Wireless Network Security
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1 Wireless Network Security Wireless network overview Slide from 2 nd book 1 IT352 Network Security Najwa AlGhamdi
2 IEEE IEEE 802 committee for LAN standards IEEE formed in 1990 s charter to develop a protocol & transmission specifications for wireless LANs (WLANs) since then demand for WLANs, at different frequencies and data rates, has exploded hence seen ever-expanding list of standards issued
3 IEEE 802 Terminology Access point (AP) Basic service set (BSS) Coordination function Distribution system (DS) Extended service set (ESS) MAC protocol data unit (MPDU) MAC service data unit (MSDU) Station Any entity that has station functionality and provides access to the distribution system via the wireless medium for associated stations A set of stations controlled by a single coordination function The logical function that determines when a station operating within a BSS is permitted to transmit and may be able to receive PDUs A system used to interconnect a set of BSSs and integrated LANs to create an ESS A set of one or more interconnected BSSs and integrated LANs that appear as a single BSS to the LLC layer at any station associated with one of these BSSs The unit of data exchanged between two peer MAC entites using the services of the physical layer Information that is delivered as a unit between MAC users Any device that contains an IEEE conformant MAC and physical layer
4 IEEE 802 Protocol Architecture physical layer, which includes as 1. encoding/decoding of signals and bit 2. transmission/reception. 3. includes a specification of the transmission medium. In the case of IEEE , the physical layer also defines frequency bands and antenna characteristics. 4 IT352 Network Security Najwa AlGhamdi
5 IEEE 802 Protocol Architecture media access control (MAC) layer, which controls access to the transmission medium to provide an orderly and efficient use of that capacity. The MAC layer receives data from a higherlayer protocol (LLC) layer, in the form of a block of data known as the MAC service data unit (MSDU). In the LAN protocol architecture 1. The MAC layer is responsible for detecting errors and discarding any frames that contain errors. 2. The LLC layer optionally keeps track of which frames have been successfully received and retransmits unsuccessful frames. In wireless networks such as IEEE802.11, flow control and error management is part of the MAC protocol, and not part of the LLC layer. 5 IT352 Network Security Najwa AlGhamdi
6 Network Components & Architecture The smallest building block of a wireless LAN is a basic service set (BSS), which consists of wireless stations executing the same MAC protocol and competing for access to the same shared wireless medium. A BSS may be isolated or it may connect to a backbone distribution system (DS) through an access point (AP). The AP functions as a bridge and a relay point.
7 Network Components & Architecture In a BSS, client stations do not communicate directly with one another. Rather the MAC frame is first sent from the originating station to the AP, and then from the AP to the destination station. Similarly, a MAC frame from a station in the BSS to a remote station is sent from the local station to the AP and then relayed by the AP over the DS on its way to the destination station. The DS can be a switch, a wired network, or a wireless network.
8 Network Components & Architecture each station belongs to a single BSS; that is, each station is within wireless range only of other stations within the same BSS. It is also possible for two BSSs to overlap geographically, so that a single station could participate in more than one BSS. Further, the association between a station and a BSS is dynamic. Stations may turn off, come within range, and go out of range. An extended service set (ESS) consists of two or more basic service sets interconnected by a 8 IT352 Network Security Najwa AlGhamdi distribution system.
9 IEEE Services
10 IEEE Services 1. The service provider can be either the station or the DS. Station services are implemented in every station, including AP stations. Distribution services are provided between BSSs 1. MSDU delivery 2. Distribution is the primary service used by stations to exchange MPDUs when the MPDUs must traverse the DS to get from a station in one BSS to a station in another BSS. 3. Integration enables transfer of data between a station on an IEEE LAN and a station on an integrated (wired) IEEE 802.x LAN. To deliver a message within a DS, the distribution service needs to know where the destination station is located. 4. Association establishes an initial association between a station and an AP. 5. Reassociation enables an established association to be transferred from one AP to another, allowing a mobile station to move from one BSS to another. 6. Disassociation is a notification from either a station or an AP that an existing association is terminated. 10 IT352 Network Security Najwa AlGhamdi
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