1) The document discusses the star topology for computer networks, where each device connects to a central hub. Communication between devices must go through the hub. 2) Advantages of the star topology include lower costs since each device only needs one connection to the hub, easier installation since each device connects to the hub, and robustness since failure of one link does not disrupt other links. 3) A disadvantage is that if the central hub fails, all connections are lost since the hub is a single point of failure.

1. Course Tittle: Computer Networks Theory
Course Code: CSE317
Topics: Star Topology
Submitted to:
Pranab Bandhu Nath
Senior Lecturer,Dept of CSE
City University, Dhaka.
Submitted By:
Name: Neheruma Sultana Riya
ID:1834902578
Dept: CSE(Day)
Batch:49th

2. Star Topology:
In star topology each device in the network is connected to a central device called
hub. Star topology doesn’t allow direct communication between devices, a device
must have to communicate through hub. If one device wants to send data to other
device, it has to first send the data to hub and then the hub transmits that data to the
designated device. The central computer is known as a server, and the peripheral
devices attached to the server are known as clients. Coaxial cable or RJ-45 cables
are used to connect the computers. Hubs or Switches are mainly used as
connection devices in a physical star topology.Star topology is the most popular
topology in network implementation.
Advantages of Star topology:
1. Less expensive because each device only needs one I/O port and needs to be connected
with hub with one link.
2. Easier to install.
3. Less number of cables required because each device needs to be connected with the
hub only.
4. Robust, if one link fails, other links will work just fine.
5. Easy fault detection because the link can be easily identified.
Disadvantages of Star topology:
1. If hub goes down everything goes down, none of the devices can work
without hub.
2. Hub requires more resources and regular maintenance because it is the
central system of star topology.