{"id":2656,"date":"2020-11-18T15:30:59","date_gmt":"2020-11-18T07:30:59","guid":{"rendered":"https:\/\/cciedump.spoto.net\/blog\/?p=2656"},"modified":"2024-11-05T15:04:48","modified_gmt":"2024-11-05T07:04:48","slug":"ospf-routing-fundamentals-you-must-know-in-ccna-exam","status":"publish","type":"post","link":"https:\/\/cciedump.spoto.net\/blog\/ospf-routing-fundamentals-you-must-know-in-ccna-exam_2656.html","title":{"rendered":"OSPF Routing Fundamentals You Must Know in CCNA Exam!"},"content":{"rendered":"<p><span data-preserver-spaces=\"true\">OSPF stands for Open Shortest Path First.<\/span><\/p>\n<p><strong><span data-preserver-spaces=\"true\">Definition:<\/span><\/strong><span data-preserver-spaces=\"true\">\u00a0OSPF is a routing protocol used to determine the best route to transmit data packets within an IP network. The IETF publishes it as an internal gateway protocol to replace RIP. The OSPF specification is published as &#8220;Request for Comments (RFC) 1247&#8221;.<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">Please note that OSPF is a link-state routing protocol, while RIP and IGRP are distance vector routing protocols. The router running the distance-vector algorithm sends all or part of its routing table to its neighbors in routing update messages.<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">OSPF sends link state advertisements (LSAs) to all other routers in the same area. OSPF LSA contains information about the connected interface, the metrics used, and other variables. OSPF routers use SPF (shortest path first) algorithm to calculate the shortest path to each node. SPF algorithm is also called the Dijkstra algorithm.<\/span><\/p>\n<p>If you want to know deeply about OSPF, I would like to suggest you enroll in the <em><strong><a href=\"https:\/\/cciedump.spoto.net\/200-301-certificates.php\">SPOTO CCNA training course<\/a><\/strong><\/em>. Check the<em><strong><a href=\"https:\/\/www.youtube.com\/watch?v=vVIVctax6ZU\"> IPV6 technology training video<\/a><\/strong><\/em> below explained by the SPOTO CCIE expert!<\/p>\n<div class=\"video-container\"><iframe title=\"Cisco CCNA 200-301 Practice Questions: IPV6 Technologies-SPOTO\" width=\"900\" height=\"506\" src=\"https:\/\/www.youtube.com\/embed\/vVIVctax6ZU?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div>\n<p>Next, we will launch the new CCNA\/CCNP video course to help you know better about the technical points! Follow us for more info!<\/p>\n<table width=\"463\">\n<tbody>\n<tr>\n<td width=\"142\"><strong>Dumps<\/strong><\/td>\n<td width=\"321\"><strong>Technical topics<\/strong><\/td>\n<\/tr>\n<tr>\n<td rowspan=\"3\" width=\"142\"><strong>CCNA 200-301<\/strong><\/td>\n<td width=\"321\">OSPF<\/td>\n<\/tr>\n<tr>\n<td width=\"321\">EIGRP<\/td>\n<\/tr>\n<tr>\n<td width=\"321\">VLAN<\/td>\n<\/tr>\n<tr>\n<td rowspan=\"3\" width=\"142\"><strong>EI 350-401<\/strong><\/td>\n<td width=\"321\">OSPF\\BGP<\/td>\n<\/tr>\n<tr>\n<td width=\"321\">SD-Access\\DNA<\/td>\n<\/tr>\n<tr>\n<td width=\"321\">Classic topic<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n<table id=\"tablepress-1\" class=\"tablepress tablepress-id-1\">\n<thead>\n<tr class=\"row-1 odd\">\n\t<th class=\"column-1\">Categories<\/th><th class=\"column-2\">Exam Code<\/th><th class=\"column-3\">Pass Exam Dumps<\/th>\n<\/tr>\n<\/thead>\n<tbody class=\"row-hover\">\n<tr class=\"row-2 even\">\n\t<td rowspan=\"3\" class=\"column-1\">CCNA<\/td><td class=\"column-2\">200-301<\/td><td class=\"column-3\"><a rel=\"nofollow\" href=\"https:\/\/tb.53kf.com\/code\/client\/10172212\/1?custom_channel=ccieblogna\"><img src=\"https:\/\/cciedump.spoto.net\/blog\/wp-content\/uploads\/2020\/08\/get-now-1-1.jpg\" alt=\"CCNA 200-301\"><\/a><\/td>\n<\/tr>\n<tr class=\"row-3 odd\">\n\t<td class=\"column-2\">200-901 DevNet<\/td><td class=\"column-3\"><a rel=\"nofollow\" href=\"https:\/\/tb.53kf.com\/code\/client\/10172212\/1?custom_channel=ccieblogna\"><img src=\"https:\/\/cciedump.spoto.net\/blog\/wp-content\/uploads\/2020\/08\/get-now-1-1.jpg\" alt=\"200-901 DevNet\"><\/a><\/td>\n<\/tr>\n<tr class=\"row-4 even\">\n\t<td class=\"column-2\">200-201 Cyber Ops<\/td><td class=\"column-3\"><a rel=\"nofollow\" href=\"https:\/\/tb.53kf.com\/code\/client\/10172212\/1?custom_channel=ccieblogna\"><img src=\"https:\/\/cciedump.spoto.net\/blog\/wp-content\/uploads\/2020\/08\/get-now-1-1.jpg\" alt=\"200-201 Cyber Ops\"><\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<!