Which of the following service is primarily used to exchange MPDUs when the MPDU must transverse the DS to get from a station in one BSS to station in another BSS?

IEEE 802.11 WIRELESS LANOVERVIEW●IEEE 802 is a committee that has developed standards for a wide range oflocal area networks (LANs).●In 1990, the IEEE 802 Committee formed a new working group, IEEE 802.11,with a charter to develop a protocol and transmission specifications forwireless LANs (WLANs).●Since that time, the demand for WLANs at different frequencies and data rateshas exploded.●Keeping pace with this demand, the IEEE 802.11 working group has issued anever-expanding list of standards. Table 6.1 briefly defines key terms used inthe IEEE 802.11 standard.

IEEE 802.11 Wireless LanOverviewThe Wi-Fi Alliance●The first 802.11 standard to gain broad industry acceptance was 802.11b.Although 802.11b products are all based on the same standard, there isalways a concern whether products from different vendors will successfullyinteroperate.●To meet this concern, the Wireless Ethernet Compatibility Alliance (WECA), anindustry consortium, was formed in 1999.

IEEE 802.11 Wireless LanOverview

IEEE 802.11 Wireless LanOverviewIEEE 802 Protocol Architecture:1) PHYSICAL LAYERThe lowest layer of the IEEE 802 reference model is the physical layer, which includessuch functions asencoding/decoding of signals and bit transmission/reception.In addition, the physical layer includes a specification of thetransmission medium.In the case of IEEE 802.11, the physical layer alsodefines frequency bands andantenna characteristics.

IEEE 802.11 Wireless LanOverviewIEEE 802 Protocol Architecture:2) MEDIA ACCESS CONTROLAll LANs consist of collections of devices that share the network’s transmission capacity.Some means of controlling access to the transmission medium is needed to provide anorderly and efficient use of that capacity.This is the function of a media access control (MAC) layer. The MAC layer receives datafrom a higher-layer protocol, typically the Logical Link Control (LLC) layer, in the form ofa block of data known as theMAC service data unit (MSDU).In general, the MAC layer performs the following functions:1) On transmission, assemble data into a frame, known as a MAC protocol data unit(MPDU) with address and error-detection fields.2) On reception, disassemble frame, and perform address recognition and errordetection.3) Govern access to the LAN transmission medium.

IEEE 802.11 Wireless LanOverview

IEEE 802.11 Wireless LanOverviewThe exact format of the MPDU differs somewhat for the various MAC protocols in use.•MAC Control:This field contains any protocol control information needed for thefunctioning of the MAC protocol. For example, a priority level could be indicated here.•Destination MAC Address:The destination physical address on the LAN for this MPDU.•Source MAC Address:The source physical address on the LAN for this MPDU.

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