Wireless Network Installation Considerations
Summary
PDF p.248Ensuring good availability of authorized Wi-Fi access points is crucial to prevent vulnerabilities like rogue and evil twin attacks. Proper placement and configuration of Wireless Access Points (WAPs) are essential for optimal performance and security.
In plain words
Supplementary — not from your PDFGood Wi-Fi coverage from authorized access points reduces the temptation of rogue APs and helps you spot evil twins. Each AP has a network name (SSID) and a MAC identifier (BSSID). The 5 GHz band has more non-overlapping channels than 2.4 GHz. A site survey measures signal strength and channel use across the area, and a heat map visualizes the results so APs can be placed for full coverage with minimal overlap.
Detailed explanation
PDF p.248- 5 GHz Band: Offers more nonoverlapping channels compared to the 2.4 GHz band, reducing interference but potentially increasing risks when using bonded channels for higher bandwidth.
- WAP Placement: Involves connecting WAPs to a wired network, each identified by a MAC address (BSSID) and a network name (SSID). Proper channel configuration is necessary to minimize interference.
Site Surveys and Heat Maps
- Site Survey: Measures signal strength and channel usage across the area to ensure comprehensive coverage with minimal overlap. It starts with an architectural map highlighting interference sources like walls and electronic devices.
- Heat Maps: Visual representations of signal strength and channel usage, created from site survey data. They help optimize WAP placement by adjusting transmit power, changing channels, adding new WAPs, or relocating existing ones.
Important terms
taken from the text above- 5 GHz Band
- Offers more nonoverlapping channels compared to the 2.4 GHz band, reducing interference but potentially increasing risks when using bonded channels for higher bandwidth.
- WAP Placement
- Involves connecting WAPs to a wired network, each identified by a MAC address (BSSID) and a network name (SSID). Proper channel configuration is necessary to minimize interference.
- Site Survey
- Measures signal strength and channel usage across the area to ensure comprehensive coverage with minimal overlap. It starts with an architectural map highlighting interference sources like walls and electronic devices.
- Heat Maps
- Visual representations of signal strength and channel usage, created from site survey data. They help optimize WAP placement by adjusting transmit power, changing channels, adding new WAPs, or relocating existing ones.
Examples & real-world scenarios
Supplementary — not from your PDF- A site survey before installing APs in a new office.
- A heat map showing a weak-signal dead zone in a meeting room.
- Choosing non-overlapping channels for neighbouring APs.
Scenario
Staff in one corner of the office get poor Wi-Fi and someone plugs in their own consumer AP. A site survey and an added authorized AP fix coverage and remove the reason for the rogue device.
Common mistakes
Supplementary — not from your PDF- Mixing up SSID (network name) and BSSID (the AP's MAC).
- Placing APs by guesswork instead of a survey.
Practical skills
Supplementary — not from your PDF- Read a Wi-Fi heat map and suggest AP changes.
What I should remember
Key Points PDF p.248-
WAP Placement
- Identify WAPs: By MAC address (BSSID) and network name (SSID).
- Channel Configuration: Use widely spaced channels to reduce interference.
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Site Surveys
- Architectural Map: Mark interference sources.
- Wi-Fi Analyzer: Use a device with analyzer software to record signal strength.
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Heat Maps
- Visualize Signal Strength: Strong (green/blue) to weak (red).
- Optimize Design: Adjust power, change channels, add/move WAPs.