{"id":167,"date":"2015-09-02T21:06:02","date_gmt":"2015-09-02T21:06:02","guid":{"rendered":"http:\/\/wiki.thomasandsofia.com\/?p=167"},"modified":"2016-12-02T11:44:37","modified_gmt":"2016-12-02T11:44:37","slug":"ccent-4-s01-e16-wireless-understanding-wireless","status":"publish","type":"post","link":"https:\/\/wiki.thomasandsofia.com\/?p=167","title":{"rendered":"CCENT 4 S01 E16 \u2013 Wireless: Understanding Wireless"},"content":{"rendered":"<h3>Types of Wireless Networks<\/h3>\n<ul>\n<li>PAN: Personal Area Network &#8211; Wireless Mouse, Bluetooth, very short distance<\/li>\n<li>LAN: Local Area Network &#8211; replace or suppliment your wired LAN<\/li>\n<li>MAN: Metropolitan Area Network &#8211; Uses Point to Point Wireless Bridges to allow network to extend several miles.<\/li>\n<li>WAN: Wide Area Network &#8211; Cellular.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Wireless LAN Facts<\/h3>\n<ul>\n<li>Wireless Access Points (WAP) communicate like a Hub\n<ul>\n<li>Shared Signal<\/li>\n<li>Half Duplex<\/li>\n<\/ul>\n<\/li>\n<li>Use &#8220;Unlicensed&#8221; bands of Radio Frequency (RF)<\/li>\n<li>Is both a Physical and Data Link Standard<\/li>\n<li>Uses CSMA\/CA Instead of CSMA\/CD: Carrier Sense Multiple Access\/Collision Avoidance vs Collision Detection (Sends request to send before sending)<\/li>\n<li>Faces connectivity issues because of interference &#8211; Susceptible to neighbors, appliances, etc.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Unlicensed Frequencies<\/h3>\n<p>These are basically worldwide ranges. While these ranges are available for free use, &#8220;hogging&#8221; the bandwidth is illegal.<br \/>\nLower frequencies get longer range, but slower bandwidth.<br \/>\nHigher frequencies get shorter range, but greater bandwidth.<\/p>\n<ul>\n<li>900 MHz Range: 902 &#8211; 928<\/li>\n<li>2.4 GHz Range: 2.400 &#8211; 2.483<\/li>\n<li>5 GHz Range: 5.150 &#8211; 5.350<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Understanding RF<\/h3>\n<p><a href=\"http:\/\/wiki.thomasandsofia.com\/wp-content\/uploads\/2015\/09\/wirelessbgchannels.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-173\" src=\"http:\/\/wiki.thomasandsofia.com\/wp-content\/uploads\/2015\/09\/wirelessbgchannels.jpg\" alt=\"wirelessbgchannels\" width=\"800\" height=\"359\" srcset=\"https:\/\/wiki.thomasandsofia.com\/wp-content\/uploads\/2015\/09\/wirelessbgchannels.jpg 800w, https:\/\/wiki.thomasandsofia.com\/wp-content\/uploads\/2015\/09\/wirelessbgchannels-300x135.jpg 300w, https:\/\/wiki.thomasandsofia.com\/wp-content\/uploads\/2015\/09\/wirelessbgchannels-150x67.jpg 150w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/a><\/p>\n<ul>\n<li>RF waves are absorbed (passing through walls) or reflected (by metal).<\/li>\n<li>Higher data rates have shorter ranges.\u00a0 (The closer you are, the faster you can send)<\/li>\n<li>Higher frequencies (RF) have higher data rates (bandwidth)<\/li>\n<li>Higher frequencies (RF) have higher data rates (bandwidth)<\/li>\n<li>Each channel is 5 MHz apart and 22 MHz wide.<\/li>\n<li>Only channels 1, 6 and 11 are &#8216;clean&#8217; and do not overlap each other.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>The 802.11 Line Up<\/h3>\n<p>802.11B (2.4 GHz)<\/p>\n<ul>\n<li>Official as of Sept. 1999<\/li>\n<li>Up to 11 Mbps (1, 2, 5.5, 11 Data Rates)<\/li>\n<li>Most popular standard<\/li>\n<li>Three &#8216;clean&#8217; channels<\/li>\n<li>Won out over .11A due to manufacturing issues.