在Internet中，nntp服务的TCP标准端口号是（）。

A:37 B:119 C:58 D:79

发送电子邮件所用的协议是（）。

A:SMTP B:POP3 C:NNTP D:FTP

防火墙配置时应确保（）服务不开放。

A:Rlogin B:NNTP C:Finger D:NFS

(56) is a one-way function that takes an arbitrarily long piece of plaintext and from it computes a fixed-length bit string.
(57) is a protocol that most USENET machines now use it to allow news articles to propagate from one machine to another over a reliable connection.
(58) is an approach preferred by cable TV providers. In this solution the fiber terminates at an opto-electrical converter and the final segment is a shared coaxial cable.
(59) is a device used to connect two separate network that use different communication protocol.
(60) is a digital-to-digital polar encoding method in which the signal level is always either positive or negative.

A:RTP B:RTTP C:FTP D:NNTP

For each blank, choose the best answer from the four choices and write down on the answer sheet.
(1) is a one-way function that takes an arbitrarily long piece of plaintext and from it computes a fixed-length bit string.
(2) is a protocol that most USENET machines now use it to allow news articles to propagate from one machine to another over a reliable connection.
(3) is an approach preferred by cable TV providers. In this solution the fiber terminates at an optoelectrical converter and the final segment is a shared coaxial cable.
(4) is a device used to connect two separate network that use different communication protocol.
(5) is a digital-to-digital polar encoding method in which the signal level is always either positive or negative.

A:RTP B:RTTP C:FTP D:NNTP

在WWW服务器与客户机之间发送和接收HTML文档时，使用的协议是______。

A:FTP B:GOPHER C:HTTP D:NNTP

The essence of (74) is the invention of a hierarchical, domain-based naming scheme. It is primarily used for mapping host names and e-mail destinations to IP addresses.

A:DNS B:NNTP C:CDP D:FTP

______协议负责从新闻组接收信息，以及向新闻组发送信息。

A:NNTP B:SNMP C:NCP D:SMTP

The essence of (74) is the invention of a hierarchical, domain-based naming scheme. It is primarily used for mapping host names and e-mail destinations to IP addresses.

A:DNS B:NNTP C:CDP D:FTP