處理量非常大的數(shù)據(jù)

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3.單項(xiàng)選擇題Host 1 sends an ICMP echo request to remote sever1. Layer2 header of the frame containing the ping packet（）。

A.The IP address of sever 1.
B.The MAC address of NIC in sever 1.
C.The IP address of F0/0 interface of router R1.
D.The MAC address of the Fa0/0 interface of router R1.
E.The IP address of the s0/0/0 interface of router R2
F.The MAC address of the s0/0/0 interface of router R2

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4.多項(xiàng)選擇題What are three advantages of VLANs？（）

A.VLANs establish broadcast domains in switched networks.
B.VLANs utilize packet filtering to enhance network security.
C.VLANs provide a method of conserving IP addresses in large networks.
D.VLANs provide a low-latency internetworking alternative to routed networks.
E.VLANs allow access to network services based on department,not physical location.
F.VLANs can greatly simplify adding,moving,or changing hosts on the network.

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5.單項(xiàng)選擇題Which layer of the OSI reference model uses the hardware address of a device to ensure message delivery to the proper host on a LAN?（）

A.physical
B.datalink
C.network
D.transport

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