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單項(xiàng)選擇題At which layer of the OSI model is RSTP used to prevent loops?（）

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

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1.多項(xiàng)選擇題Which three statements about RSTP are true？（）

A.RSTP significantly reduces topology reconverging time after a link failure.
B.RSTP expends the STP port roles by adding the alternate and backup roles.
C.RSTP port states are blocking，discarding，learing，or forwarding.
D.RSTP also uses the STP proprsal-agreement sequence.
E.RSTP use the same timer-baseed process as STP on point-to-point links.
F.RSTP provides a faster transition to the forwarding state on point-to-point links than STP does.

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2.單項(xiàng)選擇題哪個(gè)交換機(jī)會(huì)在STP選擇中成為根橋？（）

A. 32768： 11-22-33-44-55-66
B. 32768： 22-33-44-55-66-77
C. 32769： 11-22-33-44-55-65
D. 32769： 22-33-44-55-66-78

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3.單項(xiàng)選擇題Which IPsec security protocol should be used when confidentiality is required?（）

A.PSK
B.AH
C.MD5
D.ESP

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4.多項(xiàng)選擇題哪兩個(gè)協(xié)議所使用的網(wǎng)橋和/或交換機(jī)，以防止在第2層網(wǎng)絡(luò)環(huán)路？（）

A. 802.1d
B. VTP
C. 802.1q
D. STP
E. SAP

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5.多項(xiàng)選擇題the network administrator has been asked to give reasons for moving from ipv4 to ipv6. what are two valid reasons for adopting ipv6 over ipv4?（）

A.telnet access does not require a password
B.nat
C.no broadcast
D.chanage of destination address in the ipv6 header
E.chanage of source address in the ipv6 header
F.autoconfiguration

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