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Wireless Networking Standards

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CompTIA A+ 220-1201 & 220-1202

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1 Introduction & Exam Overview

About the CompTIA A+ Certification Exam Domains & Study Strategy

2 Core 1 Domain 1: Mobile Devices (13%)

Laptop Hardware & Components Laptop Features & Display Types Mobile Device Connectivity & Accessories Mobile Operating System Features Mobile Device Synchronization & Data Transfer

3 Core 1 Domain 2: Networking (23%)

TCP/IP Fundamentals & the OSI Model Common Ports & Protocols Wireless Networking Standards Network Hardware & Devices Network Configuration & Internet Connections Network Types & Topologies

4 Core 1 Domain 3: Hardware (25%)

Cables & Connectors RAM Types & Storage Devices Motherboards, CPUs & Power Supplies Printers & Multifunction Devices Peripheral Devices & Expansion Cards Network Cable Tools & Testing

5 Core 1 Domain 4: Virtualization & Cloud Computing (11%)

Virtualization Concepts Cloud Computing Models & Services Client-Side Virtualization in Practice

6 Core 1 Domain 5: Hardware & Network Troubleshooting (28%)

CompTIA Troubleshooting Methodology Hardware Troubleshooting Network Troubleshooting Printer Troubleshooting Display & Mobile Device Troubleshooting

7 Core 2 Domain 1: Operating Systems (28%)

Windows Editions & Features Windows Administrative Tools & Utilities Windows Command Line & PowerShell macOS & Linux Basics Windows Networking & File Sharing Windows Installation & Upgrade Methods

8 Core 2 Domain 2: Security (28%)

Physical & Logical Security Measures Malware Types & Threat Mitigation Wireless & Network Security Encryption & Data Protection

9 Core 2 Domain 3: Software Troubleshooting (23%)

Windows OS Troubleshooting Mobile OS & Application Troubleshooting Browser & Application Troubleshooting

10 Core 2 Domain 4: Operational Procedures (21%)

Documentation & Change Management Backup & Recovery Methods Safety & Environmental Procedures Scripting & Remote Access Technologies Privacy, Licensing & Organizational Policies

Wireless Networking Standards

Key Takeaways Explain This Topic AI

Wi-Fi 6 (802.11ax) runs on 2.4 GHz and 5 GHz (6E adds 6 GHz) at up to ~9.6 Gbps and adds OFDMA and uplink MU-MIMO for dense environments.

2.4 GHz reaches farther and penetrates walls better but offers only three non-overlapping channels (1, 6, 11) and is crowded with interference.

5 GHz is faster with many non-overlapping channels but has shorter range; 6 GHz (Wi-Fi 6E/7) is fastest with the least congestion.

WPA3 is the current standard; it replaces the WPA2 PSK handshake with SAE for resistance to offline dictionary attacks and adds forward secrecy.

Place access points centrally and high, keep ~15-20% cell overlap for roaming, and put adjacent APs on different non-overlapping channels.

Last updated: June 2026

Wi-Fi Standards (IEEE 802.11)

The IEEE 802.11 family defines wireless LAN behavior. CompTIA expects you to recognize each standard's band, ceiling speed, and marketing name on sight.

  • Standard Wi-Fi name Band(s) Max speed Year
  • 802.11a - 5 GHz 54 Mbps 1999
  • 802.11b - 2.4 GHz 11 Mbps 1999
  • 802.11g - 2.4 GHz 54 Mbps 2003
  • 802.11n Wi-Fi 4 2.4 / 5 GHz 600 Mbps 2009
  • 802.11ac Wi-Fi 5 5 GHz only ~6.9 Gbps 2013
  • 802.11ax Wi-Fi 6 / 6E 2.4 / 5 / 6 GHz ~9.6 Gbps 2019/2021

Exam tell: if a question says a device "works on 2.4 GHz only," it is b, g, or n on that radio. If it says "5 GHz only," the answer is almost always 802.11ac (Wi-Fi 5). 802.11n and 802.11ax are the dual-band options.

