(i) Give two advantages and two disadvantages of star topology 

(i)  Advantages 

• Ease of service 
• Centralized control 
• Easy to diagnose faults 
• One device per connection

Disadvantages 

• long cable length 
• difficult to expand 
• central node dependency

OR

www: a set of protocols that allow you to access any document on the internet through the naming systems based on URLs 

Web hosting: Web hosting is a service that allows organizations and individuals to post a website or web page onto the server, which can be viewed by everyone on the Internet.

(ii) Packet switching: 

• uses store and forward concept to send messages 
• no physical path is actually establishes 
• message is divided into smaller parts, known as packets and then sent forward 
•  tight upper limit on block size 
• Each data unit knows only the final receiver’s address

Circuit switching :

•  physical connection is established between sender and receiver 
•  Each data unit knows the entire path from sender to receiver 
•  It does not follow store and forward concept