-- #tablepress-1 from cache -->\n<p><a href=\"https:\/\/tb.53kf.com\/code\/client\/10172212\/1?custom_channel=chenjia\" rel=\"nofollow\"><img loading=\"lazy\" class=\"alignnone wp-image-1863\" src=\"https:\/\/cciedump.spoto.net\/blog\/wp-content\/uploads\/2020\/08\/get-100-real-dump.gif\" alt=\"get 100% real dumps\" width=\"397\" height=\"115\" \/><\/a><\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_17 counter-hierarchy counter-decimal ez-toc-light-blue\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" style=\"display: none;\"><i class=\"ez-toc-glyphicon ez-toc-icon-toggle\"><\/i><\/a><\/span><\/div>\n<nav><ul class=\"ez-toc-list ez-toc-list-level-1\"><li class=\"ez-toc-page-1 ez-toc-heading-level-2\"><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/cciedump.spoto.net\/blog\/ospf-routing-fundamentals-you-must-know-in-ccna-exam_2656.html\/#Advantages_of_OSPF\" title=\"Advantages of OSPF\">Advantages of OSPF<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-2\"><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/cciedump.spoto.net\/blog\/ospf-routing-fundamentals-you-must-know-in-ccna-exam_2656.html\/#Disadvantages_of_OSPF\" title=\"Disadvantages of OSPF:\">Disadvantages of OSPF:<\/a><ul class=\"ez-toc-list-level-3\"><li class=\"ez-toc-heading-level-3\"><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/cciedump.spoto.net\/blog\/ospf-routing-fundamentals-you-must-know-in-ccna-exam_2656.html\/#OSPF_network_hierarchy\" title=\"OSPF network hierarchy:\">OSPF network hierarchy:<\/a><\/li><\/ul><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-2\"><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/cciedump.spoto.net\/blog\/ospf-routing-fundamentals-you-must-know-in-ccna-exam_2656.html\/#In_conclusion\" title=\"In conclusion\">In conclusion<\/a><\/li><li class=\"ez-toc-page-1 ez-toc-heading-level-2\"><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/cciedump.spoto.net\/blog\/ospf-routing-fundamentals-you-must-know-in-ccna-exam_2656.html\/#Latest_passing_report-100_pass_guarantee\" title=\"Latest passing report-100% pass guarantee\">Latest passing report-100% pass guarantee<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Advantages_of_OSPF\"><\/span><strong>Advantages of OSPF<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span data-preserver-spaces=\"true\">\u2022 OSPF is an open standard and has nothing to do with any particular vendor.<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">\u2022 OSPF may be a hierarchical routing protocol that uses area 0 (autonomous system) at the top of the hierarchy.<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">\u2022 OSPF uses a link-state algorithm, and the OSPF network diameter may be much larger than the diameter of RIP.<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">\u2022 OSPF supports variable-length subnet mask (VLSM), which can effectively utilize network resources.<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">\u2022 OSPF uses multicast within the area.<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">\u2022 After initialization, OSPF only sends updates on the part of the routing table that has been changed, instead of sending the entire routing table, thus saving network bandwidth.<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">\u2022 Use areas to logically segment the OSPF network to improve management and reduce the routing table&#8217;s size.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Disadvantages_of_OSPF\"><\/span><strong>Disadvantages of OSPF:<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span data-preserver-spaces=\"true\">\u2022 Due to the implementation of the SPF algorithm, OSPF takes a lot of processor resources. OSPF maintains multiple copies of routing information, thereby increasing the quantity of memory required.<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">\u2022 Compared with RIP, OSPF is a more complex protocol to implement.