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單項(xiàng)選擇題Which statement is true, as relates to classful or classless routing?（）

A.Automatic summarization at classful boundries can cause problems on discontinuous subnets
B.EIGRP and OSPF are classful routing protocols and summarize routes by default
C.RIPv1 and OSPF are classless routing protocols
D.Classful routing protocols send the subnet mask in routing updates

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1.單項(xiàng)選擇題Which device might be installed at a branch office to enable and manage an IPsec site-to-site VPN?（）

A.Cisco IOS IPsec/SSL VPN client
B.Cisco VPN Clinet
C.ISDN terminal adapter
D.Cisco Adaptive Security Appliance

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2.單項(xiàng)選擇題一個(gè)交換機(jī)把所有的端口以全雙工的模式加到一個(gè)vlan里，把一個(gè)端口加入到一個(gè)新的vlan里會(huì)對(duì)此交換機(jī)產(chǎn)生什么影響？（）

A.更多的沖突域?qū)⒈粍?chuàng)建。
B.IP地址的利用效率會(huì)更高。
C.更多帶寬將需要比以前需要的。
D.另外一個(gè)廣播域?qū)⒈粍?chuàng)建。

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3.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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4.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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5.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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