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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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

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

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