Which statement is true, as relates to...

单项选择题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.单项选择题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.单项选择题一个交换机把所有的端口以全双工的模式加到一个vlan里，把一个端口加入到一个新的vlan里会对此交换机产生什么影响？（）

A.更多的冲突域将被创建。
B.IP地址的利用效率会更高。
C.更多带宽将需要比以前需要的。
D.另外一个广播域将被创建。

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3.单项选择题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.多项选择题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.单项选择题哪个交换机会在STP选择中成为根桥？（）

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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6.单项选择题Which IPsec security protocol should be used when confidentiality is required?（）

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

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7.多项选择题哪两个协议所使用的网桥和/或交换机，以防止在第2层网络环路？（）

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

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8.多项选择题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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9.单项选择题What is the purpose of the inverse ARP？（）

A.to map a known DLCI to an IP address
B.to map a known IP address to a MAC address
C.to map known SPID to a MAC address
D.to map a known DLCI to a MAC address
E.to map a known IP address to a SPID
F.to map a known MAC address to an IP address

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10.单项选择题switchport trunk native vlan 999 这个命令起什么作用？（）

A.它指定VLAN999转发未做标记的流量。
B.它阻止VLAN999转发主干的流量。
C.它创建了一个VLAN999接口。
D.它指定VLAN999作为默认为所有未知标记的流量。

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