25 Questions
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
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
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
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
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
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
Which of the following is an example of a program run on the application layer?
File Transfer Protocol (FTP)
What is the function of SMTP in the application layer protocols?
Email communication
Which model of applications involves programs running on different end systems but not on network-core devices?
Client-Server model
What is the main purpose of HTTP in the application layer protocols?
Web browsing
Which of the following is a common example of a program run on the application layer for multi-user interaction?
Text messaging app
What does FTP stand for in the context of application layer protocols?
File Transfer Protocol
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.
Which network model is generally more cost-effective for small networks with fewer than 10 computers?
Peer-to-Peer (P2P) Model
What is the main role of the server in a Client-Server network?
To store and manage the data centrally
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
What type of communication occurs between processes in different hosts in the Client-Server model?
Message exchange between processes in different hosts
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.
Which statement accurately describes the data management approach in a Client-Server network?
The centralized server is used to store and manage the data.
What is a key characteristic of Peer-to-Peer (P2P) networks in terms of scalability?
New peers bring new service capacity and demands.
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.
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.
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
This quiz covers topics from Lecture 4 of the Computer Networks course, focusing on the Application Layer and Transport Layer. It includes discussions on application models, process communication, addressing processes, messaging properties, application requirements, transport layer protocols, and application layer security.
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