802.11® Wireless Networks: The Definitive Guide phần 4 pot

... now. A-1 GUIDE TO SECURING LEGACY IEEE 802.11 WIRELESS NETWORKS 2. Overview of IEEE 802.11 Wireless Local Area Networks Wireless local area networks (WLAN) are groups of wireless networking ... http://grouper .ieee. org/groups/802/11/QuickGuide _IEEE_ 802_WG_and_Activities.htm and http://standards .ieee. org/getieee802. 2-1 GUIDE TO SECURING LEG...

Ngày tải lên: 14/02/2014, 08:20

... Beacon 1 802.11 Wireless Networks: The Definitive Guide ISBN: 0-5 9 6-0 018 3-5 100 transmitting the frame, the mobile station processes the frame with WEP. The header identifying the frame ... dial-up network. Both the supplicant and the authenticator are referred to as Port Authentication Entities (PAEs) in the specification. The authenticator termin...

Ngày tải lên: 25/03/2014, 10:39

... developments of the early to mid-1990s. The alphabet soup of the first edition was gruel compared to the mulligatawny of 2005. Matthew filled the gap between the book and contemporary wireless reality ... introduces the acronyms used throughout the book. With 802.11, the introduction serves another important purpose. 802.11 is superficially similar to Ethernet. Unders...

Ngày tải lên: 05/05/2014, 12:46

Ngày tải lên: 21/06/2014, 01:20

... Access Handoff optimization in 802.11 wireless networks IP Hsieh and Shang-Juh Kao * Abstract In 802.11 wireless networks, a complete handoff procedure for a mobile node requires access point (AP) ... access point (AP). In order to reduce the time in processing a handoff, its operations must be integrated across layers. Even though lower-laye r protocols involved in...

Ngày tải lên: 21/06/2014, 02:20

... reserve the medium for a fixed time period. The NAV is a timer that indicates the amount of time the medium will be reserved. Stations set the NAV to the time for which they expect to use the medium, ... represented by the bars on the NAV line at the bottom of the figure. The NAV is carried in the frame headers on the RTS and CTS frames; it is depicted on its ow...

Ngày tải lên: 04/07/2014, 08:47

... (all, String, Y) Specifies the target to execute when no target is specified on the ant command line. Ant: The Definitive Guide 1 24 7 .4 Core Task Reference The remainder of this chapter ... sets the ant. file property in the newly created Project object to the same value as the calling project, which is the name of the buildfile. Attributes antfile (all...

Ngày tải lên: 13/08/2014, 21:21

... org.apache.tools .ant. taskdefs.Sleep Pause the build for a specified amount of time. Ant: The Definitive Guide 214 antlr 1.3, 1.4 org.apache.tools .ant. taskdefs.optional.ANTLR Runs the ANTLR ... find the XML files to transform. Defaults to the project's base directory. classpath (1.4, Path, N) The classpath to use when looking up the XSLT processor....

Ngày tải lên: 13/08/2014, 21:21

... Section 12 .1. Nokia C 110 /C 111 Section 12 .2. Lucent ORiNOCO Chapter 13 . Using 802 .11 on Linux Section 13 .1. A Few Words on 802 .11 Hardware Section 13 .2. PCMCIA ... Section 11 .2. OFDM as Applied by 802 .11 a Section 11 .3. OFDM PLCP Section 11 .4. OFDM PMD Section 11 .5. Characteristics of the OFDM PHY Chapter...

Ngày tải lên: 14/08/2014, 13:20

... which is the reverse of the order used in Figure 3-10. Therefore, the frame type is the third bit in the frame control field followed by the second bit (b3 b2), and the subtype is the seventh ... the figure, the "MAC headers" for 8 02. 1h and RFC 10 42 might be the 12 bytes of source and destination MAC address information on Ethernet or the long 8 02. 1...

Ngày tải lên: 14/08/2014, 13:20

... the destination MAC address and the source MAC address. On a wireless network, the MAC header would be the 24- to 30 -byte header described in Chapter 3. Ethernet Type As with any other Ethernet ... use the source address of frames as the identity of the sender; no fields within the frame are used to further identify the sender. There are two information elements in...

Ngày tải lên: 14/08/2014, 13:20

... on the access point; therefore, the Listen Interval is one of the key parameters used in estimating the resources required to support an association. The Listen Interval is a contract with the ... TIM. The lines above the station base lines indicate the ramp-up process of the receiver to listen for the TIM. Figure 7-11. Buffered frame retrieval process At the fi...

Ngày tải lên: 14/08/2014, 13:20

... lower band (5. 15- 5. 25 GHz) 40 mW (2 .5 mW/MHz) 36 40 44 48 5. 180 5. 200 5. 220 5. 240 U-NII mid-band (5. 25- 5. 35 GHz) 200 mW (12 .5 mW/MHz) 52 56 60 64 5. 260 5. 280 5. 300 5. 320 ... band (5. 7 25- 5.8 25 GHz) 800 mW (50 mW/MHz) 149 153 157 161 5. 7 45 5. 7 65 5. 7 85 5. 8 05 [a] The allowed power is the maximum output power usin...

Ngày tải lên: 14/08/2014, 13:20

... classify them any further. Brave, stout-hearted readers can order the specification from the PCMCIA and use the dump_cis tool on Linux to read the CIS of inserted cards. The CIS assists the host ... script on the wireless station to send traffic periodically to prevent the association from timing out. 13.3 .6. 6 "MAC initialization failure, result=xxx" The fi...

Ngày tải lên: 14/08/2014, 13:20