IEEE 802.11: IEEE 802.11 stands for wireless LAN that was ratified by the Institute of Electrical and Electronics Engineering. There are many 802.11 standards for wireless LAN technology in the IEEE 802.11. The different 802.11 standards all share some common characteristics. Basic service set (BSS) is a fundamental building block of 802.11 architecture. The BSS also known as Access Point (AP). Every wireless station in 802.11 wants to associate with an access point before it can send or receive network layer data. DIFS: DIFS stands for DCF Interframe Spacing. It is a time delay for which sender wait after finishing its back off, previously sending RTS package. SIFS: SIFS stands for Shortest Interframe Spacing and it is consider as shortest among above mention networking technology. Request to send (RTS)/ clear to send (CTS): The optimal mechanism used by the IEEE 802.11 is RTS. This is used to decreasing the frame collisions which was introduced by the hidden node problem. In order to avoid the collisions problem, the IEEE 802.11 protocol allows a station to use Request to Send (RTS) and Clear to Send (CTS) control frames to reserve access to the channel. When a sender want to send a data frame, it can initial send an RTS frame to the AP. After AP receives the RTS frame, it will responds by broadcasting a CTS frame.

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Here is the text extracted from the uploaded image: Question 6: A major Saudi book retailer is planning to develop a computer system to handle the store’s new online bookshop: BookShop.com. You have been chosen to do the analysis and design. As part of the development of the system, perform the following tasks: 1.Write Expanded Use Cases for buying a book from the shop using a credit card. 2.Draw an Expanded Use Case for the following interactions: •Buying a book from the shop using a credit card. •Checking the status of one’s orders (being filled, shipped, etc.) •Pay for Product •Validate customer identity Use Case: Buy Book Actors: Customer Purpose: To buy a book from BookShop.com using a credit card. Overview: A customer has selected a book to buy at the Murray.com website. The system prompts for the customer’s username and password. The customer enters these details. The system verifies the customer’s identity and retrieves the customer’s name and address, then prompts for…

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Chapter 7, Problem P7P

Program Plan Intro

IEEE 802.11:

IEEE 802.11 stands for wireless LAN that was ratified by the Institute of Electrical and Electronics Engineering.

There are many 802.11 standards for wireless LAN technology in the IEEE 802.11. The different 802.11 standards all share some common characteristics.

Basic service set (BSS) is a fundamental building block of 802.11 architecture. The BSS also known as Access Point (AP).

Every wireless station in 802.11 wants to associate with an access point before it can send or receive network layer data.

DIFS:

DIFS stands for DCF Interframe Spacing. It is a time delay for which sender wait after finishing its back off, previously sending RTS package.

SIFS:

SIFS stands for Shortest Interframe Spacing and it is consider as shortest among above mention networking technology.

Request to send (RTS)/ clear to send (CTS):

The optimal mechanism used by the IEEE 802.11 is RTS. This is used to decreasing the frame collisions which was introduced by the hidden node problem.

In order to avoid the collisions problem, the IEEE 802.11 protocol allows a station to use Request to Send (RTS) and Clear to Send (CTS) control frames to reserve access to the channel.

When a sender want to send a data frame, it can initial send an RTS frame to the AP. After AP receives the RTS frame, it will responds by broadcasting a CTS frame.

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