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<h2 id="examples">Examples</h2> <p>Examples are the Domain Name System (DNS) which translates domain names to <a href="/facts/Internet_Protocol/Qq6VeEal">Internet Protocol</a> (IP) addresses and the <a href="/facts/Dynamic_Host_Configuration_Protocol/lpASHnhz">Dynamic Host Configuration Protocol</a> (DHCP) to assign networking configuration information to network hosts. Authentication servers identify and authenticate users, provide user account profiles, and may log usage statistics. </p><p><a href="/facts/Email/6pD9GLtI">Email</a>, <a href="/facts/Printing/ta4QpeDE">printing</a> and <a href="/facts/Distributed_file_system/Bz61f7Ce">distributed (network) file system</a> services are common services on <a href="/facts/Local_area_network/edUDxJ6J">local area networks</a>. They require users to have permissions to access the shared resources. </p><p>Other network services include: </p> <ul><li><a href="/facts/Directory_services/6fsVdntu">Directory services</a></li> <li><a href="/facts/Email/6pD9GLtI">Email</a></li> <li><a href="/facts/File_sharing/7GISy0GJ">File sharing</a></li> <li><a href="/facts/Instant_messaging/8lwwDyjK">Instant messaging</a></li> <li><a href="/facts/Online_game/UH6ItLnW">Online game</a></li> <li><a href="/facts/Print_server/4gr2wCYq">Printing</a></li> <li><a href="/facts/File_server/4SFrAdHY">File server</a></li> <li><a href="/facts/Voice_over_IP/5QGBbXYg">Voice over IP</a></li> <li><a href="/facts/Video_on_demand/jWQq1o80">Video on demand</a></li> <li><a href="/facts/Videotelephony/Ya9TMFQD">Videotelephony</a></li> <li><a href="/facts/World_Wide_Web/wvnTrWFq">World Wide Web</a></li> <li><a href="/facts/Simple_Network_Management_Protocol/UNYPVA1C">Simple Network Management Protocol</a></li> <li><a href="/facts/Time_server/KHkfxk73">Time service</a></li> <li><a href="/facts/Wireless_sensor_network/r5LIAVsU">Wireless sensor network</a></li></ul> <h2 id="application-layer">Application layer</h2> <p>In <a href="/facts/Computer_network_programming/lG6r58eY">computer network programming</a>, the <a href="/facts/Application_layer/FAFhLruA">application layer</a> is an <a href="/facts/Abstraction_layer/EV8c84SY">abstraction layer</a> reserved for <a href="/facts/Communications_protocol/5uady7cB">communications protocols</a> and methods designed for process-to-process communications across an <a href="/facts/IP_network/KNkxtSpw">IP network</a>. Application layer protocols use the underlying <a href="/facts/Transport_layer/UmIGUCeK">transport layer</a> protocols to establish host-to-host connections for network services. </p> <h3>TCP-IP network services</h3> <h4>Port numbers</h4> <p>Many IP-based services are associated with a particular <a href="/facts/Well-known_port_number/c30Xg4d4">well-known port number</a> which is standardized by the Internet technical governance. </p><p>For example, World-Wide-Web servers operate on port 80, and email relay servers usually listen on port 25. </p> <h3>TCP versus UDP</h3> <p>Different services use different packet transmission techniques. </p><p>In general, packets that must get through in the correct order, without loss, use TCP, whereas real time services where later packets are more important than older packets use UDP. </p><p>For example, file transfer requires complete accuracy and so is normally done using TCP, and audio conferencing is frequently done via UDP, where momentary glitches may not be noticed. </p><p>UDP lacks built-in <a href="/facts/Network_congestion/9ohkRMso">network congestion</a> avoidance and the protocols that use it must be extremely carefully designed to prevent network collapse. </p> <h2 id="see-also">See also</h2> <ul><li><a href="/facts/Internet_hosting_service/kGcQcePr">Internet hosting service</a></li> <li><a href="/facts/Web_hosting_service/sDHN29ve">Web hosting service</a></li> <li><a href="/facts/DNS_hosting_service/YQoxTPUy">DNS hosting service</a></li> <li><a href="/facts/E-mail_hosting_service/lPhtSHyW">E-mail hosting service</a></li> <li>Category:Network service</li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>"Network Service". SDxCentral. 12 June 2024. Archived from the original on 12 June 2015. Retrieved 4 April 2024. Network Service – a capability that facilitates a network operation. It typically is provided by a server (which can be running one or more services), based on network protocols running at the application layer in the Open Systems Interconnection (OSI) model of the network. <a href="https://web.archive.org/web/20150612134130/https://www.sdxcentral.com/term/network-service/" target="_blank">https://web.archive.org/web/20150612134130/https://www.sdxcentral.com/term/network-service/</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> </ol>