1. Providing Network Services
Unit . 5
Providing Network Services
Prepared By: Shamsa Alhassouni

2. Lesson Objectives: Understand what happens when using a domain name
Understand how clients and servers interact
Understand how web pages are requested
Understand what happens when using a domain name

3. How do clients and servers interact

4. All these services rely on Client and server interaction
What are the routine services you use over networks
Update social media status
Send and receive s
Online shopping
Online Booking
All these services rely on Client and server interaction

5. How client and severs interact
One of the most common way to organize LAN is Client/Server Topology in which many clients will be connected to one end source.
A server : is a high end computer running software application (web server) that provides services for the other hosts connected to the network
Services includes:
Logins and security
File and printer sharing
Security and management
Internet access
Web sites and services
Downloading of applications and music

6. Prepared By: Shamsa Alhassouni
How client and severs interact
There are different types of servers providing the different services
Types of Servers
Prepared By: Shamsa Alhassouni

7. Request A Web Page

8. Request a website : www.google.ae Clients running web browser software
Request web page
Request a website :
Server responds carrying a Function: sending the requested document back to the client
Clients running web browser software

9. Request web page
Server Farm
A web server : is usually in a part of the network with other servers called a server farm, or within a data center.
A data center can take up one room or more floors, or an entire building. Data centers very expensive to build and keep. For this reason, only large organizations use privately built data centers to house their data and provide services to users

10. Serving up Webpage

11. Prepared By: Shamsa Alhassouni
Serving up web pages
when requesting a web page
Uniform Resource Locator (URL) identifies the following:
Protocol used (HTTP)
Domain name
Location of the resource on the server.
Protocol
Domain Name
Folder Name
File Name
Prepared By: Shamsa Alhassouni

12. Prepared By: Shamsa Alhassouni
Domain Name Service
DNS : is a protocol for how computers exchange data on the internet and private networks
This is known as the TCP/IP protocol suite.
Its main job is to turn the domain name into IP address , its like a phone book.
Prepared By: Shamsa Alhassouni

13. What happens when using a domain name
3. Root Servers
Don’t Know
2. ISP Server
Cashe memory
1 DNS Cache of client
Request
Request
Request
Don’t Know
Request
4. TLD Servers
Stores domain address information
Domain Available
IP Address is
4. Authoritative Name Servers
Knows everything about domains including IP addresses
Prepared By: Shamsa Alhassouni

14. Book Activity P-190 1 2 4 3