Which two values are used by Spanning ...

多项选择题Which two values are used by Spanning Tree Protocol to elect a root bridge (Choose two.)（）。

A.amount of RAM
B.bridge priority
C.IOS version
D.IP address
E.MAC address
F.speed of the links

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1.单项选择题Which component of VPN technology ensures that data can be read only by its intended recipient?（）

A.dataintegrity
B.encryption
C.keyexchange
D.authentication

2.多项选择题An inbound access list has been configured on a serial interface to deny packet entry for TCP and UDP ports 21, 23 and 25. What types of packets will be permitted by this ACL? （）

A.FTP
B.Telnet
C.SMTP
D.DNS
E.HTTP
F.POP3

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3.多项选择题保留给自环测试的IP地址是（）。

A.127.0.0.0
B.127.0.0.1
C.224.0.0.9
D.126.0.0.1
E.127.0.0.121

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4.多项选择题以下协议技术中，采用面向连接方式进行通信的有（）。

A.IP
B.X.25
C.Ethernet
D.Frame-relay

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5.多项选择题Given the address 192.168.20.19/28, which of the following are valid host addresses on this subnet?（）

A.192.168.20.29
B.192.168.20.16
C.192.168.20.17
D.192.168.20.31
E.192.168.20.0

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6.单项选择题在ISDN网络中，U接口定义在（）之间。

A.TE1和NT2
B.TE2和TA
C.NT1和ISDN网络
D.NT1和NT2

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7.多项选择题A national retail chain needs to design an IP addressing scheme to support a nationwide network. The company needs a minimum of 300 sub-networks and a maximum of 50 host addresses per subnet. Working with only one Class B address, which of the following subnet masks will support an appropriate addressing scheme? （）

A.255.255.255.0
B.255.255.255.128
C.255.255.252.0
D.255.255.255.224
E.255.255.255.192
F.255.255.248.0

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8.单项选择题下列是外部网关路由协议的是（）。

A.rip
B.ospf
C.igrp
D.bgp
E.eigrp

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9.单项选择题IP地址中，网络部分全0表示（）。

A.主机地址
B.网络地址
C.所有主机
D.所有网络

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10.单项选择题On point-to-point networks, OSPF hello packets are addressed to which address（）。

A.127.0.0.1
B.172.16.0.1
C.192.168.0.5
D.223.0.0.1
E.224.0.0.5
F.254.255.255.255

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