Inter-server

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In computer network protocol design, inter-server communication is an extension of the client–server model in which data are exchanged directly between servers.^[1] In some fields server-to-server (S2S) is used as an alternative, and the term inter-domain can in some cases be used interchangeably.

Protocols that have inter-server functions as well as the regular client–server communications include the following:

• IPsec, secure network protocol that can be used to secure a host-to-host connection
• The domain name system (DNS), which uses an inter-server protocol for zone transfers;
• The Dynamic Host Configuration Protocol (DHCP);
• FXP, allowing file transfer directly between FTP servers;
• The Inter-Asterisk eXchange (IAX);
• InterMUD;
• The IRC, an Internet chat system with an inter-server protocol allowing clients to be distributed across many servers;
• The Network News Transfer Protocol (NNTP);
• The Protocol for SYnchronous Conferencing (PSYC);
• SIP, a signaling protocol commonly used for Voice over IP;
• SILC, a secure Internet conferencing protocol;
• The Extensible Messaging and Presence Protocol (XMPP, formerly named Jabber).
• ActivityPub a client/server API for creating, updating and deleting content, as well as a federated server-to-server API for delivering notifications and content.
• SMTP which accepts both MUA->MTA traffic, as well as MTA->MTA, but it is usually recommended that different ports are used for these actions

Some of these protocols employ multicast strategies to efficiently deliver information to multiple servers at once.

• Overlay network

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