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Course 7: Wireless for CCNALesson 5.2 (15 of 15 in this course)70 of 132 in the CCNA series

Test: wireless

Twenty questions on the whole course, from RF numbers to AP modes and WPA3, each with an explanation.

Intermediate · 20 min read

What you will learn

After this lesson, you can check that you can read RF numbers, recognise standards, topologies and AP modes, and choose the right wireless security.

  • RF and dB
  • Standards and frames
  • Architectures and AP modes
  • Security

A WLAN (wireless LAN) connects devices over radio using the IEEE 802.11 standards. Access points, usually managed by a WLC, advertise SSIDs on channels in the 2.4, 5 and 6 GHz bands; clients authenticate, associate and then send encrypted frames that the AP bridges onto the wired network.

In simple terms: Access points turn the wired network into radio signals, and back again, with security so only the right people can use it.

Twenty questions on the whole course, using the lab network where it helps: AP1 in VLAN 30, WLC1 at 10.10.99.10, Staff WLAN in VLAN 10 with 802.1X, Guest WLAN in VLAN 20 with a PSK. If you get one wrong, the explanation names the lesson to go back to.

Predict · scenario 1

1. Which band has the longest range through walls?

Predict · scenario 2

2. Which three 2.4 GHz channels don't overlap (in most countries)?

Predict · scenario 3

3. An AP's power is raised from 25 mW to 50 mW. What is the change?

Predict · scenario 4

4. A radio sends 20 dBm, the cable loses 3 dB and the antenna has 5 dBi of gain. What is the EIRP?

Predict · scenario 5

5. RSSI is −70 dBm and the noise floor is −92 dBm. Is the SNR good enough for voice (target 25 dB)?

Predict · scenario 6

6. Metal shelving creates dead spots and multipath. Which RF effect is mainly responsible?

Predict · scenario 7

7. Which standard is Wi-Fi 6, and what feature lets it serve several clients in one transmission?

Predict · scenario 8

8. Which standards operate only in the 5 GHz band?

Predict · scenario 9

9. Which frame type is an ACK?

Predict · scenario 10

10. In what order does a client join a WPA2-Enterprise WLAN?

Predict · scenario 11

11. A wired-only lab instrument must join the Staff WLAN. Which device helps?

Predict · scenario 12

12. In a mesh, which AP is cabled to the wired network?

Predict · scenario 13

13. What does CAPWAP carry between a lightweight AP and its WLC?

Predict · scenario 14

14. Branch APs must keep serving staff if the WAN to the WLC fails. Which mode?

Predict · scenario 15

15. How is the switch port for a local-mode AP configured?

Predict · scenario 16

16. Which WLC setting decides which VLAN the Guest WLAN's clients land in?

Predict · scenario 17

17. How must the switch be configured for an AireOS WLC's LAG?

Predict · scenario 18

18. Which encryption does WPA2 use?

Predict · scenario 19

19. What does WPA3-Personal use instead of the WPA2 PSK exchange?

Predict · scenario 20

20. Staff logins fail on the Staff WLAN; Guest works. The RADIUS log shows requests from 10.10.99.10 rejected as an unknown client. Fix?