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Exam
: Nortel 920-238
Title
: Nortel WLAN 2300 Rls. 4.1
Implementation &
Management
Version : Demo
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1. 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
2. A customer wants to calculate the actual throughput for a WLAN site. The site is an 802.11b 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
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. 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
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uses to prevent collisions?
A. CPDQ
B. CSMA/CA
C. CSMA/CD
D. Backoff Timer
Answer: B
5. 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