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CWNA-108 Real Exam Questions

Certified Wireless Network Administrator

181 questions available · Page 1 of 19

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Question 1 Single choice

What common feature of MDM solutions can be used to protect enterprise data on mobile devices?

  1. A

    Over-the-air registration

  2. B

    Onboarding

  3. C

    Containerization

  4. D

    Self-registration

Show answer and explanation

Correct answer: B

Question 2 Single choice

Which one of the following 802.11 PHYs is more likely to be used in an industrial deployment but not likely to be used in standard office deployments?

  1. A

    SIG

  2. B

    VHT

  3. C

    OFDM

  4. D

    HT

Show answer and explanation

Correct answer: B

Question 3 Single choice

You administer a WLAN that offers a guest SSID of GUESTNWORK. Users connect to the GUESTNWORK SSID, but report that they cannot browse the Internet. The devices simply report no Internet connection.

What common problem causes this scenario?

  1. A

    NTP issues

  2. B

    Hardware issues

  3. C

    IP routing issues

  4. D

    Captive portal issues

Show answer and explanation

Correct answer: C

Question 4 Single choice

802. 11ax (HE) introduces Resource Units that can be used to allow communications with multiple devices at the same time, on the same channel, in the same BSS.

What feature of 802.1 lax provides this functionality?

  1. A

    6 GHz support

  2. B

    TWT

  3. C

    Wi-Fi-LTE

  4. D

    OFDMA

Show answer and explanation

Correct answer: D

Explanation

The feature of 802.11ax (HE) that provides this functionality is OFDMA. OFDMA stands for Orthogonal Frequency Division Multiple Access and is a technology that allows multiple devices to communicate simultaneously on the same channel in the same BSS. OFDMA works by dividing a channel into smaller subchannels called Resource Units (RUs), which are composed of groups of subcarriers or tones. Each RU can be assigned to a different device based on its bandwidth requirement and signal quality. This way, OFDMA can increase the efficiency and capacity of the channel by reducing overhead, contention, and latency. OFDMA can also support both uplink and downlink multi-user transmissions using trigger frames and buffer status reports. 6 GHz support, TWT, and Wi-Fi-LTE are not features of 802.11ax that provide this functionality.
References:
[CWNP Certified Wireless Network Administrator Official Study Guide: Exam CWNA-107], page 226
[CWNA: Certified Wireless Network Administrator Official Study Guide: Exam
CWNA-106], page 216.

Question 5 Single choice

An 802.11-based network uses an AP and has several connecting clients. The clients include iPhones, iPads, laptops and one desktop.

What WLAN use case is represented?

  1. A

    WPAN

  2. B

    Ad-hoc

  3. C

    BSS

  4. D

    IBSS

Show answer and explanation

Correct answer: C

Question 6 Single choice

In WLAN security, what authentication method always creates Layer 2 dynamic encryption keys?

  1. A

    Shared Key

  2. B

    WEP

  3. C

    HTTPS captive portal

  4. D

    EAP-TLS

Show answer and explanation

Correct answer: B

Explanation

Reference
https://books.google.com.pk/books?id=0ZWLn57EdpsC&pg=PA142&lpg=PA142&dq=WLAN+security,
+what+authentication+method+always+creates+Layer+2+dynamic+encryption
+keys&source=bl&ots=CBgudPbaRh&sig=s7kLv2NeFqfjoBK6A_X- 9T2Nc0k&hl=en&sa=X&ved=0ahUKEwithMDooazZAhXMCuwKHfSNC-
kQ6AEIWTAH#v=onepage&q=WLAN%20security%2C%20what%20authentication%20method%

20always%20creates%20Layer%202%20dynamic%20encryption%20keys&f=false

Question 7 Single choice

ABC Company is planning a point-to-multipoint outdoor bridge deployment with standalone (autonomous) 802.11 bridge units. 802.1X/EAP will be used for bridge authentication. A Linux-based RADIUS server will be used for authentication.

What device in the bridge implementation acts as the 802.1X Authenticator?

  1. A

    The Ethernet switch

  2. B

    The RADIUS server

  3. C

    All non-root bridges

  4. D

    The root bridge

Show answer and explanation

Correct answer: D

Question 8 Single choice

When performing a validation survey for a Multiple Channel Architecture (MCA) system in a multi-tenant building with five floors, what aspect should you, as the surveyor, keep in mind?

  1. A

    The RF interference caused by passing airplanes supporting on-board Wi-Fi should be a prime

    consideration

  2. B

    The channel reuse pattern should be three dimensional with the RF cell extending coverage of each

    access point to other floors

  3. C

    The omni-directional antennas of the access points should be oriented parallel to the floor to maximize

    the coverage pattern across as many floors as possible

  4. D

    The Fresnel Zone is completely blocked between floors so each floor is considered a separate site

    survey

Show answer and explanation

Correct answer: B

Question 9 Single choice

When a client station sends a broadcast probe request frame with a wildcard SSID, how do APs respond?

  1. A

    For each probe request frame, only one AP may reply with a probe response.

  2. B

    Each AP responds in turn after preparing a probe response and winning contention.

  3. C

    Each AP checks with the DHCP server to see if it can respond and then acts accordingly.

  4. D

    After waiting a SIFS, all APs reply at the same time with a probe response.

Show answer and explanation

Correct answer: B

Question 10 Single choice

You recently purchased four laptops containing dual-band 802.11ac adapters. The laptops can connect to your 2.4 GHz network, but they cannot connect to the 5 GHz network. The laptops do not show the 5 GHz SSIDs, which are different than the 2.4 GHz SSIDs. Existing devices can connect to the 5 GHz SSIDs with no difficulty.

What is the likely problem?

  1. A

    Interference from non-Wi-Fi sources

  2. B

    Faulty drivers

  3. C

    DoS attack

  4. D

    Interference from other WLANs

Show answer and explanation

Correct answer: D