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.

For N10-009, the standards that matter most are 802.11n (Wi-Fi 4), 802.11ac (Wi-Fi 5), 802.11ax (Wi-Fi 6 and 6E), and 802.11be (Wi-Fi 7). 802.11a, b, and g show up as historical context but are not deployment-relevant today.

Standards, real numbers, and what they mean

Here is the table the exam tests, with the marketing fluff removed.

• 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 modern family. Often referenced for legacy support questions.
• 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. Up to several Gbps with wider channels and MU-MIMO downstream. The standard most existing fleets are running today.
• 802.11ax (Wi-Fi 6). 2.4 and 5 GHz. Adds OFDMA (more efficient air time), BSS coloring, and target wake time. Speed gains modest in the lab, dense-deployment gains huge.
• 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. Real-world ceilings into the tens of Gbps.

The three frequency bands and the tradeoffs

Frequency is the most testable wireless concept. 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 one of the easiest sets of points to grab on Net+ because the answers do not change much. Know what is current, what is deprecated, and what is dangerous.

• WEP. Wired Equivalent Privacy. Broken since the early 2000s. If you see it as an answer, it is wrong unless the question is asking what to remove.
• WPA. Stopgap upgrade from WEP. Also deprecated. Same rule as WEP for exam answers.
• 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 replaces PSK for stronger key exchange. Forward secrecy means a captured handshake does not decrypt later sessions. 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 testable fact and a real deployment rule.

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 2.4 covers every 802.11 revision plus the channel-and-band combinations the exam loves to mix and match. 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 empty because few clients have caught up. The exam tests the standards, not what the average buyer believes. Know what each revision actually 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.

LinkedIn ↗

R

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.