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單項(xiàng)選擇題Which type of attack is characterized by flood of packet that requesing a TCP connection to a server?（）

A.denial of service
B.brute force
C.reconnaissance
D.Trojan horse

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1.單項(xiàng)選擇題Which item represents the standard IPACL？（）

A.access-list 50 deny 192.168.1.10.0.0.255
B.access-list 110 permit ip any any
C.access-list 2500 deny tcp any host 192.168.1.1 eq22
D.access-list 101 deny tcp any host 192.168.1.1

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2.單項(xiàng)選擇題What is the default routing update period for RIPv2?（）

A.15 seconds
B.30 seconds
C.180 seconds
D.240 seconds

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3.多項(xiàng)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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4.多項(xiàng)選擇題一個(gè)公司正在安裝IP電話。電話和辦公室電腦連接到同個(gè)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(gè)網(wǎng)絡(luò)上。以下哪個(gè)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(yīng)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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5.單項(xiàng)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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