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單項選擇題Which component of VPN technology ensures that data can be read only by its intended recipient?（）

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

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1.多項選擇題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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2.多項選擇題保留給自環(huán)測試的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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3.多項選擇題以下協(xié)議技術中，采用面向連接方式進行通信的有（）。

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

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4.多項選擇題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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5.單項選擇題在ISDN網(wǎng)絡中，U接口定義在（）之間。

A.TE1和NT2
B.TE2和TA
C.NT1和ISDN網(wǎng)絡
D.NT1和NT2

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6.多項選擇題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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7.單項選擇題下列是外部網(wǎng)關路由協(xié)議的是（）。

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

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8.單項選擇題IP地址中，網(wǎng)絡部分全0表示（）。

A.主機地址
B.網(wǎng)絡地址
C.所有主機
D.所有網(wǎng)絡

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9.單項選擇題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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10.單項選擇題改變您的Quidway路由器名字為myrouter時，應輸入什么命令？（）

A.config myrouter
B.display myroter
C.sysname myrouter

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