The document discusses client-server protocols. It defines a client-server network as consisting of a central server computer directing multiple client computers. Common client-server protocols include HTTP, FTP, SMTP, POP, and IMAP. HTTP is used for web browsing and transferring data over the web using a request-response model. FTP transfers files between computers using separate control and data connections. SMTP sends email between servers using a store-and-forward model. POP and IMAP retrieve email from servers, with IMAP allowing access from multiple devices by keeping messages on the server. The document outlines advantages like scalability and security but also disadvantages such as single points of failure and network dependency.

1. 1
Sanjivani College of Engineering, Kopargaon
(An Autonomous Institute)
Affiliated to Savitribai Phule Pune University, Accredited ‘A’ Grade by NAAC
Department of Electronics and Telecommunication Engineering
PRESENTATION
ON
Standard client server protocol
Guided by :
Prof. N. K.Darwante
Group Members:
Name- PRN No-
1. Avhad Unnati Santosh UET19F1002
2. Bhadakwade Sakshi Sanjay UET19F1004
3. Ghangare Rajashri Sunil UET19F1022
4. Nagare Darshana Vilas UET19F1041

2. WHAT IS CLIENT SERVER NETWORK
• A client-server network is a form of internet network that consists of a
single central computer functioning as a server and directing several other
computers, referred to as clients.
• Clients can access shared files and information kept on the serving
machine by connecting to the server.
• The client-server model describes how a server gives one or more clients
access to resources and services.
• Mail servers, web servers, and file servers are examples of servers.
• Client devices, including desktops, laptops, tablets, and mobile devices,
have access to the resources on each of these servers.
• Clients and servers often have a one-to-many connection, which means
that a single server can supply resources to several clients at the same
time.

3. CLIENT/SERVER PROTOCOL
• A client-server protocol is a set of rules and conventions that define how a client and server communicate with each
other over a network.
• These protocols are essential for ensuring that data can be transmitted between clients and servers in a reliable and
secure manner.
Here are some common client-server protocols:
HTTP (Hypertext Transfer Protocol)
FTP (File Transfer Protocol)
SMTP (Simple Mail Transfer Protocol)
POP (Post Office Protocol)
IMAP (Internet Message Access Protocol)

4. HTTP (HYPERTEXT TRANSFER PROTOCOL)
• HTTP is a protocol used for transferring data over the web.
• It is based on a request-response model, where the client sends a
request to the server and the server responds with the requested
data.
• The most common use of HTTP is for web browsing, where a user's
browser sends HTTP requests to web servers to retrieve web pages.
• HTTP is a stateless protocol, meaning that each request is
independent of any previous request.
• This means that the server doesn't maintain any information about
the client between requests, and each request must contain all the
necessary information to be processed.

5. FTP (FILE TRANSFER PROTOCOL)
• FTP is a protocol used for transferring files between computers over the
internet.
• It is commonly used by web developers to upload and download files
from web servers.
• FTP is a client-server protocol, where the client establishes a connection
to the server and sends commands to request file transfers.
• FTP uses two separate connections: a control connection and a data
connection.
• The control connection is used for sending commands and receiving
responses, while the data connection is used for actually transferring the
files.

6. SMTP (SIMPLE MAIL TRANSFER
PROTOCOL)
• SMTP is a protocol used for sending email messages between servers.
• SMTP is a text-based protocol, meaning that each command and response
is sent as a text string.
• SMTP uses a store-and-forward model, meaning that messages are sent
from one server to another until they reach their final destination.
• SMTP messages are comprised of two parts:
1) envelope
2) message body
• The envelope contains information about the sender and recipient, as well
as any other delivery instructions.
• The message body contains the actual content of the email message.

7. POP (POST OFFICE PROTOCOL)
• POP is a protocol used to retrieve email messages from an email server.
When you check your email, your email client uses POP to download new
messages from the server.
• POP is a simple protocol, where the client sends a series of commands to
the server to retrieve the messages.
• POP supports two modes of operation: download-and-delete and
download-and-keep.
• In download-and-delete mode, the messages are deleted from the server as
soon as they are downloaded to the client.
• In download-and-keep mode, the messages are left on the server, allowing
the user to access them from multiple devices.

8. IMAP (INTERNET MESSAGE ACCESS
PROTOCOL)
• IMAP is another protocol used for retrieving email
messages. Unlike POP, IMAP allows you to keep your
messages on the server and access them from multiple
devices
• IMAP is a more advanced protocol than POP, and
supports features such as folder management, message
flags, and search capabilities.
• IMAP messages are stored on the server, and the client
uses a series of commands to access and manipulate
them. IMAP allows

9. ADVANTAGES AND DISADVANTAGES OF
CLIENT-SERVER PROTOCOL
1. Advantages :
• Scalability: Client-server protocols are scalable, meaning that they can handle a large number of clients
simultaneously without overburdening the server. This is because the server can distribute the workload
across multiple clients.
• Security: Client-server protocols can provide better security than other types of protocols because they
can authenticate and authorize users, encrypt data, and control access to resources.
• Reliability: Client-server protocols can ensure reliable data transmission by using error correction and
retry mechanisms. They can also handle network congestion and manage resources effectively.
• Centralized management: Client-server protocols allow for centralized management of data and
resources, making it easier to maintain and update systems.

10. 2. Disadvantages :
• Single point of failure: Client-server protocols have a single point of failure, meaning that if the
server goes down, the entire system becomes unavailable.
• Dependency: Client-server protocols are dependent on network connectivity and the availability of
the server. If there is a network issue or the server is unavailable, the system may not function
properly.
• Cost: Implementing client-server protocols can be costly due to the need for specialized hardware
and software.
• Complexity: Client-server protocols can be complex to implement and maintain, especially for
large systems.

11. CONCLUSION
In conclusion, client-server protocols are an essential part of modern computing, allowing for
efficient and reliable communication between client devices and servers. These protocols provide
several advantages, including scalability, security, reliability, and centralized management, but also have
some drawbacks, such as a single point of failure, dependency on network connectivity and server
availability, cost, and complexity. When selecting a client-server protocol for an application, it is
essential to consider these advantages and disadvantages and choose the protocol that best suits the
needs of the organization. Overall, client-server protocols have played a crucial role in the development
and success of modern computing, and their importance is likely to continue growing in the future.

12. REFERENCES
1. https://www.techtarget.com/searchnetworking/definition/client-
server#:~:text=denial%20of%20service.-
,Client%2Dserver%20protocols,end%20have%20finished%20exchanging%20messages.
2. https://www.geeksforgeeks.org/client-server-model/
3. https://en.wikipedia.org/wiki/Client%E2%80%93server_model
4. Behrouz A. Forouzan, “Data Communications and Networking”,MacGraw Hill, 5th
edition,Chapter 26.

13. Thank You!