802 11® Wireless Networks: The Definitive Guide phần 2 ppsx

... 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....

Ngày tải lên: 14/08/2014, 13:20

... for 8 02 networks are specified in 8 02. 1. Among 8 02. 1's many provisions are bridging (8 02. 1d) and virtual LANs, or VLANs (8 02. 1q). 8 02. 11 is just another link layer that can use the 8 02. 2/ LLC ... common 8 02. 11 equipment as this book was written. 8 02. 11g up to 54 Mbps 2. 4 GHz Not yet standardized. 8 02. 11® Wireless Net...

Ngày tải lên: 14/08/2014, 13:20

... Response frames is reported to the 8 02. 1x state engine as the link layer becoming active. 8 02. 11 association must complete before the 8 02. 1x negotiation begins because the 8 02. 1x state machine requires ... displayed to enter the credentials that will be passed to the authentication server. 6.3 8 02. 1x on Wireless LANs 8 02. 1x provides a framework for us...

Ngày tải lên: 14/08/2014, 13:20

... 8 02. 11 FH details 8 02. 11 divides the microwave ISM band into a series of 1-MHz channels. Approximately 99% of the radio energy is confined to the channel. The modulation method used by 8 02. 11 ... preauthentication Preauthentication is not used in the most literal interpretation of 8 02. 11, shown in Figure 7-6a. As the mobile station moves to the right, the...

Ngày tải lên: 14/08/2014, 13:20

... 11 (2. 4 12- 2.4 62 GHz) Europe, excluding France and Spain (ETSI) 1 to 13 (2. 4 12- 2.4 72 GHz) France 10 to 13 (2. 457 -2. 4 72 GHz) Spain 10 to 11 (2. 457 -2. 4 62 GHz) Japan (MKK) 14 (2. 484 GHz) 10 .2. 1.4 ... band (5.15-5 .25 GHz) 40 mW (2. 5 mW/MHz) 36 40 44 48 5.180 5 .20 0 5 .22 0 5 .24 0 U-NII mid-band (5 .25 -5.35 GHz) 20 0 mW ( 12. 5 mW/MHz) 52 56 60...

Ngày tải lên: 14/08/2014, 13:20

... BOOTPROTO=static IPADDR=1 92. 168 .20 0. 125 NETMASK =25 5 .25 5 .25 5.0 NETWORK=1 92. 168 .20 0.0 BROADCAST=1 92. 168 .20 0 .25 5 ONBOOT=no Bringing up the interface is a matter of running ifup with the interface name ... Figure 12- 22. Figure 12- 22. Administrator functions of the C11x driver When the smart-card initialization completes, the user enters the PIN for t...

Ngày tải lên: 14/08/2014, 13:20

... phones operate in the ISM bands as well. 8 02. 11b and 8 02. 11g devices operate within the 2. 4 GHz ISM band, while 8 02. 11a devices operate in the 5 GHz band. The more common 8 02. 11b/g devices operate ... or security. Chapter 6, User Authentication with 8 02. 1X, describes the 8 02. 1X authentication framework. In conjunction with the Extensible Authentication Pr...

Ngày tải lên: 05/05/2014, 12:46

... frequency bands as the other 8 02. 11 physical layers. 8 02. 11a products started to appear in late 20 01; 8 02. 11g products will probably appear in late 20 02. It's a good bet that one of these standards ... node 2 unable to make sense of anything. Furthermore, nodes 1 and 3 would not have any indication of the error because the collision was local to node 2. 8 02....

Ngày tải lên: 04/07/2014, 08:47

... Beacon 1 8 02. 11® Wireless Networks: The Definitive Guide – ISBN: 0-596-00183-5 100 transmitting the frame, the mobile station processes the frame with WEP. The header identifying the frame ... 18. The Future, at Least for 8 02. 11 …………………… page 307 Current Standards Work The Longer Term The End A. 8 02. 11 MIB …………………… page 3 12 B. 8 02. 1...

Ngày tải lên: 25/03/2014, 10:39

... can use them in your buildfiles. Ant: The Definitive Guide 52 3.4.3.4 The module target The module target is almost identical to the bot target. The javac and jar tasks use nearly the same ... Ant: The Definitive Guide 50 • The source directory • The classpath • The destination directory We specify the source directory (the place in which the Jav...

Ngày tải lên: 13/08/2014, 21:21