Chapter 06 - MAC Standards Assignment - Sara Foss

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Florida SouthWestern State College, Collier *

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CNT1512

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Computer Science

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Feb 20, 2024

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CNT1512 2/24/2023 Chapter 06 - MAC Standards Assignment 1. Describe what a WLAN service set is and list the three service sets available for WLANs. A service set refers to all the devices associated with a 802.11 WLAN and how those devices communicate with each other. Three services sets that are available for WLANs are: Basic Service Set (BSS), Extended Service Set (ESS), and Independent Basic Service Set (IBSS). Most wireless networks use a BSS. 2. What is a Service Data Unit? A Service Data Unit, or SDU, refers to a data unit that has been passed from a higher OSI layer/sublayer down to a lower layer. This data unit has yet to be encapsulated into a protocol data unit by the lower layer. 3. What is a Protocol Data Unit? A Protocol Data Unit, or PDU, refers to a data unit that has been transmitted to the peer protocol layer at the receiving device on the network. A SDU changes to a PDU through the encapsulation process. 4. Why is it important that there is interoperability between 802.11 and 802.3 frame types? IEEE 802.11 and IEEE 802.3 frame types interoperate at OSI layer 2 (the data link layer). It is important that these two frame types can interoperate because data is transmitted across both and would not be able to do so if the frame type could not change to the required medium. 5. What are the four HT Operation modes used by 892.11? What are they used for? The four HT Operation modes used by 892.11 are:  Mode 0 (HT Greenfield Mode): with the assumption that there are no other stations using the same channel, this mode does not attempt to detect/support legacy devices. By skipping this, the network can operate at slightly higher speeds. Should not be used when there are multiple/legacy devices on the network.  Mode 1 (HT Nonmember Protection Mode): protection is activated when a non-HT station or AP that is not a member of the service set is detected to be transmitting on the same channel.  Mode 2 (HT 20 MHz Protection Mode): used with HT stations that use the 20/40 MHz AP, this mode uses protection to ensure that 20/40 MHz-capable stations do not transmit at the same time and interfere with each other.  Mode 3 (HT Mixed Mode): used when there are mixed device types on the network, including legacy devices; allows all devices to function properly at once.

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