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{"id":768,"date":"2021-07-17T19:17:02","date_gmt":"2021-07-17T19:17:02","guid":{"rendered":"https:\/\/www.wikitechy.com\/interview-questions\/?p=768"},"modified":"2021-09-11T07:07:27","modified_gmt":"2021-09-11T07:07:27","slug":"what-are-the-layers-of-osi","status":"publish","type":"post","link":"https:\/\/www.wikitechy.com\/interview-questions\/networking\/what-are-the-layers-of-osi\/","title":{"rendered":"What are the layers of OSI ?"},"content":{"rendered":"<div class=\"TextHeading\">\n<div class=\"hddn\">\n<h2 id=\"what-are-the-layers-of-osi\" class=\"color-pink\" style=\"text-align: justify;\">What are the layers of OSI ?<\/h2>\n<\/div>\n<\/div>\n<p style=\"text-align: justify;\">There are seven Layers in Open Systems Interconnection Model.They are:<\/p>\n<div class=\"ImageContent\" style=\"text-align: justify;\">\n<div class=\"hddn\"><img decoding=\"async\" class=\"img-responsive center-block aligncenter\" src=\"https:\/\/cdn.wikitechy.com\/interview-questions\/networking\/what-are-the-layers-of-osi.png\" alt=\"What are the layers of OSI\" \/><\/div>\n<\/div>\n<div class=\"TextHeading\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<h2 id=\"layer-1-the-physical-layer\" class=\"color-blue\">Layer 1 : The Physical layer<\/h2>\n<\/div>\n<\/div>\n<div class=\"Content\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<ul>\n<li>This layer conveys the bit stream across the\u00a0<a href=\"https:\/\/www.wikitechy.com\/errors-and-fixes\/windows\/network-connection-issues-in-windows\" target=\"_blank\" rel=\"noopener\">network<\/a>\u00a0either electrically, mechanically or through radio waves.<\/li>\n<li>The physical layer covers a variety of devices and mediums, among them cabling, connectors, receivers, transceivers and repeaters.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div class=\"TextHeading\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<h2 id=\"layer-2-the-data-link-layer\" class=\"color-blue\">Layer 2 : The Data-link layer<\/h2>\n<\/div>\n<\/div>\n<div class=\"Content\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<ul>\n<li>This layer sets up links across the physical network, putting packets into network frames.<\/li>\n<li>This layer has two sub-layers: the logical link control layer and the media access control layer (MAC).\u00a0<a href=\"https:\/\/www.wikitechy.com\/tutorials\/ethical-hacking\/computer-hacking-tutorial\/what-is-mac-address-and-how-to-get-mac-address-in-my-computer\" target=\"_blank\" rel=\"noopener\">MAC layer<\/a>\u00a0types include Ethernet and 802.11 wireless specifications.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div class=\"TextHeading\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<h2 id=\"layer-3-the-network-layer\" class=\"color-blue\">Layer 3 : The Network layer<\/h2>\n<\/div>\n<\/div>\n<div class=\"Content\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<ul>\n<li>This layer handles addressing and routing the data &#8212; sending it in the right direction to the right destination on outgoing transmissions and receiving incoming transmissions at the packet level. IP is the network layer for the internet.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div class=\"TextHeading\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<h2 id=\"layer-4-the-transport-layer\" class=\"color-blue\">Layer 4 : The Transport layer<\/h2>\n<\/div>\n<\/div>\n<div class=\"Content\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<ul>\n<li>This layer manages packetization of data, then the delivery of the packets, including checking for errors in the data once it arrives.<\/li>\n<li>On the internet,\u00a0<a href=\"https:\/\/www.wikitechy.com\/tutorials\/linux\/how-to-increase-the-maximum-number-of-tcp-ip-connections-in-linux\" target=\"_blank\" rel=\"noopener\">TCP<\/a>\u00a0and UDP provide these services for most applications as well.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div class=\"TextHeading\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<h2 id=\"layer-5-the-session-layer\" class=\"color-blue\">Layer 5 : The Session layer<\/h2>\n<\/div>\n<\/div>\n<div class=\"Content\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<ul>\n<li>This layer sets up, coordinates and terminates conversations. Its services include authentication and reconnection after an interruption. On the internet, Transmission Control Protocol (TCP) and User Datagram Protocol (UDP) provide these services for most applications.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div class=\"TextHeading\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<h2 id=\"layer-6-the-presentation-layer\" class=\"color-blue\">Layer 6 : The Presentation layer<\/h2>\n<\/div>\n<\/div>\n<div class=\"Content\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<ul>\n<li>This layer is usually part of an operating system (OS) and converts incoming and outgoing data from one presentation form to another.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div class=\"TextHeading\" style=\"text-align: justify;\">\n<div class=\"hddn\">\n<h2 id=\"layer-7-the-application-layer\" class=\"color-blue\">Layer 7 : The Application layer<\/h2>\n<\/div>\n<\/div>\n<div class=\"Content\">\n<div class=\"hddn\">\n<ul>\n<li style=\"text-align: justify;\">This is the layer at which communication partners are identified ,network capacity is assessed and where the data or application is presented in a visual form.<\/li>\n<li style=\"text-align: justify;\">This layer is not the application itself, it is the set of services an application should be able to make use of directly, although some applications may perform application-layer functions.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Answer : There are seven Layers in Open Systems Interconnection 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