920-238 Exam

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Exam : Nortel 920-238
Title : Nortel WLAN 2300 Rls. 4.1 Implementation & Management


1. A customer wants to calculate the actual throughput for a WLAN site. The site is an 8011b WLAN rated at 11Mbps. Because of the use of back-off timers and ACKs, the throughput is reduced. Which setting is closest to the actual throughput of this site?
A. 5.5 Mbps
B. 6.5 Mbps
C. 7.5 Mbps
D. 8.5 Mbps
Answer: A

2. The WEP security model is good, but it can have vulnerabilities. What should be implemented with the WPA security model to help reduce these vulnerabilities?
A. Incorporate the Ipsec security protocols.
B. Use a Secure Socket Layer (SSL) encryption protocol.
C. Use a temporal key integrity protocol (TKIP) encryption scheme.
D. Make sure the firewall is between the WLAN and Corporate network.
Answer: C

3. A customer has deployed a WLAN using a 2300 solution. They notice that a wireless workstation close to an AP, is not receiving the desired signal strength. There is a wall between the AP and the wireless workstation. Which term describes what is occurring?
A. Diffraction
B. Absorbtion
C. Polarization
D. Assimilation
Answer: B

4. A customer is surveying a site for a WLAN 2300 solution deployment. Many walls exist in this environment and are causing the same signal to be received multiple times, but slightly delayed. This causes multiple spots inside the site to receive zero signal. Which two terms describe what is occurring? (Choose two.)
A. Multi-path
B. Reflection
C. Diffraction
D. Scattering
Answer: AB

5. Wireless networks need to provide access to multiple devices using a shared medium. Since wireless networks use the air as the medium, data collisions cannot be detected. What is the method that WLAN uses to prevent collisions?
A. CPDQ
B. CSMA/CA
C. CSMA/CD
D. Backoff Timer
Answer: B

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