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在 Windows 中，可以使用（ 35）命令测试 DNS 正向解析功能，要查看域名 www.aaa.com所对应的主机 IP 地址，须将 type 值设置为（36 ）。35A. arpB. nslookupC. cernetD. netstat36A. aB. nsC. mxD. cname
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甲、乙两个用户均向同一 CA 申请了数字证书，数字证书中包含（ 40）。以下关于数字证书的说法中，正确的是（41 ）。40A.用户的公钥B.用户的私钥C. CA 的公钥D. CA 的私钥41A.甲、乙用户需要得到 CA 的私钥，并据此得到 CA 为用户签署的证书B.甲、乙用户如需互信，可相互交换数字证书C.用户可以自行修改数字证书中的内容D.用户需要数字证书加密保存
有 4 个网络地址：192.168.224.1、192.168.223.255、192.68.232.25 和 192.168.216.5.如果子网掩码为 255.255.240.0，则这 4 个地址分别属于（50 ）个子网。下面列出的地址对中，属于同一个子网的是（51 ）。50A.1B.2C.3D.451A.192.168.224.1 和 192.168.223.255B.192.168.223.255 和 192.68.232.25C.192.68.232.25 和 192.168.216.5D.192.168.223.255 和 192.168.216.5
A virtual (1 ) network, or VPN, is an encrypted connection over the Internet from a device toa network. The encrypted connection helps ensure that sensitive data is safely (2 ). It prevents( 3) people from eavesdropping on the traffic and allows the user to conduct work remotely. Traffic on the virtual network is sent securely by establishing an encrypted connection across theInternet known as a (4 ).A remote access VPN securely connects a device outside the corporateoffice. A site-to-site VPN connects the corporate office to branch offices over the Internet. Site-to-site VPNs are used when distance makes it impractical to have direct network connectionsbetween these offices. Think of site-to-site access as (5 ) to network.1A. publicB. privateC. personalD. proper2A. encodedB. encryptedC. storedD. transmitted3A. employedB. authorizedC. unauthorizedD. criminal4A. channelB. pathC. tunnelD. route5A. networkB. deviceC. computerD. endpoin
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