This article explains the difference between the currently popular IEEE wireless local-area network (WLAN) standard 802.11n and the forthcoming 802.11ac, which defines a faster version The 802.11 standard was first available in the late 1990s. It was not an immediate success. When the 11b version arrived in 1999, it facilitated the first widespread implementation of WLAN technology. The 802.11b standard is often considered the first generation, 802.11a is the second generation, 802.11g is the third generation, and 802.11n is the fourth generation. When 802.11ac becomes available this year, it will represent the fifth generation. Today, the most widely implemented form is 802.11n, which is used in access points, routers, laptops, smart phones, tablets, and other mobile devices. Devices using 11n are all backward compatible with older 802.11a/g equipment. The 802.11 standard defines both a physical layer (PHY) and media access control (MAC) layer in the networking scheme. While
Organization unit : OU can be used to segregate/filter department bases on the region or type of users/groups/computers. OU - Structures are included to make Administrator job easy. For eg- You have 2 office 1. Main office 2. Branch office , You want to separte users and computer accounts for respective location so that you can go ahead and manage them easily , then you need to create OU structure in AD and move the user accounts or computer acccounts respectively according to your need. Groups : Groups can be used to group to be able to apply permission instead of doing it one by one. Its easy to manage group then individual. Consider, you need to add 1000 users in a folder but instead of adding one by one, you can add a security group & later on you can modify group to add or remove users instead of going to folder & adding or removing it manually.
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