I hate it when exams do this , asking questions that you must go and scroll through the whole damn web , to find answers for ,as they were never mentioned in the book. No wonder people are braindumping , because this was nowhere to be found in any of my 3 wireless books that I had lying around
Here's some 802.11 a info
The 802.11a standard is quite different from its 802.11b counterpart. Among 802.11a's characteristics:
A wide variety of high data rates are available: 6, 9, 12, 18, 24, 36, 48, and 54 Mbps.6, 12, and 24 Mbps are mandatory for all products.
Operating frequencies fall into unlicensed national information structure (U-NII) bands at 5.15 to 5.25 GHz, 5.25 to 5.35 GHz, and 5.725 to 5.825 GHz. This provides plenty of bandwidth to support the higher speeds. In the US, the Code of Federal Regulations, Title 47, Section 15.407, regulates these frequencies.
Maximum output power is 40 mW for products operating at 5.15 to 5.25 GHz, 200 mW for 5.25 to 5.35 GHz, and 800 mW for 5.725 to 5.825 GHz.
The physical layer uses orthogonal frequency division multiplexing (OFDM) for modulating data before transmission. A combination of binary and quadrature phase shift keying (BPSK and QPSK) provide the different data rates.
Forward error correction (convolutional coding) compensates for an errored packet without the need for retransmission. FEC reduces overhead when noise or interference causes bit errors.
Some news for future exam takers Look here , Maybe Planet 3 will give us a fighting crack at this exam
"McGRAW-HILL/OSBORNE MEDIA TO DISTRIBUTE CWNA STUDY GUIDE
Planet3 Wireless, Inc. and McGraw-Hill/Osborne Media have
signed an agreement whereby McGraw-Hill/Osborne will distribute
The CWNA Official Study Guide into retail outlets worldwide.
The book, published by Planet3 Wireless last February, has
been updated and re-branded to reflect the McGraw-Hill/Osborne
relationship, and will be available in stores February 18,
2003. The newly updated book is available for immediate
delivery from the CWNP Online Store, and UPS ground shipping
is free within the continental U.S. To find out more visit:http://www.cwne.com/products/CWNASGPRINT.html