Analyze the significance of devices at the Application Layer, including proxies and gateways, in facilitating communication between different application protocols.
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Analyze the significance of devices at the Application Layer, including proxies and gateways, in facilitating communication between different application protocols.
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- Describe the functions and devices associated with the Application Layer in the OSI model, including common application-layer protocols.Design and describe an application level protocol to be used between an automatic teller machine(ATM) and a bank's centralized computer.(a)Your protocol should allow a user's card and password to be verified,the account balance (maintained at the centralized computer) to be queried and an account withdrawal to be made.Your protocol entities should be able to handle the all-too-common case in which there is INSUFFICIENT BALANCE on the account to cover the withdrawal.Specify your protocol by listing the messages exchanged and the action taken by the ATM or the bank's centralized computer on transmission and receipt of messages.(b)Sketch the operation of your protocol for the case of a simple withdrawal with no errors.(c) Explicitly state the assumptions made by your protocol about the underlying end-to-end transport service.What is the distinction between the network architecture and the application architecture?
- In the OSI model, three layers divide the application layer from the network layer: presentation, session, and transport. The application layer is closest to the end user and the network layer is closest to the physical network. Based on the functions of the three layers between application and network, how do you anticipate the implementation of these layers changes from application to network, as information is moved from one layer to another? What is the importance of understanding the functions of these layers? How are layers represented in the TCP/IP model?In the OSI model, analyze the functions and protocols involved in end-to-end communication for a web-based application, from the user's browser to the web server.Describe client/server architecture including its components