Skip to content
AvailabilitySign inBook a DemoJoin Waitlist
All CCNA topics

1.0 Network Infrastructure and Connectivity

Wireless RF & Security Practice Questions

Updated for CCNA v2.0

Band and channel selection, RF characteristics, WPA2 and WPA3, and causes of interference.

CCNA v2.0 objectives 1.5, 1.5.a, 1.5.b, 1.5.c, 1.5.d · objective map

Author-reviewed by LabFabric · 25 September 2026 · Report a content issue

One solved question, so you can see how these are marked

Which set of channels gives three non-overlapping 20 MHz channels in the 2.4 GHz band in North America?

1, 6 and 11

2.4 GHz channels are spaced 5 MHz apart but each is about 20 MHz wide, so only channels 1, 6 and 11 avoid overlap in North America. Channels 36 and above are in the 5 GHz band.

Every question in the set below is marked like this. The answers stay hidden until you pick one.

Find related practice in the CCNA path
All 10 Wireless RF & Security questions in this set

Answers and explanations appear when you work through the set above.

  1. Compared with 2.4 GHz, what is a typical advantage of the 5 GHz band?

    • More non-overlapping channels and usually less interference
    • Better penetration through walls
    • A longer range at the same power
    • Compatibility with every legacy device

  2. Which frequency band was added for Wi-Fi 6E?

    • 6 GHz
    • 900 MHz
    • 60 GHz only
    • 3.5 GHz

  3. Which unit is normally used to report the received signal strength at a wireless client?

    • dBm
    • MHz
    • Mb/s
    • ohms

  4. What does the signal-to-noise ratio (SNR) measure?

    • The difference between the received signal power and the noise floor
    • The distance to the nearest access point
    • The number of clients on a channel
    • The encryption strength

  5. Which of these is a common source of interference in the 2.4 GHz band?

    • A microwave oven
    • A fiber optic cable
    • A console cable
    • A PoE switch

  6. Two neighbouring access points are both set to channel 6 and clients on each slow the other down. What is this called?

    • Co-channel interference
    • Adjacent channel attenuation
    • Multipath fading
    • Signal reflection loss

  7. Which WPA3 feature replaces the PSK-based authentication and key establishment of WPA2-Personal and resists offline dictionary attacks?

    • Simultaneous Authentication of Equals (SAE)
    • TKIP
    • WEP
    • MAC filtering

  8. Which encryption cipher does WPA2 use with AES?

    • CCMP
    • TKIP
    • RC4
    • Kerberos

  9. What is the effect of using wider channels, such as 80 MHz, in a dense 5 GHz deployment?

    • Higher peak throughput, but fewer non-overlapping channels and more co-channel interference
    • More channels and less interference
    • Better range at the same power
    • No effect on throughput

  10. Which security type is best for a corporate WLAN where each user has an individual credential?

    • WPA2 or WPA3 Enterprise with 802.1X and a RADIUS server
    • WPA2 Personal with a shared passphrase
    • Open with a captive portal
    • WEP with a long key