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IEEE 802.11

As explained in Acing the CCNA Exam: Volume 2 Advanced Networking and Security

Wi-Fi is a trademarked industry designation for wireless LAN equipment and products that conform to interoperability certification requirements for IEEE 802.11.

IEEE 802.11 defines wireless LAN standards at TCP/IP Layers 1 and 2, specifying radio frequencies, signal encoding, frame formats, and wireless communication behavior over the air. section 18.1 section 19.1

Wi-Fi is the Wi-Fi Alliance trademark for equipment that passes interoperability certification against 802.11 requirements; IEEE does not use Wi-Fi as its official name. section 18.1

Recognize the major 802.11 generations and their radio-frequency bands:

  • 802.11 and 802.11b use 2.4 GHz; 802.11a uses 5 GHz; and 802.11g uses 2.4 GHz. section 18.2.3
  • 802.11n, marketed as Wi-Fi 4, supports 2.4 and 5 GHz; 802.11ac, marketed as Wi-Fi 5, uses 5 GHz. section 18.2.3
  • 802.11ax, marketed as Wi-Fi 6, supports 2.4 and 5 GHz; Wi-Fi 6E uses 6 GHz; 802.11be is Wi-Fi 7. section 18.2.3
  • Treat listed transfer rates as theoretical maximums: real performance is lower because wireless conditions and external factors affect throughput. section 18.2.3

Channel-selection exam scenario

Neighboring access points require careful channel selection in the overlapping 2.4 GHz band. The 1-6-11 or 1-5-9-13 patterns reduce interference; among the listed choices, 802.11b and 802.11g use that band. section 18.2.3

802.11 uses its own frame format and message types. Management frames establish and maintain communication, control frames coordinate delivery, and data frames carry client traffic. section 19.1 section 19.3

Clients discover access points through active scanning with probe requests and responses or passive scanning with beacons, then authenticate and associate before exchanging traffic. section 19.3

Table 18.1 IEEE 802.11 wireless LAN standards (view table figure)

802.11 standard

Wi-Fi generation

Maximum rate (Mbps)

RF band (GHz)

802.11

-

1–2

2.4

802.11b

-

1–11

2.4

802.11a

-

6–54

5

802.11g

-

6–54

2.4

802.11n

Wi-Fi 4

72–600

2.4/5

802.11ac

Wi-Fi 5

433–6933

5

802.11ax

Wi-Fi 6

574–9608

2.4/5

Wi-Fi 6E

6

802.11be

Wi-Fi 7

1376–46120

2.4/5/6

Compare 802.11 generations, marketed Wi-Fi names, theoretical rates, and RF bands in one reference table. section 18.2.3

How Acing the CCNA Exam: Volume 2 Advanced Networking and Security covers it

How deep it goes
Explains Layers 1 and 2, generations, bands, frames, scanning, and association, while deferring detailed configuration and security mechanisms.
Examples
Uses generation-to-band comparisons, overlapping-channel patterns, scanning exchanges, beacons, probes, authentication, and association.
What it assumes
Assumes basic TCP/IP layering and Ethernet familiarity while defining wireless LAN terminology, scanning, frames, and association.
What you can do after
Evaluate 802.11 standards, identify their RF bands, distinguish Wi-Fi certification, and reason about basic wireless discovery and association.
How it connects
Connects wireless LANs with Ethernet, access points, frames, radio-frequency bands, VLANs, authentication, and wireless security.
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