{"id":319,"date":"2020-11-30T11:29:44","date_gmt":"2020-11-30T16:29:44","guid":{"rendered":"https:\/\/www.alpharithms.com\/?post_type=term&#038;p=319"},"modified":"2021-07-27T08:08:32","modified_gmt":"2021-07-27T12:08:32","slug":"automatic-repeat-request-arq","status":"publish","type":"post","link":"https:\/\/www.alpharithms.com\/automatic-repeat-request-arq-442911\/","title":{"rendered":"Automatic Repeat Request (ARQ)"},"content":{"rendered":"<p><strong>Automatic Repeat Request (ARQ)<\/strong> is a protocol used by data reliability services provided by network communications to make assurances about data transmission over unreliable networks. ARQ is an error-detecting and control protocol that relies on sender and receiver acknowledgments and timers to re-transmit lost or corrupt data.<\/p>\n<p>ARQ protocols are used by network communications protocols like <a href=\"https:\/\/www.alpharithms.com\/transmission-control-protocol-tcp-252209\/\">TCP\/IP<\/a> and other <a href=\"https:\/\/www.alpharithms.com\/network-protocol-layers-432211\/\">network layer services<\/a> to guarantee that data is transmitted successfully. In addition to the data segments being transmitted, ARQ necessitates the addition of header fields to carry acknowledgments (ACKs) as well as sender-side timer variables to indicate packet loss.<\/p>\n<p>As a result of lost or corrupt data, indicated by timeouts or negative ACKs (NAKs), ARQ triggers retransmission of data. At the most fundamental level, ARQ is a <a href=\"https:\/\/www.alpharithms.com\/term\/stop-and-wait-protocol\/\">stop-and-wait protocol<\/a> where network throughput may be significantly reduced.<\/p>\n<p>Such protocols as Go-Back-N and Selective Repeat have been developed to allow the sending of multiple data segments while waiting on ACKs and, in the case of Selective Repeat, introducing only a minimal amount of redundancy in retransmission.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Automatic Repeat Request (ARQ) is a protocol used by data reliability services provided by network communications to make assurances about data transmission over unreliable networks. ARQ is an error-detecting and control protocol that relies on sender and receiver acknowledgments and timers to re-transmit lost or corrupt data. ARQ protocols are used by network communications protocols [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":2472,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[3,260],"tags":[150,461,148,82,151,149,6,126],"acf":[],"_links":{"self":[{"href":"https:\/\/www.alpharithms.com\/wp-json\/wp\/v2\/posts\/319"}],"collection":[{"href":"https:\/\/www.alpharithms.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.alpharithms.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.alpharithms.com\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.alpharithms.com\/wp-json\/wp\/v2\/comments?post=319"}],"version-history":[{"count":1,"href":"https:\/\/www.alpharithms.com\/wp-json\/wp\/v2\/posts\/319\/revisions"}],"predecessor-version":[{"id":320,"href":"https:\/\/www.alpharithms.com\/wp-json\/wp\/v2\/posts\/319\/revisions\/320"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.alpharithms.com\/wp-json\/wp\/v2\/media\/2472"}],"wp:attachment":[{"href":"https:\/\/www.alpharithms.com\/wp-json\/wp\/v2\/media?parent=319"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.alpharithms.com\/wp-json\/wp\/v2\/categories?post=319"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.alpharithms.com\/wp-json\/wp\/v2\/tags?post=319"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}