<\/span><\/p>\n<h4 class=\"card-title\"><a title=\"Download Free SPOTO Latest CCNA 200-301 Practice Tests 2020\" href=\"https:\/\/cciedump.spoto.net\/blog\/download-free-spoto-latest-ccna-200-301-practice-tests-2020_2348.html\">Download Free SPOTO Latest CCNA 200-301 Practice Tests 2020<\/a><\/h4>\n<h3><span class=\"ez-toc-section\" id=\"OSPF_network_hierarchy\"><\/span><strong>OSPF network hierarchy:<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><span data-preserver-spaces=\"true\">OSPF is a hierarchical routing protocol. Since the entire network is divided into smaller areas, better management and smaller routing tables can be achieved. OSPF is formed by a backbone (area 0) network that links all other smaller areas in the hierarchy. Some essential components of an OSPF network are as follows:<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">\u2022Area<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">\u2022Area border router<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">\u2022 Backbone area<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">\u2022AS border router<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">\u2022 Stub area<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">\u2022 Not-So-Stubby areas<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">\u2022 Totally Stubby area<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">\u2022Transit area<\/span><\/p>\n<p><img loading=\"lazy\" class=\"alignnone\" src=\"https:\/\/www.simulationexams.com\/tutorials\/ccna\/images\/ospf-r1.gif\" alt=\"ccna tutorial image\" width=\"559\" height=\"206\" \/><\/p>\n<p><span data-preserver-spaces=\"true\"><strong>ABR:<\/strong> Area Border Router<\/span><\/p>\n<p><span data-preserver-spaces=\"true\"><strong>ASBR:<\/strong> Autonomous System Border Router<\/span><\/p>\n<p><span data-preserver-spaces=\"true\"><strong>Area:<\/strong> The area composed of routers grouped by management. Generally, an area is a collection of contiguous IP subnet networks. A router entirely in an area is called an internal router. All interfaces on the internal router are directly connected to the network in the area.<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">In an area, all routers have the same topology database.<\/span><\/p>\n<p><strong><span data-preserver-spaces=\"true\">Area border router:<\/span><\/strong><span data-preserver-spaces=\"true\">\u00a0A router belonging to multiple areas is called an area border router (ABR). ABR maintains a separate topology database for each area to which they are connected.<\/span><\/p>\n<p><strong><span data-preserver-spaces=\"true\">Backbone area:<\/span><\/strong><span data-preserver-spaces=\"true\">\u00a0The OSPF backbone area consists of all routers in area 0 and all area border routers (ABR). The backbone network distributes routing information between different areas.<\/span><\/p>\n<p><span data-preserver-spaces=\"true\"><strong>AS Border Router (ASBR)<\/strong>: The router that exchanges routing information with routers in other autonomous systems are called ASBR. They publish externally learned routes throughout the autonomous system.<\/span><\/p>\n<p><strong><span data-preserver-spaces=\"true\">Stub area:<\/span><\/strong><span data-preserver-spaces=\"true\">\u00a0The stub area is an area where AS external advertisements are not spread. By not disseminating AS external advertisements, the topology database&#8217;s size can be reduced on the internal routers in the stub area. This, in turn, reduces the processing power and memory requirements of the internal routers.<\/span><\/p>\n<p><img src=\"https:\/\/www.simulationexams.com\/tutorials\/ccna\/images\/ospf-r2.gif\" alt=\"ccna tutorial image\" \/><\/p>\n<p><span data-preserver-spaces=\"true\"><strong>Not-So-Stubby Areas (NSSA)<\/strong>: There are no external routes in the OSPF stub area. NSSA allows external routes to flood in the area. These routes then leak to other areas. This feature is useful when you connect a non-OSPF router to the ASBR of NSSA. The route was introduced and flooded the entire area. However, external routes from other areas will still not enter the NSSA.<\/span><\/p>\n<p><img src=\"https:\/\/www.simulationexams.com\/tutorials\/ccna\/images\/ospf-r3.gif\" alt=\"ccna tutorial image\" \/><\/p>\n<p><strong><span data-preserver-spaces=\"true\">Totally Stubby Area:<\/span><\/strong><span data-preserver-spaces=\"true\">\u00a0Only the default summary route is allowed in the Totally Stubby Area.<\/span><\/p>\n<p><strong><span data-preserver-spaces=\"true\">Transfer area:<\/span><\/strong><span data-preserver-spaces=\"true\">\u00a0The transfer area is used to transfer traffic from adjacent areas to the backbone network. Traffic neither originates from the destination of transportation nor is it the destination of transportation.