802.11® Wireless Networks: The Definitive Guide phần 4 pot

Tài liệu Guide to Securing Legacy IEEE 802.11 Wireless Networks ppt

... 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 LEGACY IEEE 802.11 WIRELESS NETWORKS Name ... external networks, such as the Internet. The IEEE 802.11 infrastructure mode is outlined in Figure 2-2 by two BSSs connected to a DS. 2-4 GUIDE TO SECURING LEGACY IEEE 802.11 WIRELESS NETWORKS...

o'reilly - 802.11 wireles networks the definitive guide

... Beacon 1 802.11 Wireless Networks: The Definitive Guide ISBN: 0-5 9 6-0 018 3-5 100transmitting 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 terminates only the link-layer authentication ... steal authentication credentials. 7.3.1 Open-System Authentication Open-system authentication is the only method required by 802.11. Calling it authentication is stretching the meaning of the...

802.11 wireless networks the definitive guide second edition

... developments of the early to mid-1990s. The alphabet soup of the first edition wasgruel compared to the mulligatawny of 2005.Matthew filled the gap between the book and contemporary wireless reality ... introduces the acronyms usedthroughout the book. With 802.11, the introduction serves another important purpose. 802.11 issuperficially similar to Ethernet. Understanding the background of Ethernet ... better. There are manydifferences between an 802.11 device and an Ethernet device, but the most obvious is that 802.11 devices are mobile; they can easily move from one part of the network to another....

Báo cáo hóa học: " Correction: Handoff optimization in 802.11 wireless networks" potx

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báo cáo hóa học: " Handoff optimization in 802.11 wireless networks" pot

... Access Handoff optimization in 802.11 wireless networksIP Hsieh and Shang-Juh Kao*Abstract In 802.11 wireless networks, a complete handoff procedure for a mobile node requires access point (AP) ... accesspoint (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 handoff are simplex, integration ... access Internetresources. Since handoff is indispensable to a mobileuser changing location, it is imperative to achieve seam-less handoff so that the connection is maintained. Seam-less handoff...

o'reilly-802.11 wireless networks- the definitive guide

... 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 own line to show how the NAV relates ... called the basic service area, defined by the propagation characteristics of the wireless medium.[1] When a station is in the basic service area, it can communicate with the other members of the...

Ant The Definitive Guide phần 4 docx

... (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, String, N) The name of the ... retrieves the name of the currently executing task and the physical location (i.e., line number) of the task in the buildfile from the BuildEvent object (event). Ant: The Definitive Guide 123...

Ant The Definitive Guide phần 7 pot

... 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. Ant: The Definitive Guide ... Ant: The Definitive Guide 200 org.apache.tools .ant. taskdefs.Touch Updates the timestamp of one or more files. Attributes datetime (all, String, N) The new modification time for the...

802.11® Wireless Networks: The Definitive Guide phần 1 pot

... 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 12 . Using 802 .11 on Windows ... 10 .1. 802 .11 FH PHY Section 10 .2. 802 .11 DS PHY Section 10 .3. 802 .11 b: HR/DSSS PHY Chapter 11 . 802 .11 a: 5-GHz OFDM PHY Section 11 .1. Orthogonal Frequency Division Multiplexing...

802.11® Wireless Networks: The Definitive Guide phần 2 ppsx

... 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. 11 MAC header from the previous ... world, the Type code is either 0x0800 (20 48 decimal) for IP itself, or 0x0806 (20 54 decimal) for the Address Resolution Protocol (ARP). Both RFC 10 42 and 8 02. 1h are derivatives of 8 02. 2's...

802.11® Wireless Networks: The Definitive Guide phần 3 doc

... 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 the body of the authentication ... indicate that the first frame is in fact the first frame in the sequence. The access point then processes the authentication request and returns its response. Like the first frame, the response...

802.11® Wireless Networks: The Definitive Guide phần 4 pot

... 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 first beacon interval, there ... the beacon interval. In the figure, the fourth beacon is delayed due to a busy medium. The ATIM window remains constant, starting at the target beacon interval and extending the length of the...

802.11® Wireless Networks: The Definitive Guide phần 5 pptx

... 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 using a 6-dBi antenna gain. There is one other ... transmission over the air. 10.1.3.1 Framing and whitening The PLCP for the FH PHY adds a five-field header to the frame it receives from the MAC. The PLCP is a relay between the MAC and the physical...

802.11® Wireless Networks: The Definitive Guide phần 6 ppt

... 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 first major task for the PRISM-2 ... that might otherwise be stored in a file on the hard disk. 12.1 .6. 1 Unlocking the smart card Users with a smart card are presented with a challenge to unlock the card when the wireless card...

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