Wi-Fi 6, Wi-Fi 7, and what Net+ actually tests

What is the 802.11 family in plain terms

IEEE 802.11 is the family of wireless LAN standards. Each letter or letter pair is a revision. Wi-Fi Alliance marketing names (Wi-Fi 4, 5, 6, 6E, 7) map onto specific 802.11 revisions. Network Plus expects you to know both the marketing name and the underlying standard.

The revisions carrying the most weight today are 802.11n (Wi-Fi 4), 802.11ac (Wi-Fi 5), and 802.11ax (Wi-Fi 6 and 6E). 802.11be (Wi-Fi 7) is here because it is shipping in hardware now. 802.11a, b, and g are historical context rather than deployment choices. One honest caveat: CompTIA revises objectives on its own schedule, so pull the current N10-009 objectives PDF for the authoritative list instead of trusting a blog post, this one included.

Standards, real numbers, and what they mean

Here is the family, with the marketing fluff removed. Where a number is theoretical, it says so.

• 802.11a. 5 GHz only. Up to 54 Mbps. Historical, but useful to know existed.
• 802.11b. 2.4 GHz only. Up to 11 Mbps. Slowest of the family. Worth knowing because a single 802.11b client can drag a whole 2.4 GHz cell down to slower rates.
• 802.11g. 2.4 GHz only. Up to 54 Mbps. Backward compatible with b.
• 802.11n (Wi-Fi 4). 2.4 and 5 GHz. Up to 600 Mbps theoretical. Introduced MIMO (multiple-input multiple-output).
• 802.11ac (Wi-Fi 5). 5 GHz only. Theoretical maximum 6.9 Gbps, which assumes eight spatial streams and 160 MHz channels. MU-MIMO downstream only. The standard most existing fleets are running today.
• 802.11ax (Wi-Fi 6). 2.4 and 5 GHz. Theoretical maximum 9.6 Gbps, again across eight streams. Adds OFDMA (more efficient air time), BSS coloring, and target wake time. The single-client speed gain over 802.11ac is modest. The gain shows up where many clients share the same air.
• Wi-Fi 6E. 802.11ax extended into the 6 GHz band. Same protocol, new spectrum. The 6 GHz piece is what makes 6E different from plain Wi-Fi 6.
• 802.11be (Wi-Fi 7). 2.4, 5, and 6 GHz. 320 MHz channels in 6 GHz, 4096-QAM modulation, multi-link operation. The theoretical PHY maximum quoted for 802.11be is roughly 46 Gbps, and that number assumes 320 MHz channels, sixteen spatial streams, and radio conditions no office building has. A two-stream laptop on a clean 6 GHz link is more likely to land somewhere between a few hundred Mbps and low single-digit Gbps of measured throughput. Theoretical ceiling and measured throughput are two different numbers, which is the point of this whole post.

The three frequency bands and the tradeoffs

Frequency is the concept the rest of wireless hangs on. Lower frequency travels farther and penetrates walls better but carries less data and is more congested. Higher frequency carries more data and has less interference but does not travel as far.

• 2.4 GHz. Three non-overlapping channels in North America (1, 6, 11). Long range, good wall penetration, terrible congestion. Best for IoT and low-bandwidth devices that need to reach far corners of a building.
• 5 GHz. Many non-overlapping channels, 20/40/80/160 MHz widths. Faster but shorter range and weaker wall penetration. The main band for office and home throughput.
• 6 GHz. Even more channels, 20/40/80/160/320 MHz widths. Almost no legacy traffic. Wi-Fi 6E and Wi-Fi 7 only. Shortest range of the three, highest capacity.

Wider channels carry more data but also leave fewer non-overlapping channels to choose from. In 2.4 GHz, anything wider than 20 MHz cannibalizes the few channels you have. In 5 GHz and 6 GHz, you can afford 80 or 160 MHz channels because there is room.

Wireless security: what is alive, what is dead

Wireless security is a short list that has not moved much in years. Know what is current, what is deprecated, what is dangerous, and why in each case.

• WEP. Wired Equivalent Privacy. Broken since the early 2000s. If you find it running anywhere, the fix is removal, not reconfiguration.
• WPA. Stopgap upgrade from WEP, built on TKIP. Also deprecated. Same treatment as WEP.
• WPA2-PSK. Pre-shared key. Still common in homes and small offices. Acceptable for small environments but does not scale.
• WPA2-Enterprise. Uses 802.1X and a RADIUS server for per-user authentication. Standard for offices that want to revoke access without rotating a shared password.
• WPA3. Current standard. SAE (Simultaneous Authentication of Equals) replaces the WPA2 pre-shared key handshake, and it derives a fresh session key on each association. That is what forward secrecy means here, and it runs the opposite direction from how people usually say it: traffic someone captured last month stays unreadable even if the Wi-Fi password leaks today, because the password on its own does not reproduce the session keys. Under WPA2-PSK, an attacker holding a recorded handshake can decrypt that recorded session once the password turns up. WPA3-Enterprise is the enterprise variant.

Wi-Fi 6E and Wi-Fi 7 require WPA3 in 6 GHz. The Wi-Fi Alliance certification mandates it. That is a deployment rule, not a preference, so a 6 GHz SSID with WPA2 on it is a misconfiguration.

Real-world: a coffee shop and a warehouse

A coffee shop wireless redesign is mostly about the 5 GHz band. Twenty-five customers on laptops and phones, plus a point-of-sale tablet, plus the owner's office laptop. You stand up two SSIDs: a customer guest network on a separate VLAN, captive portal for terms of service, and a staff network on WPA2-Enterprise or WPA3-Enterprise. You set the 5 GHz band to a moderate channel width (40 or 80 MHz, not 160) so neighboring shops do not stomp on each other. 2.4 GHz on its own SSID for the few legacy devices that need it.

A warehouse is the opposite shape. Forklifts driving across a 60,000 square foot floor with scanners, plus 2.4 GHz interference from old equipment. You design for 2.4 GHz primarily for the scanners (range matters more than speed), and you minimize interference by surveying the floor for noise before placing access points. Channel reuse becomes the hard part. You use 1, 6, and 11 in a checkerboard pattern across the building so adjacent APs are not on the same channel.

What this looks like in our platform

The Study Mode deck for objective 2.3 covers the 802.11 revisions plus the channel-and-band combinations that get mixed up most often. The Help Desk Simulator has tickets where a user reports "Wi-Fi is slow" and your job is to figure out whether it is a band choice, a channel saturation, a security mismatch, or a dead access point. The Net+ track page shows where wireless fits.

The thing the marketing copy hides

Wi-Fi 7 routers will sell to homes that have no Wi-Fi 7 clients. Wi-Fi 6E in 6 GHz is quiet because few clients have caught up. What matters is the standard underneath, not the number on the box. Know what each revision delivers, what band it lives in, and what security it requires. The buzzwords will keep shifting. The pattern of "newer standard, more spectrum, stronger security, more efficient air time" holds across the family.

About the authors

Nick Miller

Founder and Lead Author

IT Service Center Manager and former CTE / IT teacher. Owner of Revtek IT Solutions. Writes everything that ships under his name and reviews every line of Revy-assisted drafting before publish.

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Revy

Study buddy · AI co-author

Revy helps draft and structure these posts. Every piece is reviewed, edited, and fact-checked by Nick before publish. We disclose this here because it is the right thing to do. See the AI Policy for the full stance.