Computer Networks Lecture 4: Application Layer and Security
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Questions and Answers

Which of the following is an example of a program that runs on the application layer?

  • Database Management System
  • Device Driver
  • Web Browser (correct)
  • Operating System

    • What protocol is commonly used for transferring files on the application layer?

  • SMTP
  • FTP (correct)
  • HTTP
  • TCP

    • In the context of computer networking, what is the main purpose of SMTP?

  • Transferring emails (correct)
  • Transferring multimedia data
  • Transferring web pages
  • Transferring files

    • What type of content can be transferred using HTTP?

    <p>Web pages</p> Signup and view all the answers

    Which application layer protocol is commonly associated with accessing web content?

    <p>HTTP</p> Signup and view all the answers

    Which of the following activities is typically performed at the application layer in computer networking?

    <p>Email transmission</p> Signup and view all the answers

    What is the main difference between the Client-Server and Peer-to-Peer models of applications?

    <p>Client-Server model uses a centralized server for data storage, while Peer-to-Peer model allows each peer to have its own data.</p> Signup and view all the answers

    In the context of application models, what does the Client-Server model primarily involve?

    <p>Centralized data management and permanent IP addresses for servers.</p> Signup and view all the answers

    What is a characteristic of the Peer-to-Peer model of applications?

    <p>Peers communicate directly with each other and have intermittent connectivity.</p> Signup and view all the answers

    Which type of network model is generally suited for small networks with fewer than 10 computers?

    <p>Peer-to-Peer model</p> Signup and view all the answers

    What kind of network model involves a process that waits to be contacted and a process that initiates communication?

    <p>Client-Server model</p> Signup and view all the answers

    Which statement accurately describes the Client-Server network model?

    <p>The server responds to the services requested by the client.</p> Signup and view all the answers

    What type of communication occurs within the same host in the Peer-to-Peer model of applications?

    <p>Inter-process communication</p> Signup and view all the answers

    In a Peer-to-Peer network, what allows new peers to bring new service capacity as well as new service demands?

    <p>Self-scalability</p> Signup and view all the answers

    What does the Client process do in the Peer-to-Peer model of applications?

    <p>It communicates directly with other peers.</p> Signup and view all the answers

    Which network type is generally considered less costly compared to the other network type?

    <p>Peer-to-Peer Network</p> Signup and view all the answers

    Study Notes

    Application Layer

    • Examples of programs that run on the application layer include email clients, web browsers, and file transfer applications.
    • File Transfer Protocol (FTP) is commonly used for transferring files on the application layer.

    SMTP

    • The main purpose of SMTP (Simple Mail Transfer Protocol) is to send and receive emails.

    HTTP

    • HTTP (Hypertext Transfer Protocol) is used to transfer web content, including HTML, images, and other multimedia files.
    • HTTP is commonly associated with accessing web content.

    Application Layer Activities

    • Typical activities performed at the application layer include sending and receiving emails, transferring files, and accessing web content.

    Client-Server and Peer-to-Peer Models

    • The main difference between the Client-Server and Peer-to-Peer models is that in the Client-Server model, a centralized server provides services to clients, while in the Peer-to-Peer model, peers act as both clients and servers.
    • In the Client-Server model, a client process initiates communication, while a server process waits to be contacted.
    • In the Peer-to-Peer model, peers can act as both clients and servers, and communicate with each other directly.
    • The Client-Server model is generally suited for large-scale networks, while the Peer-to-Peer model is more suitable for small networks with fewer than 10 computers.
    • A characteristic of the Peer-to-Peer model is that new peers can bring new service capacity as well as new service demands.
    • In a Peer-to-Peer network, peers can provide services to each other, and communication occurs within the same host.
    • The Client process in the Peer-to-Peer model acts as a client when requesting services and as a server when providing services.
    • The Peer-to-Peer model is generally considered less costly compared to the Client-Server model.

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    Description

    This quiz covers the content from Lecture 4 on Computer Networks by Dr. Dina Fawzy, referencing the book 'Computer Networking: A Top Down Approach' by Jim Kurose and Keith Ross. It includes topics such as Application Models (Client-Server and Peer-to-Peer), Process Communication, Addressing Processes, Messaging Properties, Applications Requirements, Transport Layer Protocols, and Application Layer Security.

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