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642-577 考试是 Cisco 公司的 Wireless LAN Wireless LAN for System Engineers (WLANSE) 认证考试官方代号，TestInside 642-577 权威考试题库软件是 Cisco 认证厂商的授权产品，TestInside 绝对保证第一次参加 642-577 考试的考生即可顺利通过，否则承诺全额退款！

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Exam : Cisco 642-577
Title : Wireless LAN for System Engineers


1. A customer has a current site with an omni-directional antenna. It has 50 ft. of cabling that they are increasing to 100 ft.This change in cabling could _____.
A. increase the data rate
B. increase the coverage area
C. decrease the coverage area
D. decrease the angle of radiation from the antenna
Answer: C

2. The WLSE Cisco Aironet Conversion Tool allows the administrator to _____.
A. store base AP configuration
B. convert VxWorks APs to IOS
C. store base client configuration
D. convert APs to either VxWorks or IOS
Answer: B

3. In the U.S., no licensing is required for which four RF bands? (Choose four.)
A. 902-928 MHz
B. 800-820 MHz
C. 2.400-2.483 GHz
D. 2.500-2.600 GHz
E. 5.150-5.350 GHz
F. 5.725-5.825 GHz
Answer: ACEF

4. A community wants to give officers access to the station house's server when they are on the road to view police records, which could help avert potential deadly and threatening individuals. The design has several bridges distributed throughout the city to provide coverage in every area of the city.What antenna would be most appropriate on the police cruiser?
A. an omni-directional antenna
B. a directional antenna (Yagi)
C. a directional antenna (patch)
D. an isotropically designed antenna
Answer: A

5. What are three benefits of using EAP/802.1X authentication for WLAN networks? (Choose three.)
A. detects 802.11 radio interference
B. detects Denial of Service (DOS) attacks on the WLAN network
C. dynamically generates key material for encrypting data packets
D. provides mutual authentication between the user and the network
E. allows the IT administrator to implement user or user-group based policies (such as dynamic VLAN assignment)
Answer: CDE

6. The typical antenna for a root bridge in a multipoint deployment is a(n) _____.
A. Yagi antenna
B. Sector antenna
C. Parabolic dish antenna
D. Omni-directional antenna
Answer: D

7. What are three components of WPA (Version 1)? (Choose three.)
A. LEAP
B. 48-bit IV
C. 802.1X authentication
D. 256-bit AES encryption cipher
E. per-packet keying and Message Integrity Check
Answer: BCE

8. What is the relationship between data rate and cell size (coverage area)?
A. The highest data rate has the largest cell size.
B. The lowest data rate has the smallest cell size.
C. The highest data rate has the smallest cell size.
D. Only the transmit power and antenna gain control the cell size not the data rate.
Answer: C

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