Application Layer and Transport Layer Quiz: Characteristics and Functions

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Questions and Answers

Match the following application layer protocols with their functions:

HTTP = Hypertext Transfer Protocol FTP = File Transfer Protocol SMTP = Simple Mail Transfer Protocol POP3 = Post Office Protocol

Match the following examples of programs with the application layer they belong to:

E-mail = Application Layer Web = Application Layer Network Games = Application Layer Transport Layer Protocols = Not an application layer program

Match the following messaging properties with their descriptions:

Reliability = Ensures message delivery Ordering = Messages arrive in the same order they were sent Correctness = Messages are error-free Efficiency = Messages are delivered in a timely manner

Match the following application model structures with their descriptions:

Client-Server = One side provides services, the other consumes Peer-to-Peer = All sides have equal abilities and responsibilities Network-Core Devices = Do not run user applications End Systems = (Different) devices where application layer programs run Signup and view all the answers

Match the following network models with their characteristics:

Client-Server Model = Clients and server are differentiated Peer-to-Peer (P2P) Model = Clients and server are not differentiated Signup and view all the answers

Match the following network models with their data management approach:

Client-Server Model = Data management is centralized Peer-to-Peer (P2P) Model = Each peer has its own data Signup and view all the answers

Match the following network models with their cost implications:

Client-Server Model = Costlier than Peer-to-Peer Network Peer-to-Peer (P2P) Model = Less costlier than Client-Server Network Signup and view all the answers

Match the following communication models with their process communication type:

Client-Server model = Processes in different hosts communicate by exchanging messages Peer-to-Peer model = The communication of two processes within the same host Signup and view all the answers

Match the following network models with their scalability approach:

Client-Server model = Supports scaling Peer-to-Peer model = Self scalability – new peers bring new service capacity, as well as new service demands Signup and view all the answers

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

File Transfer Protocol (FTP) (B) Signup and view all the answers

What is the function of SMTP in the application layer protocols?

Email communication (D) Signup and view all the answers

Which model of applications involves programs running on different end systems but not on network-core devices?

Client-Server model (A) Signup and view all the answers

What is the main purpose of HTTP in the application layer protocols?

Web browsing (C) Signup and view all the answers

Which of the following is a common example of a program run on the application layer for multi-user interaction?

Text messaging app (B) Signup and view all the answers

What does FTP stand for in the context of application layer protocols?

File Transfer Protocol (C) Signup and view all the answers

What is the primary difference between Client-Server model and Peer-to-Peer (P2P) model?

In Client-Server model, there is a centralized server for data storage, while in P2P model, each peer has its own data. (D) Signup and view all the answers

Which network model is generally more cost-effective for small networks with fewer than 10 computers?

Peer-to-Peer (P2P) Model (A) Signup and view all the answers

What is the main role of the server in a Client-Server network?

To store and manage the data centrally (C) Signup and view all the answers

In a Peer-to-Peer (P2P) network, what is the characteristic of the end systems/hosts?

They directly communicate with peers and manage their own data (D) Signup and view all the answers

What type of communication occurs between processes in different hosts in the Client-Server model?

Message exchange between processes in different hosts (C) Signup and view all the answers

What distinguishes a client process from a server process in the Peer-to-Peer model?

Client processes initiate communication, while server processes wait to be contacted. (C) Signup and view all the answers

Which statement accurately describes the data management approach in a Client-Server network?

The centralized server is used to store and manage the data. (D) Signup and view all the answers

What is a key characteristic of Peer-to-Peer (P2P) networks in terms of scalability?

New peers bring new service capacity and demands. (B) Signup and view all the answers

What differentiates the communication approach in Client-Server and Peer-to-Peer (P2P) networks?

In Client-Server networks, clients directly communicate with each other; In P2P networks, all communication goes through the server. (C) Signup and view all the answers

Which statement accurately describes the role of peers in a Peer-to-Peer (P2P) network?

Peers directly communicate with other peers and manage their own data; they have permanent IP addresses. (A) Signup and view all the answers

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Study Notes

Application Layer Protocols

SMTP (Simple Mail Transfer Protocol) is a protocol used for sending and receiving emails
HTTP (Hypertext Transfer Protocol) is a protocol used for transferring data over the web
FTP (File Transfer Protocol) is a protocol used for transferring files over the internet

Application Layer Programs

Examples of programs that run on the application layer include email clients, web browsers, and file transfer clients
These programs allow users to interact with the network and access network resources

Messaging Properties

Persistent messaging: messages are stored in a message queue and delivered when the recipient is available
Non-persistent messaging: messages are not stored and are lost if the recipient is unavailable
Request-response messaging: a request is sent and a response is received
Asynchronous messaging: messages are sent and received independently

Application Model Structures

Client-Server model: a centralized server provides resources and services to multiple clients
Peer-to-Peer (P2P) model: peers act as both clients and servers, sharing resources and services with each other

Network Models

Client-Server model: a centralized server manages and provides resources to clients
Peer-to-Peer (P2P) model: peers act as both clients and servers, sharing resources and services with each other
Hybrid model: a combination of Client-Server and P2P models

Network Models: Data Management Approach

Client-Server model: data is stored and managed on the server
Peer-to-Peer (P2P) model: data is distributed and managed by peers

Network Models: Cost Implications

Client-Server model: generally more expensive for large networks
Peer-to-Peer (P2P) model: generally more cost-effective for small networks
Hybrid model: cost depends on the specific implementation

Communication Models

Client-Server model: communication occurs between clients and servers
Peer-to-Peer (P2P) model: communication occurs between peers
Request-response communication: a request is sent and a response is received
Asynchronous communication: messages are sent and received independently

Network Models: Scalability Approach

Client-Server model: scalability is achieved by adding more servers
Peer-to-Peer (P2P) model: scalability is achieved by adding more peers

Key Concepts

In a Client-Server network, the server provides resources and services to clients
In a Peer-to-Peer (P2P) network, peers act as both clients and servers
The main role of the server in a Client-Server network is to provide resources and services
In a Peer-to-Peer (P2P) network, end systems/hosts are equal peers
In the Client-Server model, communication occurs between clients and servers
In the Peer-to-Peer (P2P) model, communication occurs between peers
The primary difference between Client-Server and Peer-to-Peer (P2P) models is the role of the end systems/hosts

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Computer Networks Lecture 4: Application Layer and Transport Layer

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