Errata

"Frames from the distribution system have the ToDS bit set, ..."
might be changed to
Frames to the distribution system have the ToDS bit set, ..."

Note from the Author or Editor:
Change the word "from" to "to" as suggested by the comment.

Note that the existing unconfirmed errata for page 95 should be removed if this one is accepted. Changing the bits in the figure means that the exisiting text can be kept as printed.

The bits in the section labeled "2Mps, mandatory" are:
0 1 0 0 0 0 0
should be:
0 0 1 0 0 0 0

Note from the Author or Editor:
This figure needs to have its bit significance corrected. The figure is supposed to depict least significant bits first (which is the transmission order), but many of the figures in this book have been shown in network bit order.

"2-Mbps" should be changed to "1-Mbps" because the first example of Supported
rate is "0000010" in hex, corresponding rate of this binary value is "2 Mbps"
as in Table 4-8.

Note from the Author or Editor:
This is the best suggested fix to the figure.

"The 16 low-order bytes are used to generate a WEP IV. The middle byte of the
WEP IV is constructed so that it avoids generating weak RC4 keys."

should be:

"The 16 low-order bits are used to generate the low and high bytes of a WEP IV.
The middle byte of the WEP IV is a dummy byte of fixed value, chosen to avoid
generating weak RC4 keys."

The author is talking about CCMP, so in the first item I think it should be:

1. The 802.11 frame is queued for transmission. It consists of a frame header and
the payload. Like TKIP, CCMP protects only the payload ofthe 802.11 MAC, and
leaves the 802.11 frame header, as well as any lower-layer headers, intact.

Instead of:

1. The 802.11 frame is queued for transmission. It consists of a frame header and
the payload. Like WEP, TKIP protects only the payload ofthe 802.11 MAC, and
leaves the 802.11 frame header, as well as any lower-layer headers, intact.

Note from the Author or Editor:
Suggested fix to item 1:
"The 802.11 frame is queued for transmission. It consists of a frame header and the payload. Unlike WEP and TKIP, CCMP protects both the payload and header of and the 802.11 MAC."

The discussion of shared-key authentication incorrectly identifies several components of the frames as information elements. However, the Authentication Algorithm Number (8.4.1.1), the Authentication Transaction Sequence Number (8.4.1.2), Status Code (8.4.1.9) are all fixed fields, not information elements. The Challenge Text (8.4.2.9) is an information element.

Each of the numerical identifiers in this erratum identifies the location and description of the components of the frame in the 802.11-2012 revision.

In Figure 8-14, the second frame transmitted by the AP in the fifth Beacon interval is labeled "MC" for multicast. That frame should be a unicast frame.

Figure 8-18:
Switch location of "Frame to 2,3, and 4" and "Frame to 1"

line 1:
change to : remain active until the conclusion of the next ATIM window...

Note from the Author or Editor:
Both of the reader's suggestions are correct. Make the suggested changes to the figure and text.

Action Value should be 1

Note from the Author or Editor:
The commenter is correct.

The channel switch announcement (CSA) frame is shown to include a dialog token when in fact this is not the case. A dialog token is used for the other Spectrum Management action frames, but according to section 7.4.1.5 of the IEEE STD 802.11 - 2007, CSA frames do not use dialog tokens.

Note from the Author or Editor:
The commenter is correct. Remove the Dialog Token field.

picture of receiver has 1st block label PLCP. other authors put GFSK demodulator
there.

Note from the Author or Editor:
The commenter is correct.

"Five fields comprise the header: ..."

There only four fields in the header.

on the picture is txt : short: 48 bits @ 1 Mbps DBPSK
i think it should be : short: 48 bits @ 2 Mbps DQPSK

Note from the Author or Editor:
The comment is correct.