Chapter 8: Introducing Wireless Networks
Describing the purpose and functions of wireless networks
Describing the standards associated with wireless media
Identifying and describing the purpose of the components in wireless networks
Comparing and contrasting wireless security features and capabilities
Wireless networks are short- or medium-range networks that connect host devices using airwaves (radio) instead of cables. Wireless connections exist in a large variety of applications both for LAN and WAN connections.
Wireless LAN (WLAN)
Probably the most familiar and common wireless networking standard is the IEEE 802.11 wireless fidelity standard for LAN wireless connection. The IEEE 802.11 standard, also known as Wi-Fi, defines a blueprint and implementation specification to implement short-range, high-speed wireless connections. The CCNA exam focuses on LAN wireless connections, so it’s important to understand wireless LANs.
In terms of WAN applications, wireless connections are used for moderate ranges of up to 20 miles. Several technologies exist, some of which can concentrate the airwave signals into a directional beam, thereby increasing range. Microwave transmission is a form of wireless connection that can span very long distances, either on earth or through telecommunication satellites. Wireless WANs are beyond the scope of the CCNA exam.
Benefits and Costs of Wireless Networks
The main advantage of wireless LANs is the elimination of wired ...