Computer Networks Lecture 4: Application Layer and Security

Questions and Answers

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

Web Browser

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

FTP

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

Transferring emails

What type of content can be transferred using HTTP?

Web pages Signup and view all the answers

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

HTTP Signup and view all the answers

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

Email transmission Signup and view all the answers

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

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

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

Centralized data management and permanent IP addresses for servers. Signup and view all the answers

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

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

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

Peer-to-Peer model 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?

Client-Server model Signup and view all the answers

Which statement accurately describes the Client-Server network model?

The server responds to the services requested by the client. Signup and view all the answers

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

Inter-process communication 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?

Self-scalability Signup and view all the answers

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

It communicates directly with other peers. Signup and view all the answers

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

Peer-to-Peer Network 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.