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CompTIA Network+ - Wireless Networking

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Question 1

?? Multiple Choice (Easy)

What is an SSID?

Answer choices

  • A. The unique hardware address of a wireless access point

  • B. The name of a wireless network that clients use to identify and connect to it (Correct)

  • C. The channel frequency used by the access point

  • D. The encryption key used to secure wireless connections

Explanation

SSID (Service Set Identifier) is the network name broadcast by a wireless access point (in beacon frames). Clients scan for SSIDs to discover available networks. SSIDs can be hidden (AP stops broadcasting SSID) but this provides minimal security — passive scanners can still discover hidden networks from client probe requests.

Question 2

?? Multiple Choice (Medium)

What causes co-channel interference in wireless networks?

Answer choices

  • A. Two access points using different non-overlapping channels

  • B. Multiple access points using the same channel in the same area (Correct)

  • C. A client device connecting to an AP on a different SSID

  • D. Power fluctuations from the access point's power supply

Explanation

Co-channel interference (CCI) occurs when nearby APs use the same channel — they "hear" each other's transmissions and must wait their turn (CSMA/CA), reducing throughput. Proper channel planning assigns non-overlapping channels to adjacent APs. Channel reuse across a larger area (further apart) is acceptable since the signal is too weak to cause interference.

Question 3

?? Multiple Choice (Easy)

What Wi-Fi standard is also known as 802.11ac?

Answer choices

  • A. Wi-Fi 4

  • B. Wi-Fi 5 (Correct)

  • C. Wi-Fi 6

  • D. Wi-Fi 6E

Explanation

IEEE 802.11 standard to Wi-Fi generation mapping: 802.11n = Wi-Fi 4; 802.11ac = Wi-Fi 5; 802.11ax = Wi-Fi 6 (also Wi-Fi 6E for 6 GHz); 802.11be = Wi-Fi 7. Wi-Fi 5 supports up to 3.5 Gbps theoretical maximum using 160 MHz channels and MU-MIMO on 5 GHz only.

Question 4

?? Multiple Choice (Medium)

What is the primary advantage of WPA3-Personal over WPA2-Personal?

Answer choices

  • A. WPA3 supports 2.4 GHz only

  • B. WPA3 uses Simultaneous Authentication of Equals (SAE), eliminating offline dictionary attacks against captured handshakes (Correct)

  • C. WPA3 allows longer passwords

  • D. WPA3 uses older but more compatible encryption methods

Explanation

WPA2-Personal uses a 4-way handshake vulnerable to offline dictionary attacks — capture the handshake once and try passwords at billions of guesses/second. WPA3 replaces PSK with SAE (Dragonfly handshake), providing forward secrecy and making each authentication attempt require interaction with the AP. Captured handshakes cannot be cracked offline.

Question 5

?? True/False (Hard)

The 802.1X standard provides a framework for port-based network access control used in both wired and wireless enterprise authentication.

Answer choices

  • A. True (Correct)

  • B. False

Explanation

802.1X is a port-based Network Access Control (NAC) standard. In wireless networks, it is used for WPA2/WPA3-Enterprise, where clients authenticate to a RADIUS server before gaining access. Components: Supplicant (client), Authenticator (AP or switch), Authentication Server (RADIUS). Protocols: EAP-TLS (certificate-based, most secure), PEAP, EAP-TTLS.