<\/li>\n<\/ul>\n<p>802.11G (2.4 GHz)<\/p>\n<ul>\n<li>Offical as of June, 2003<\/li>\n<li>Backwards compatible with 802.11B<\/li>\n<li>Up to 54 Mbps (12 Data Rates)<\/li>\n<li>Three &#8216;clean&#8217; channels<\/li>\n<\/ul>\n<p>802.11A (5.8 GHz)<\/p>\n<ul>\n<li>Official as of Sept. 1999<\/li>\n<li>Up to 54 Mbps<\/li>\n<li>Not cross compatible with 802.11B\/G<\/li>\n<li>12 &#8211; 23 &#8216;clean&#8217; channels<\/li>\n<\/ul>\n<p>802.11N (2.4 &amp; 5.8 GHz)<\/p>\n<ul>\n<li>Official as of Oct., 2009<\/li>\n<li>100+ Mbps<\/li>\n<li>Uses MIMO (Multiple Inputs, Multiple Outputs)<\/li>\n<li>Multiple antennas<\/li>\n<\/ul>\n<h3>Designing Your Wireless Coverage<\/h3>\n<p><a href=\"http:\/\/wiki.thomasandsofia.com\/wp-content\/uploads\/2015\/09\/wifichannels.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-176\" src=\"http:\/\/wiki.thomasandsofia.com\/wp-content\/uploads\/2015\/09\/wifichannels.png\" alt=\"wifichannels\" width=\"603\" height=\"438\" srcset=\"https:\/\/wiki.thomasandsofia.com\/wp-content\/uploads\/2015\/09\/wifichannels.png 603w, https:\/\/wiki.thomasandsofia.com\/wp-content\/uploads\/2015\/09\/wifichannels-300x218.png 300w, https:\/\/wiki.thomasandsofia.com\/wp-content\/uploads\/2015\/09\/wifichannels-150x109.png 150w\" sizes=\"auto, (max-width: 603px) 100vw, 603px\" \/><\/a><\/p>\n<p>Wireless Ranges = ~300&#8242; (150&#8242; Radius)<\/p>\n<p>&nbsp;<\/p>\n<h3>The Powers Over the Wireless World<\/h3>\n<p>International Telecommunication Union &#8211; Radio Sector (ITU-R)<\/p>\n<ul>\n<li>Regulate the radio frequencies used for wireless transmission.<\/li>\n<\/ul>\n<p>Institute of Electrical and Electronic Engineers (IEEE)<\/p>\n<ul>\n<li>Maintains the 802.11 wireless transmission standards<\/li>\n<\/ul>\n<p>Wi-Fi Alliance<\/p>\n<ul>\n<li>Ensures certified interoperability between 802.11 wireless vendors<\/li>\n<li>This makes sure products from different vendors work together seamlessly.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Types of Wireless Networks PAN: Personal Area Network &#8211; Wireless Mouse, Bluetooth, very short distance LAN: Local Area Network &#8211; replace or suppliment your wired LAN MAN: Metropolitan Area Network &#8211; Uses Point to Point Wireless Bridges to allow network to extend several miles. WAN: Wide Area Network &#8211; Cellular. &nbsp; Wireless LAN Facts Wireless ..<\/p>\n<div class=\"clear-fix\"><\/div>\n<p><a href=\"https:\/\/wiki.thomasandsofia.com\/?p=167\" title=\"read more...\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,2,4],"tags":[],"class_list":["post-167","post","type-post","status-publish","format-standard","hentry","category-ccent","category-networking","category-wireless"],"_links":{"self":[{"href":"https:\/\/wiki.thomasandsofia.com\/index.php?rest_route=\/wp\/v2\/posts\/167","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wiki.thomasandsofia.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wiki.thomasandsofia.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wiki.thomasandsofia.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/wiki.thomasandsofia.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=167"}],"version-history":[{"count":11,"href":"https:\/\/wiki.thomasandsofia.com\/index.php?rest_route=\/wp\/v2\/posts\/167\/revisions"}],"predecessor-version":[{"id":339,"href":"https:\/\/wiki.thomasandsofia.com\/index.php?rest_route=\/wp\/v2\/posts\/167\/revisions\/339"}],"wp:attachment":[{"href":"https:\/\/wiki.thomasandsofia.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=167"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wiki.thomasandsofia.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=167"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wiki.thomasandsofia.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=167"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}