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多項選擇題The OSPF Hello protocol performs which of the following tasks (Choose two.)（）。

A.It provides dynamic neighbor discovery.
B.It detects unreachable neighbors in 90 second intervals.
C.It maintains neighbor relationships.
D.It negotiates correctness parameters between neighboring interfaces.
E.Ituses timers to elect the router with the fastest links as the designated router.
F.It broadcasts hello packets throughout the internetwork to discover all routers that are running OSPF.

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1.多項選擇題一個公司正在安裝IP電話。電話和辦公室電腦連接到同個設(shè)備上，為了保證電話數(shù)據(jù)的最大傳輸量，公司需要確定電話流量是和辦公室電腦的數(shù)據(jù)流量不是在同一個網(wǎng)絡(luò)上。以下哪個是最好的網(wǎng)絡(luò)設(shè)備，用來直連到電話和電腦，并且，哪種技術(shù)應該被配置在該設(shè)備上？（）

A.hub
B.router
C.switch
D.STP
E.subinterfaces
F.VLAN

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2.單項選擇題An administrator issues the command ping 127.0.0.1 from the command line prompt on a PC.If a reply is received, what does this confirm?（）

A.The PC has connectivity with a local host.
B.The PC has connectivity with a Layer 3 device.
C.The PC has a default gateway correctly configured
D.The PC has connectivity up to Layer 5 of the OSI model
E.The PC has the TCP/IP protocol stack correctly installed.

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3.單項選擇題 根據(jù)下圖顯示的拓撲結(jié)構(gòu)和路由器配置，一個在該LAN上的主機正在通過INTERNET訪問一個FTP服務(wù)器。下列地址中哪個可以作為路由器發(fā)送到該目的服務(wù)器的數(shù)據(jù)包的源地？（）

A.10.10.0.1
B.10.10.0.2
C.199.99.9.33
D.199.99.9.57
E.200.2.2.17
F.200.2.2.18

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4.單項選擇題How does using the service password encryption command on a router provide additional security?（）

A.by encrypting all passwords passing through the router
B.by encrypting passwords in the plain text configuration file
C.by requiring entry of encrypted passwords for access to the device
D.by configuring an MD5 encrypted key to be used by routing protocols to validate routing exchanges
E.by automatically suggesting encrypted passwords for use in configuring the router

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5.多項選擇題A network administrator wants to ensure that only the server can connect to port Fa0/1 on a Catalyst switch. The server is plugged into the switch Fa0/1 port and the network administrator is about to bring the server online. What can the administrator do to ensure that only the MAC address of the server is allowed by switch port Fa0/1 (Choose two.)（）。

A.Configure port Fa0/1 to accept connections only from the static IP address of the server.
B.Employ a proprietary connector type on Fa0/1 that is incompatible with other host connectors.
C.Configure the MAC address of the server as a static entry associated with port Fa0/1.
D.Bind the IP address of the server to its MAC address on the switch to prevent other hosts from spoofing the server IP address.
E.Configure port security on Fa0/1 to reject traffic with a source MAC address other than that of the server.
F.Configure an access list on the switch to deny server traffic from entering any port other than Fa0/1.

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6.多項選擇題Which two are features of IPv6？（）

A.multicast
B.broadcast
C.allcast
D.podcast
E.anycast

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7.單項選擇題在一個共享的雙絞線的網(wǎng)絡(luò)上的接口上產(chǎn)生了沖突檢測和載波偵聽.通過這個描述，關(guān)于這個網(wǎng)絡(luò)接口你知道了什么？（）

A.這是一個10Mb/s的交換端口
B.這是一個100Mb/s的交換端口
C.這是一個工作在半雙工模式下的以太口
D.這是一個工作在全雙工模式下的以太口
E.這是一個PC機上網(wǎng)卡上的一個接口

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8.單項選擇題What is the maximum data rate specified for IEEE 802.11b WLANs?（）

A.10 Mbps
B.11 Mbps
C.54 Mbps
D.100 Mbps

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9.單項選擇題 根據(jù)下圖，假設(shè)所有路由器接口都配置正確且正常工作，假設(shè)R2上OSPF配置正確，配置在R1上默認路由會怎么影響R2的工作？（）

A.任何到達一個和路由器R1非直連的網(wǎng)絡(luò)的數(shù)據(jù)包都會被丟棄
B.任何到達一個和路由器R2非直連的網(wǎng)絡(luò)的數(shù)據(jù)包都會被丟棄
C.任何到達一個和路由器R2非直連的網(wǎng)絡(luò)的數(shù)據(jù)包都會即時被丟棄，因為R1上缺少網(wǎng)關(guān)
D.直連在R2上的網(wǎng)絡(luò)將不能夠和172.16.100.0，172.16.100.128，172.16.100.64這些子網(wǎng)通訊
E.任何目的地沒有在R2的路由表中的數(shù)據(jù)包，R2將會定向到R1，R1會發(fā)送哪個數(shù)據(jù)包到R2，這樣路由環(huán)路產(chǎn)生

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10.單項選擇題Which command enables RSTP on a switch？（）

A.spanning-tree mode rapid-pvst
B.spanning-tree uplinkfast
C.spanning-tree backbonefast
D.spanning-tree mode mst

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