CCNP Wireless FAQ: Evaluating and Selecting Wireless Equipment
Q1. Why is it important to visit an actual deployment site before you purchase wireless equipment?
Answer: It is important to visit actual deployment sites to learn about unpublished equipment interactions and unknown operational characteristics.
Q2. The electromagnetic waves that we call wireless exist at what layer of the sevenlayer OSI reference model?
Answer: Electromagnetic waves exist at Layer 1, the physical layer.
Q3. How is a packet like a hamburger sandwich?
Answer: A packet is like a hamburger sandwich because the meat (the data payload) is sandwiched in the bun (packet management and control information).
Q4. Why does a wireless network need a big MAC?
Answer: A wireless network needs a bigMAClayer because theMACmust deal successfully with management of all the invisible and unpredictable wireless-related issues.
Q5. Wireless bandwidth and wireless throughput are the same thing. True or false?
Answer: False. Wireless bandwidth and wireless throughput are not the same. Wireless throughput is always less than the specified wireless bandwidth.
Q6. The communications range under NLOS conditions is about the same as the communications range under LOS conditions. True or false?
Answer: False. The communications range underNLOSconditions is always less than the communications range underLOSconditions.
Q7. DSSS equipment hops from frequency to frequency. True or false?
Answer: False.DSSSequipment does not change frequency.FHSS equipment changes frequency.
Q8. Other things being equal, the higher the data rate, the shorter the communications distance. True or false?
Answer: True
Q9. If you start receiving interference from another network, the best thing to do is to get an amplifier. True or false?
Answer: False. When interference is high, an amplifier usually makes conditions worse. The best response is either to coordinate frequencies or to redesign your antenna system to minimize the effects of the interference.
Q10. Any 802.11b equipment works with any other 802.11b equipment. True or false?
Answer: False. Most 802.11b equipment works together; however, you can experience a number of incompatibilities if you fail to test thoroughly.
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