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Cisco 642-577 Exam -

Free 642-577 Sample Questions:

1.EIRP is a measurement typically calculated in ______.
A: dBl
B: dBr
C: dBd
D: dBm
Answer: D

2.Which antenna provides the most flexibility at the central location of a point-to-multipoint bridging application?
A: isotropic antenna
B: 12 dBi omni-directional
C: 23 dBi grid dish antenna
D: 21 dBi parabolic dish antenna
Answer: B

3.When doing a survey in a hospital application, which three should you consider? (Choose three.)
A: pagers
B: fire doors
C: televisions
D: microwave ovens
E: radiology/x-ray areas
Answer: B, D, E

4.What is the maximum Ethernet run from the Cisco Aironet 1400 Series Bridge to the switch or router?
A: 10 km (maximum distance for single mode fiber)
B: 100 meters (maximum distance for Fast Ethernet)
C: 500 meters (Cisco Aironet 1400 Series uses a hybrid Ethernet/fiber interface.)
D: 200 meters (100 meters from Switch to Power Injector, then another 100 meters to Bridge Outdoor Unit (ODU)
Answer: D

5.What does the 802.11g protection mechanism do?
A: uses the CTS (clear to send) to manage the transmit power of all clients
B: reduces the data rate for 802.11g clients when 802.11b clients are in the same cell
C: reduces the transmit power of 802.11b clients when 802.11g clients are in the same cell
D: uses CTS (clear to send) to protect 802.11g clients from collisions with 802.11b clients
Answer: D

6.Why are diversity antennas used indoors?
A: They are smaller in size.
B: They are designed to handle multi-path.
C: They have lower transmit signal strength than standard antennas.
D: They have higher transmit signal strength than standard antennas.
Answer: B

7.Which specific antenna architecture is used to help eliminate RF null areas of coverage?
A: splitters
B: diversity
C: high gain omni
D: patch antennas
Answer: B

8.What is the purpose of the WPA 4-way handshake?
A: authenticates users
B: negotiates broadcast keys
C: derives WPA unicast keys
D: negotiates the encryption cipher types
Answer: C

9.Which statement is true about the Cisco Aironet 1400 Series Bridge?
A: It does not support wireless clients.
B: It supports wireless clients only on a root bridge per IEEE specification.
C: It supports wireless clients only on a non-root bridges with valid links to a root bridge.
D: It supports wireless clients on a root bridge when a wireless client MAC address is set to forward.
Answer: A

10.Which statement about non-overlapping channels is true?
A: Non-overlapping channels share the same frequencies to improve roaming.
B: Non-overlapping channels use different frequency bands to improve roaming.
C: Non-overlapping channels share the same frequencies but use different modulations to avoid interference.
D: Non-overlapping channels use the same frequency band but use non-shared frequencies to avoid interference.
Answer: D

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