Now there are few characteristics unique to wireless

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Now, there are few characteristics unique to wireless networks that you need to be aware of. The first is what's called the SSID, or the Service Set Identifier. SSID 2:05-2:35 The SSID is configured on the wireless access point, and is used to identify a wireless network. For example, this access point can be configured with an SSID of Coffee Shop Wi-Fi, and wireless devices that are in range of this access point would see Coffee Shop Wi-Fi as an available wireless network. The SSID is essentially the name of the wireless network, and helps differentiate the access point from other access points. It's also used when configuring wireless devices. Another characteristic is the standard that the wireless network uses to communicate. IEEE 802.11 Specification 2:36-4:05 Remember, wireless networks use radio waves to communicate, and radio waves come in a lot of different forms. Because of this, a group known as the Institute of Electrical and Electronics Engineers, or IEEE, got together and created the IEEE 802.11 specification, which is used to define the standards and characteristics of wireless networks. Over the years, the 802.11 specification has been improved upon, and different versions have been released. These versions are identified by appending a letter to the 802.11 specification. For example, the 802.11g specification is the third version of the 802.11 specification. 802.11ac was created in 2013, and is one of the more recent iterations. Each new 802.11 standard that is released typically improves on the previous version in speed,efficiency, and also security. In addition, each standard operates in a specific frequency. Depending on the standard, wireless networks can operate in either the 2.4 GHz frequency or the 5 GHz frequency. Knowing which frequency a wireless network operates in is important for several reasons. First, the other devices might use the same frequency and cause interference. Like a
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cordless phone, it can operate in 2.4 GHz frequency and can affect wireless communications. In addition, networks that operate in the 5 GHz frequency aren't compatible with devices that can only operate in the 2.4 GHz frequency, and vice versa. Transmission Speed and Distance 4:06-5:28 The 802.11 specification also identifies the transmission speed and distance specifications of a wireless network. Some of the original 802.11 specifications were actually very slow. For example, wireless networks using 802.11a had a maximum speed of 54 megabits per second. In today's networking world, that is astronomically slow. Luckily, newer specifications have implemented special techniques to achieve much faster transfer speeds. One such technique is called MIMO, which stands for multiple-input multiple-output. MIMO is a technique that uses up to eight antenna to create dedicated receive and send channels. For example, four antenna could be used only for sending, and the remaining four only for receiving.MIMO not only increases transmission speeds, but also the transmission distance. Older specifications use only one antenna, which could either send or receive, but not at the same time.
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