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4.9.2.3 Wireless networking.md

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Networking

Explain the purpose of WiFi.

  • A wireless local area network that is based on international standards.
  • Used to enable devices to connect to a network wirelessly.

Be familiar with the components required for wireless networking.

Wireless network adapter.

  • A device that enables devices to connect to a network wirelessly

Wireless access point

  • Device that allows a Wi-Fi compliant device to connect to a wired network

Be familiar with how wireless networks are secured.

  • Strong encryption of transmitted data using WPA (WiFi Protected Access)/WPA2

  • SSID (Service Set Identifier) broadcast disabled - can be seen as a security weakness.

  • MAC (Media Access Control) address white list

Explain the wireless protocol Carrier Sense Multiple Access with Collision Avoidance (CSMA/ CA) with and without Request to Send/Clear to Send (RTS/CTS).

  • CSMA/CA with RTS/CTS
  1. Request to send
  2. Check if channel idle
  3. No - wait arbitrary amount of time
  4. Yes - transmit data
  • CSMA/CA without RTS/CTS
  1. Request to send
  2. Clear to send

Be familiar with the purpose of Service Set Identifier (SSID).

Service Set Identifier (SSID).

  • Locally unique identifier for a wireless network
  • A wireless client must have the same SSD as the one entered in the access point to join

Additional information

  • CSMA/CA without RTS/CTS prevents the effect of hidden nodes