Errata

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The errata list is a list of errors and their corrections that were found after the product was released. If the error was corrected in a later version or reprint the date of the correction will be displayed in the column titled "Corrected".

The following errata were submitted by our customers and approved as valid errors by the author or editor.

Color Key: Serious Technical Mistake Minor Technical Mistake Language or formatting error Typo Question



Version Location Description Submitted By Corrected
Printed Page throughout
Throughout book

802.1X is consistently referred to as "802.1x" throughout the book. When IEEE
specifications are standalone, the letter is capitalized, as in 802.1X. When a
specification is an addition that will eventually be rolled up into its parent, the
letter is lowercase. 802.11b modified clauses in 802.11, so its letter is lowercase.

 Anonymous 
Printed Page Index
entry for preauthentication

Preauthentication was not indexed. An entry HAS BEEN CREATED to refer to page 123.

 Anonymous  Dec 2003
Printed Page p134
figure 7-14. and 7-15 ATIM window;(inside figure)

ATM window

NOW READS:
ATIM window

 Anonymous  Nov 2004
Printed Page 8
Last paragraph

"The base 802.11 specification includes the 802.11 MAC and two physical layers: a
frequency-hopping spread-spectrum (FHSS) physical layer and a direct-sequence spread-
spectrum (DSSS) link layer."

NOW READS:
"The base 802.11 specification includes the 802.11 MAC and two physical layers: a
frequency-hopping spread-spectrum (FHSS) physical layer and a direct-sequence spread-
spectrum (DSSS) physical layer."

 Anonymous  Dec 2003
Printed Page 43
Under "Backoff with the DCF"

In 2nd line under this heading,
"congestion-based data"
should be
"contention-based data"

 Anonymous 
Printed Page 47
Figure 3-17

The NAV for the RTS in Figure 3-17: "RTS=3xSIFS + Data + ACK"
NOW READS: "RTS=3xSIFS + CTS + Data + ACK"

 Anonymous  Nov 2004
Printed Page 62
First paragraph after heading, "Multirate Support"

The second sentence is missing some text:

"Speed nogotiation is particularly that are available to stations."

It should say:

"Speed negotiation is particularly important in wireless LANs because of
the plethora of modulations and data rates which are available to stations."

 Anonymous 
Printed Page 76
Figure 4-33

The 2 Mbps data rate in the figure NOW READS "0010000".

 Anonymous  Nov 2004
Printed Page 77
2nd sentence under "DS Parameter Set"

"High-rate, distribution ststem networks use the same channels..."
should be:
"High-rate, distribution ststem networks use the same channels..."

 Anonymous 
Printed Page 77
Figure 4-36 was a duplicate of Figure 8-9. This HAS BEEN CORRECTED and a new Figure 4-36 inserted in the book.

Anonymous  Nov 2004
Printed Page 80
Figure 4-39

The Beacon frame does not show the Supported Rates information element, which is
required as per clause 7.2.3.1 of 802.11-1999.

 Anonymous 
Printed Page 81
Figure 4-41

Same mistake as on page 80
Probe Response frame should also include the Supported Rates Information Element.

 Anonymous 
Printed Page 81
Figure 4-41

The second information element in the Probe Response frame "Between Interval."

NOW READS:
"Beacon Interval."

 Anonymous  Nov 2004
Printed Page 90
In section WEP Data Processing, instances of "IV" in the following

HAVE BEEN CHANGED to "ICV":

" RC4 takes the 64 input bits and generates a keystream equal to the length
of the frame body plus the IV. The keystream is then XORed with the frame
body and the IV to cipher it."

NOW READS:
" RC4 takes the 64 input bits and generates a keystream equal to the length
of the frame body plus the IVC. The keystream is then XORed with the frame
body and the IVC to cipher it."

 Anonymous  Dec 2003
Printed Page 111
Section Keying

The book says that two WEP keys are used by 802.1X. That is correct, but the
description of how the keys are used is wrong. The book states that one key is used
for upstream transmissions, and one is used for downstream transmissions. The
correct implementation is that one key is used for unicast transmissions, and the
second key is used for broadcast transmissions.

 Anonymous 
Printed Page 122
Figure 7-5

In the "shared-key authentication exchange" diagram, the authentication algorithm in
the first frame is correctly listed as "1 (shared key)." But in the other 3 frames
the authentication algorithm was previously listed as "2 (shared key)."

The algorithm in all four frames NOW READS "1 (shared key)".

 Anonymous  Nov 2004
Printed Page 123
Figure 7-6

The process is called preauthentication, but the text in the figure refers to
preauthorization. The figure should be changed to preauthentication to match the
surrounding text

{128+} Entire section;
Buffering is only performed on frames with the Order bit clear. Frames sent using
the StrictlyOrdered class are not allowed to be buffered at the access point. This
minor distinction does not appear in the text.

 Anonymous 
Printed Page 154
Middle of the page

Heading reads "TKI P data transmission". Should be "TKIP data transmission"

 Anonymous 
Printed Page 191
Figure 10-26

The HR/DSSS PLCP framing diagram shows the length and CRC fields to be a mixture of 8
and 16 bits. Whereas the standard specifies them as all 16 bits.

AUTHOR: Yes, that is correct. Both the length and CRC fields should be 16 bits.
There are three changes necessary--I did get the CRC field length
right in the "short preamble" bar at the bottom of the figure, but the
length field is wrong. Both the CRC and length field are wrong in the
"long preamble" bar at the top.

 Anonymous 
Printed Page 235
at the bottom of page

Equation at the bottom of the page must be

Path loss (dB) = 32.5 + 20 log F + 20 log d

instead of

Path loss (dB) = 32.5 + 20 log F + log d

 Anonymous