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The TCP/IP Guide  9  TCP/IP Application Layer Protocols, Services and Applications (OSI Layers 5, 6 and 7)       9  TCP/IP Key Applications and Application Protocols            9  TCP/IP File and Message Transfer Applications and Protocols (FTP, TFTP, Electronic Mail, USENET, HTTP/WWW, Gopher)                 9  Usenet (Network News) and the TCP/IP Network News Transfer Protocol (NNTP)                      9  TCP/IP Network News Transfer Protocol (NNTP)

NNTP Commands 1 2 3 4 NNTP Status Responses and Response Codes

NNTP Transport Extensions

The first group is called the NNTP transport extensions and consists of a small group of related commands that are designed to improve inter-server message propagation. Most of these implement NNTP's stream mode, which provides a more effective way of moving large numbers of articles from one server to another, as described in the topic on inter-server communication. Table 267 describes the new transport commands.

Table 267: NNTP Transport Extensions

Command Code	Command	Parameters	Description
MODE STREAM	Set Stream Mode	None	Used to tell the server that the client wants to operate in stream mode, using the CHECK and TAKETHIS commands.
CHECK	Check If Article Exists	Message ID	Used in stream mode by a server acting as a client to ask another server if it has a copy of a particular article. The server responds back indicating whether or not it wishes to be sent a copy of the article. This command is similar to IHAVE, except that the client does not have to wait for a reply before sending the next command.
TAKETHIS	Send Article To Server	Message ID	When a server responds to a CHECK command indicating that it wants a copy of a particular message, the client sends it using this command.
XREPLIC	Replicate Articles	List of newsgroups and article numbers	This command was created for the special purpose of copying large numbers of articles from one server to another. It is not widely used.

NNTP Commands 1 2 3 4 NNTP Status Responses and Response Codes

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