Performance technologies

  • Feature Introduced Purpose
  • MIMO Wi-Fi 4 Multiple antennas, multiple spatial streams
  • MU-MIMO Wi-Fi 5 Serve several clients in the same airtime
  • OFDMA Wi-Fi 6 Split a channel into sub-carriers for many small flows
  • Beamforming Wi-Fi 5 Steer the signal toward the client
  • TWT Wi-Fi 6 Scheduled wake times to save IoT battery
  • Frequency Bands
  • 2.4 GHz
  • Trait Detail
  • Range Longest; best through walls
  • Speed Lowest of the three bands
  • Channels 11 in the US; only 1, 6, 11 do not overlap
  • Interference High - microwaves, Bluetooth, cordless phones, baby monitors
  • Best for IoT, far-from-AP devices, basic browsing
  • 5 GHz
  • Trait Detail
  • Range Shorter; weaker wall penetration
  • Speed High
  • Channels 20+ non-overlapping channels
  • Interference Lower than 2.4 GHz
  • Best for Streaming, gaming, large file transfers near the AP
  • 6 GHz (Wi-Fi 6E / Wi-Fi 7)

The 6 GHz band adds many wide (up to 160 MHz) channels with almost no legacy congestion, ideal for AR/VR and dense offices - at the cost of the shortest range. Only 6E/7 clients can use it.

Wireless Security Protocols

Know this progression from weakest to strongest - questions frequently ask which protocol to avoid and which to deploy now .

  • Protocol Cipher Key management Verdict
  • WEP RC4 Static key Broken; never use
  • WPA TKIP (RC4) Dynamic key Deprecated
  • WPA2-Personal AES-CCMP Pre-shared key (PSK) Strong, still common
  • WPA2-Enterprise AES-CCMP 802.1X / RADIUS Very strong
  • WPA3-Personal AES-GCMP SAE Current standard
  • WPA3-Enterprise 192-bit AES 802.1X / RADIUS Strongest
  • Why WPA3 beats WPA2

SAE (Simultaneous Authentication of Equals) replaces the PSK 4-way handshake and blocks offline dictionary attacks on captured handshakes.

Forward secrecy means a later password compromise cannot decrypt previously captured sessions.

Enhanced Open (OWE) encrypts traffic on open guest networks without a password.

802.1X/RADIUS ties enterprise logins to individual user credentials, so revoking one account does not require changing a shared key.

  • Wireless Configuration
  • SSID (Service Set Identifier)

The broadcast network name, up to 32 characters.

Hiding the SSID is not real security - scanners still see it; it only declutters the network list.

Channel selection

2.4 GHz: pick 1, 6, or 11 to avoid co-channel interference.

5/6 GHz: pick any clear non-overlapping channel; a Wi-Fi analyzer shows the least-used one.

Access point placement

Mount centrally and high (ceiling) for even coverage.

Keep 15-20% cell overlap so clients roam without dropping.

Set adjacent APs to different non-overlapping channels so they do not interfere.

Avoid microwaves, large metal objects, and water pipes that attenuate signal.

Choosing a Band in Practice

Dual-band routers let clients pick 2.4 GHz or 5 GHz, and the exam tests when each is correct. The trade-off is range versus throughput: lower frequencies travel farther and bend around walls, while higher frequencies carry more data but fade quickly. A smart thermostat in a far bedroom belongs on 2.4 GHz, where its modest bandwidth need is easily met and the longer range keeps it connected. A laptop streaming 4K video in the same room as the access point belongs on 5 GHz or 6 GHz, where the extra channels and width deliver the speed without contending with microwaves and Bluetooth.

Many vendors call automatic steering between bands band steering , but candidates should still understand the manual logic behind it.

Interference, Channels, and Overlap

The reason only channels 1, 6, and 11 are usable together in the 2.4 GHz band is that each Wi-Fi channel is about 20 MHz wide while channels are spaced only 5 MHz apart, so adjacent channels overlap and bleed energy into each other. Two access points on channels 1 and 3 will interfere; two on channels 1 and 6 will not. This is co-channel and adjacent-channel interference , and a Wi-Fi analyzer app visualizes it as overlapping bell curves on a spectrum chart.

In a multi-floor office, a tech assigns 1, 6, and 11 in a repeating pattern so no two neighboring cells share or overlap a channel, the same way a cellular network reuses frequencies.

A Wireless Security Scenario

A small business reports that guests on the open lobby Wi-Fi can see each other's traffic and that the back-office network shares the same password printed on a sticker. Two fixes apply. First, move the staff network to WPA3-Personal (or WPA2 if hardware is older) with a strong passphrase that is not posted publicly, because a shared, visible key is effectively no security. Second, enable WPA3 Enhanced Open (OWE) on the guest network so each guest's traffic is individually encrypted even without a password, and place guests on a separate VLAN/SSID so they cannot reach internal resources.

The exam rewards recognizing that hiding the SSID or shortening lease times does nothing to fix weak encryption.