Archive for August, 2008

Java Certification Overview

Saturday, August 30th, 2008
Sun’s certification program in Java technology is an industry recognized, worldwide program that focuses on critical job roles in software application development and enterprise architecture. Since these certifications focus on the technology, the knowledge and skills learned while preparing for Sun’s certifications are transportable from one company to another.Sun’s philosophy is that certification is central to the learning process as it provides validation of skill sets for specific job roles. Sun certification also offers a natural progression to support your career goals.
  • First, by becoming a Sun Certified Associate Sun verifies that you have a base set of knowledge that enables entry into a career in application development or software project management using Java technology.
  • Second, we train developers on a foundational set of skills, which can then be validated by becoming a Sun Certified Programmer.
  • Afterwards, you can pursue advanced or specialty training and certifications that help enable career growth into more specific job roles making you more valuable to an organization.

Sun offers the following Java technology professional certifications:
- Sun Certified Java Associate (SCJA)
- Sun Certified Java Programmer (SCJP)
- Sun Certified Java Developer (SCJD)
- Sun Certified Web Component Developer (SCWCD)
- Sun Certified Business Component Developer (SCBCD)
- Sun Certified Developer For Java Web Services (SCDJWS)
- Sun Certified Mobile Application Developer (SCMAD)
- Sun Certified Enterprise Architect (SCEA)
Please note that the goal of Sun certification is to test on a particular job role. Thus, to prepare for a certification exam we recommend Sun training and six to twelve months of actual job role experience. Sun does not claim that by taking courses you are guaranteed to pass the certification exams, however we do state that Sun training is an important component in certification preparation. Please see training preparation methods corresponding with each certification listed above.

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Saturday, August 30th, 2008

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CWNP PW0-100 (cwna)Q&A DEMO(2)

Saturday, August 30th, 2008

11. What are some common specifications for 802.11 WLAN antennas?
A. Spectral Purity Rating
B. Frequency Range in MHz
C. Impedance in Ohms
D. VSWR Rating
E. Return Loss Rating
F. Polarization
Answer: BCDF 

12. What word describes an RF signal that bounces off a smooth or coated surface and changes direction?
A. Diffraction
B. Reflection
C. Refraction
D. Diffusion
E. Scattering
Answer: B

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13. What is the most common mount type for installing a wireless LAN antenna to an outdoor mast (pole)?
A. Suction cups with threaded posts
B. Perforated radome enclosure
C. Magnetic mount with bulkhead adapter
D. U-bolt with base clamp
E. Tilt-n-swivel universal mount with ratchet adjustment
Answer: D

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CWNP PW0-100 (cwna)Q&A DEMO(1)

Saturday, August 30th, 2008

1. What factors affect the propagation distance of an RF signal?
A. Antenna gain
B. Receiving station sensitivity
C. Fresnel zone blockage
D. Power over Ethernet (PoE) usage
E. Antenna polarization
F. Link budget calculations
Answer: AC 

2. Given: XYZ Corporation is experiencing connectivity problems with their existing building-to-building bridge link.
A brick wall on the roof of one building is partially blocking the Fresnel Zone, and the connection is dropping many
frames. The administrator moves the antenna to an area not obstructed by the brick wall and then realizes the RF cable
cannot reach the new location.
If an RF extension cable is used, what are the likely results?
A. The data throughput rate will increase because VSWR will decrease.
B. The Equivalent Isotropically Radiated Power (EIRP) will decrease.
C. The antenna coverage area will decrease.
D. The return loss will increase unless the impedance of the RF extension cable is equal to 50% of the antenna
impedance.
E. The likelihood of a direct lightning strike will increase, placing the entire WLAN system at risk.
Answer: BC

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3. While working on a presentation document in a conference room equipped with a wireless network, you notice that, as
you turn your laptop in different directions, your wireless signal strength changes. What RF signal property is primarily
responsible for this change in signal strength?
A. The RF signal’s amplitude is changing due to a change in the visual line-of-sight.
B. The RF signal’s wavelength is being affected by varying antenna gain.
C. The RF signal’s multipath is changing the amount of RF absorbed by nearby objects.
D. The RF signal’s phase is oscillating due to electromagnetic interference (EMI).
E. The RF signal’s polarization is different than the receiving antenna.
Answer: E

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