<\/span><\/p>\n<p><strong>Link State Advertisement (LSA):<\/strong><\/p>\n<p><span data-preserver-spaces=\"true\">It is important to understand the different link state advertisements (LSAs) provided by the OSPF protocol.<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">Type 1: Router link advertisements generated by each router for each area to which it belongs. Type 1 LSA floods only to a single area.<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">Type 2: A network link announcement generated by a designated router (DR) gives a group of routers connected to a specific network. Type 2 LSA floods to the area containing the network.<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">Type 3\/4: These are summary link advertisements generated by ABR, describing inter-area routes. Type 3 describes the route to the network for summarization.<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">Type 4 describes the route to the ASBR.<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">Type 5: Generated by ASBR and provide links to the outside of the autonomous system (AS). Type 5 LSA floods to all areas except the stub area and the full stub area.<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">Type 6: Group membership link entries generated by the multicast OSPF router.<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">Type 7: NSSA external route generated by ASBR. Only flooding to NSSA. Before flooding them to the backbone network (area 0), the ABR converts LSA type 7 to LSA type 5.<\/span><\/p>\n<table class=\"table table-bordered\">\n<tbody>\n<tr>\n<td><strong>Area<\/strong><\/td>\n<td><strong>Restriction<\/strong><\/td>\n<\/tr>\n<tr>\n<td>Normal<\/td>\n<td>None<\/td>\n<\/tr>\n<tr>\n<td>Stub<\/td>\n<td>Type 5 AS-external LSA NOT allowed<\/td>\n<\/tr>\n<tr>\n<td>NSSA<\/td>\n<td>Type 5 AS-external LSAs are NOT allowed, but Type 7 LSAs that convert to Type 5 at the NSSA ABR can traverse<\/td>\n<\/tr>\n<tr>\n<td>Totally Stubby<\/td>\n<td>Type 3, 4 or 5 LSAs are NOT allowed except the default summary route<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><span class=\"ez-toc-section\" id=\"In_conclusion\"><\/span><strong>In conclusion<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>OSPF is a technical point in the CCNA exam, if you want to learn about OSPF and pass the CCNA exam on the first try, you should opt for SPOTO <em><strong><a href=\"https:\/\/cciedump.spoto.net\/200-301-certificates.php\">100% real CCNA exam dumps<\/a><\/strong><\/em> &amp; <em><strong><a href=\"https:\/\/cciedump.spoto.net\/blog\/breaking-news-spoto-special-sale-new-training-course-coming-soon-in-nov_2532.html\">training course<\/a><\/strong><\/em> for 100% pass! 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Get now!<\/p>\n<figure class=\"wp-block-image is-resized\"><a href=\"https:\/\/tb.53kf.com\/code\/client\/10172212\/1?custom_channel=chenjia\" rel=\"nofollow\"><img loading=\"lazy\" class=\"alignnone wp-image-1863\" src=\"https:\/\/cciedump.spoto.net\/blog\/wp-content\/uploads\/2020\/08\/get-100-real-dump.gif\" alt=\"get 100% real dumps\" width=\"397\" height=\"115\" \/><\/a><\/figure>\n<h2><span class=\"ez-toc-section\" id=\"Latest_passing_report-100_pass_guarantee\"><\/span><strong>Latest passing report-100% pass guarantee<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<style id=\"bwg-style-0\">    #bwg_container1_0 #bwg_container2_0 .bwg-container-0.bwg-standard-thumbnails {      width: 1254px;              justify-content: center;        margin:0 auto !important;              background-color: rgba(255, 255, 255, 0.00);            padding-left: 4px;      padding-top: 4px;      max-width: 100%;            }        #bwg_container1_0 #bwg_container2_0 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Also, buy CCNA exam dumps now can save more due to the Black Friday Discount! Get now!<\/p>\n","protected":false},"author":1,"featured_media":2657,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[3],"tags":[392,647,158,648],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v18.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>OSPF Routing Fundamentals You Must Know in CCNA Exam! - SPOTO Official Blog<\/title>\n<meta name=\"description\" content=\"Learn about OSPF routing fundamentals, including advantages, disadvantages, network hierarchy, and more. 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