Page 44 - Handout Computer Network.

https://www.youtube.com/watch?v=mpFWIZ318eQ

2.10.1.1 Bus Topology

Commonly called a linear bus, a bus topology connects all the devices using a single cable, see
Figure 2-21. This cable proceeds from one computer to the next like a bus line going through a city.

Figure 2-21 shown a Bus Topology of Network Devices

With a physical bus topology, the main cable segment must end with a terminator that absorbs
the signal when it reaches the end of the line or wire. If there is no terminator, the electrical signal
representing the data bounces back at the end of the wire, causing errors in the network.
https://www.youtube.com/watch?v=dMUOQj4AwB0

2.10.1.2 Star and Extended-Star Topologies

The star topology, shown in Figure below, is the most commonly used physical topology in
Ethernet LANs. When installed, the star topology resembles spokes in a bicycle wheel. The star
topology is made up of a central connection point that is a device such as a hub, switch, or router,
where all the cabling segments meet. Each host in the network is connected to the central device with
its own cable.
Although a physical star topology costs more to implement than the physical bus topology,
the advantages of a star topology make it worth the additional cost. Because each host is connected
to the central device with its own cable, when that cable has a problem, only that host is affected; the
rest of the network remains operational.
This benefit is extremely important and is why virtually every newly designed Ethernet LAN
has a physical star topology. A central connection point might be desirable for security or restricted
access, but this is also a main disadvantage of a star topology. If the central device fails, the whole
network becomes disconnected, s shown in Figure 2-22.

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