Wi-Fi vs. 802.11

-
Wi-Fi is a subset of the 802.11 standard that is managed by the Wi-Fi Alliance. Because the 802.11 standard is so large, and the process required to update the standard can take awhile (it's run by a committee), nearly all of the major wireless equipment manufacturers decided they needed a smaller, more nimble group dedicated to maintaining interoperability among vendors. This resulted in the creation of the Wi-Fi Alliance.

The Wi-Fi Alliance assures that all products with a Wi-Fi-certified logo work together. This way if any ambiguity in the 802.11 standard crops up, the Wi-Fi Alliance defines the "right thing" to do. It also allows vendors to implement important subsets of draft standards (standards that have not yet been ratified). The most well-known example of this is Wi-Fi Protected Access (WPA) or "draft" 802.11n equipment.

Postingan populer dari blog ini

Membangun Jaringan Wireless Dengan Mikrotik

-
Gambar
Pendistribusian akses jaringan menggunakan teknologi nirkabel/wireless saat ini semakin menjadi pilihan. Cakupan area, kemudahan serta sifat flexible pada wireless menjadi alasan admin jaringan menggunakan nya. Untuk area-area yang banyak dikunjungi orang seperti mal, cafe, atau kantor dimana pengunjung akan selau berganti dengan jumlah yang tidak tentu (dinamis), teknologi wireless sangat tepat digunakan. Dalam implementasi di lapangan, sebelum perangkat Wireless Mikrotik dapat memberikan akses ke client di bawah nya, maka perangkat tersebut harus dapat menerima akses dari provider terlebih dahulu. Konfigurasi Dasar Mikrotik Langkah pertama yang harus dilakukan adalah konfigurasi dasar Mikrotik agar dapat menerima akses dari provider. Ada banyak metode yang bisa diterapkan, disesuaikan dengan metode distribusi yang diterapkan oleh provider. Langkahnya dapat mengikuti video tutorial berikut. Distribusi Wireless Ada 2 metode yang bisa digunakan dalam melakukan distribusi wireless ke ar...
More »

The 802.11 MAC

-
Gambar
O ne of the most important aspects of the 802.11 standard is the rules laid down for Media Access Control (MAC). Regardless of the physical layer 802.11 is implemented on (2.4-GHz ISM band, 5-GHz UNII band, and so on), the MAC rules stay the same. Distributed Coordination Function The 802.11 standard specifies two modes in which MAC can operate: contention free and contention based. In contention-based MAC, stations basically fight for access to the media. Similar to Ethernet, when a station wants to transmit first, it checks to see if another station is using the wire. In an Ethernet network, a station waits until the media is not in use and then transmits the packet. If another station transmits at the same time, it will detect the collision and randomly back off. This makes Ethernet a carrier sense multiple access/collision detection (CSMA/CD)–based algorithm.
More »

Introduction to (the history of Wifi)

-
Gambar
The 802.11 standard defines a link layer wireless protocol and is managed by the Institute of Electrical and Electronics Engineers (IEEE). Many people think of Wi-Fi when they hear 802.11, but they are not quite the same thing. In recent years, Wi-Fi and 802.11 have exploded in popularity, and every new laptop comes with a builtin Wi-Fi adapter. This popularity has led to a surge of research into the security of the 802.11 standard. The history about the first 802.11 standard was approved in 1997 and allowed transmission speeds that topped out at 2 Mbps. This version of the standard allowed two different methods for encoding information at a physical level, Frequency Hopping Spread Spectrum (FHSS) and Direct Sequence Spread Spectrum (DSSS). These two different encoding schemes are incompatible, however, and the choice led to a lot of confusion in the marketplace.
More »