CWNP CWNA-108 Online Practice Questions and Exam Preparation

CWNP CWNA-108 Online Questions & Answers

• Question 1:

  Return Loss is the decrease of forward energy in a system when some of the power is being reflected back toward the transmitter.

  What will cause high return loss in an RF transmission system, including the radio, cables, connectors and antenna?

  A. The use of cables longer than one meter in the RF system
  B. High output power at the transmitter and use of a low-gain antenna
  C. A Voltage Standing Wave Ratio (VSWR) of 1:1
  D. An impedance mismatch between components in the RF system
  D. An impedance mismatch between components in the RF system

• Question 2:

  When a STA has authenticated to an AP (AP-1), but still maintains a connection with another AP (AP-2), what is the state of the STA on AP-1?

  A. Transitional
  B. Unauthenticated and Unassociated
  C. Authenticated and Unassociated
  D. Authenticated and Associated
  A. Transitional

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  Explanation/Reference:

  https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-1/Enterprise-Mobility-8-1-Design-Guide/ Enterprise_Mobility_8-1_Deployment_Guide/Chapter-11.pdf

• Question 3:

  When antenna gain is reported in dBI, the gain of the antenna is compared to what theoretical antenna?

  A. Yagl
  B. Dipole
  C. Rubber ducky
  D. Isotropic radiator
  D. Isotropic radiator

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  Explanation/Reference:

  https://www.cwnp.com/forums/posts?postNum=292616

• Question 4:

  What is an advantage of using WPA3-Personal instead of WPA2-Personal as a security solution for 802.11 networks?

  A. WPA3-Personal, also called WPA3-SAE, uses an authentication exchange and WPA2- Personal does not
  B. WPA3-Personal, also called WPA3-SAE, uses a stronger authentication exchange to better secure the network
  C. WPA3-Personal, also called WPA3-SAE, uses AES for encryption and WPA2-Personal does not
  D. WPA3-Personal, also called WPA3-SAE, uses a better encryption algorithm than WPA2- Personal
  B. WPA3-Personal, also called WPA3-SAE, uses a stronger authentication exchange to better secure the network

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  Explanation/Reference:

  An advantage of using WPA3-Personal instead of WPA2-Personal as a security solution for 802.11 networks is that WPA3-Personal, also called WPA3-SAE, uses a stronger authentication exchange to better secure the network. WPA3Personal uses Simultaneous Authentication of Equals (SAE) as the key exchange protocol, which provides stronger protection against offline dictionary attacks and password guessing than WPA2-Personal. SAE uses a Diffie-Hellman key

  exchange with elliptic curve cryptography (ECC) to establish a pairwise master key (PMK) between the AP and the client without revealing it to any eavesdropper. SAE also provides forward secrecy, which means that if one PMK is

  compromised, it does not affect the security of other PMKs. WPA2-Personal uses Pre- Shared Key (PSK) as the key exchange protocol, which is vulnerable to offline brute-force attacks if the passphrase is weak or leaked. Both WPA3Personal and WPA2-Personal use AES for encryption, so there is no difference in that aspect. WPA3- Personal does not use a different encryption algorithm than WPA2-Personal, but rather a different key exchange protocol. References:

  [CWNP Certified Wireless Network Administrator Official Study Guide:

  Exam CWNA-107], page 307; [CWNA: Certified Wireless Network Administrator Official Study Guide:

  Exam CWNA-106], page 297.

• Question 5:

  What statement about 802.11 WLAN bridges is true?

  A. WLAN bridges only work in the 2.4 GHz frequency band and they support only SISO communications
  B. WLAN bridges must use a channel with acceptable SNR at both transceivers to maintain the desired data rate bi-directionally
  C. WLAN bridges may support MIMO communications, but only if used in the 5 GHz frequency band
  D. WLAN bridges must be implemented such that no interference occurs on the channel anywhere between the two endpoints used to establish the bridge
  C. WLAN bridges may support MIMO communications, but only if used in the 5 GHz frequency band

• Question 6:

  You have received a report of poor wireless connections on the third floor of a building under your administration. Three individuals have reported the problem. Apparently, the connections are reporting a strong signal, but the users cannot access the Internet. With the problem identified, what is the next logical step in the troubleshooting process?

  A. Verify the solution
  B. Discover the scale of the problem
  C. Perform corrective actions
  D. Create a plan of action or escalate the problem
  B. Discover the scale of the problem

• Question 7:

  You are troubleshooting a WLAN problem and you suspect hidden node as the cause. What should you look for in a protocol analyzers?

  A. Frames with the HN bit set to 1
  B. Frames with the retry bit set to 0
  C. Frames transmitted from the AP without acknowledgement
  D. Retransmitted frames from multiple STAs at higher rates than other STAs
  D. Retransmitted frames from multiple STAs at higher rates than other STAs

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  Explanation/Reference:

  Reference http://setup-wireless.blogspot.com/2008/11/wireless-hidden-node.html

• Question 8:

  You are troubleshooting a client problem with a 2.4 GHz WLAN connection. The client is experiencing surprisingly low data rates during the work day. You analyze the workspace outside of business hours and detect a strong signal with a

  typical noise floor at the client location. During working hours, the user works with a laptop in the area and uses an external USB hard drive for continuous data access. The user also states that the laptop works as expected on her home

  network. The user working approximately 8 feet away from this client experiences no problems.

  Based on this information, what is the likely cause of the problem?

  A. The AP is overloaded during the work day
  B. The drivers in the laptop are corrupt
  C. The laptop has a failing wireless adapter
  D. The external hard drive is USB 3.0 and is causing a significant increase in the noise floor when in use
  D. The external hard drive is USB 3.0 and is causing a significant increase in the noise floor when in use

• Question 9:

  A POE device requires 47 W of power. What POE specification should be used?

  A. 802.3at
  B. 802.3af
  C. 802.3bt
  D. 802. 11at
  C. 802.3bt

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  Explanation/Reference:

  A POE device that requires 47 W of power should use the 802.3bt specification. This is because 802.3bt is the latest POE standard that supports up to 90 W of power delivery over four pairs of wires in an Ethernet cable. The previous POE standards, such as 802.3af and 802.3at, only support up to 15.4 W and 30 W of power delivery over two pairs of wires in an Ethernet cable, respectively. Therefore, they are not sufficient for powering a device that requires 47 W of power. The 802.11at specification does not exist; it is a typo or confusion with the 802.3at specification. References: CWNA-109 Study Guide, Chapter 8: Wireless LAN Access Points, page 2431

• Question 10:

  What cipher suite is specified by the 802.11-2016 standard and is not deprecated?

  A. Wired Equivalent Privacy
  B. Temporal Key Integrity Protocol
  C. Counter Mode with CBC-MAC Protocol
  D. Extensible Authentication Protocol
  C. Counter Mode with CBC-MAC Protocol