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單項選擇題 A network administrator is troubleshooting the OSPF configuration of routers R1 an dR2.The routers cannote stablish an adjacency relation ship on their common Ethernet link.The graphic shows the output of the show ip ospf interface e0 command for routers R1 an dR2.Based on the information in the graphic，what is the cause of this problem？（）

A.The OSPF area is not configured properly.
B.The priority on R1 should be set higher.
C.The cost on R1 should be set higher.
D.The hello and dead timers are not configured properly.
E.A backup designated router needs to be added to the network.
F.The OSPF process ID numbers must match.

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1.單項選擇題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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2.單項選擇題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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3.多項選擇題拒絕服務(wù)攻擊的主要原因（）

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

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4.單項選擇題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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5.多項選擇題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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