hw 10 i need to do it

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Please find attached the description associated with Homework 10 and complete it by 11/05/17 11:59pm.

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EEGR410_Homework_10 IEEE 802.11 MEDIUM ACCES CONTROL ____________________________________________________________________________ 1. IEEE 802.11 general questions (a) Summarize and describe the basic functions in the IEEE 802.11 Physical layer (PHY) and Data Link Control layer (DLC). (b) How do IEEE 802.11 stations test for a free channel? (c) Explain the purpose of the Medium Access Control (MAC) timing parameters Short InterFrame-Space (SIFS), Point (coordination function) Interframe Space (PIFS), and Distributed (coordination function) Interframe Space (DIFS). Explain why they should be carefully chosen. Why has a station at least to wait one DIFS prior to transmission? (d) Explain the function of the Network Allocation Vector (NAV)? (e) Compare the IEEE 802.11 infrastructure and ad hoc mode according to their architecture, services, and MAC functions. (f) Discuss the suitability of using CSMA/CD (collision detection) and CSMA/CA (collision avoidance) in Wireless Local Area Networks (WLANs). Provide examples where these methods are inefficient. 2. Suppose nodes A, B and C are in an 802.11 network with access point X and assume that A and B can hear each other, A and C can hear each other, but B and C cannot hear each other. Assume RTS/CTS is not turned on. Suppose that at time 0, X is sending a packet and it continues to send for 500 µs. At time 100, A gets a packet to send and initializes its back off timer to 400 µs. At time 200, B gets a packet to send and initializes its backoff timer to 300 µs. At time 400, C gets a packet to send and initializes its backoff timer to 100 µs. Assume that it takes 200 µs to send each of the packets from A, B and C. When does each of the hosts start sending their packets. Which of them is delivered successfully, and when? You can ignore time spent on ACKs and/or *IFS. X C B A Show the timing diagram (as shown below in the IEEE 802.11 MAC Timing basic access method) indicating the events taking place corresponding to each node during the transmission between the above nodes. Assume time starts at zero during the initial transmission. AP X ________________________________________________________________time Node A ________________________________________________________________ Node B _________________________________________________________________ Node C _________________________________________________________________
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Question 1:
(a) The IEEE 802.11 Physical layer (PHY) tells the electrical and physical points
of interest for an information connection.it tells the relationship among the device and a
medium like copper and optic fiber ...etc. PHY contains the stratum of voltage and flag
term and same highlights and furthermore the recurrence for remote utensils. Generally,
the acknowledgments of this physical layer are utilized for tripping, inactivating and
sorting out the physical layer among the hosts.
On the other hand, the Data Link Control layer (DLC) offers the task and method
of passing on information among the system animals and used to offer the methodology
to code and lessen the correct blunders that create in the physical layer.Data connect
conventions shows how the types of gear decrease and recover the impacts and
furthermore offer the approach to diminish them. It is captured with the nearby
conveyance of edges among the types of gear on the comparative Local zone network
(LAN). The data link layers usefulness is accommodated with the4 connect layer and a
squat layer of an OSI Model. The information interface layer answers to solicits from a
layer called system and afterward undertakings the requests to the physical layer.
(b) IEEE 802.11 stations test for a free channel as it is accomplished to grant and
get the sloppy crude information in a physical element.RJ45 is a much broad connector
for this physical layer. It tells the transmission node as an uncompounded, half-duplex
and full duplex. it tells the system topology as a mesh, ring or transport superlatively. It is
a sheet of low-level systems administratio...


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