GRANTHAM CS216 TOPOLOGIES ETHERNET STANDARDS (FULLY SOLVED) - 22668

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1. What are the pros and cons of using a bus topology for a LAN?

2. Why do you think the ring topology has become obsolete?

3. Why is the star topology the most commonly used topology?

4. What's the difference between physical and logical topology?

5. Compare and contrast the different types of network backbone? Which is best and why?

6. What is the most popular switching method and why?

7. Name and describe the access method that all versions of Ethernet use?

8. In 10Base-T, what do the 10, the Base, and the T stand for?

9. Compare and contrast 1000Base-LX and 1000Base-SX.

10. Draw a diagram of the Ethernet_II frame and label and describe its components.

Solution Description

1. What are the pros and cons of using a bus topology for a LAN?

Answer:

Pros

  • Easy to implement and extend.
  • Easy to install.
  • Well-suited for temporary or small networks not requiring high speeds (quick setup), resulting in faster networks.
  • less expensive than other topologies (But in recent years has become less important due to devices like aswitch)
  • Cost effective; only a single cable is used.
  • Easy identification of cable faults.

Cons

  • Limited cable length and number of stations.
  • If there is a problem with the cable, the entire network breaks down.
  • Maintenance costs may be higher in the long run.
  • Performance degrades as additional computers are added or on heavy traffic (shared bandwidth).
  • Proper termination is required (loop must be in closed path).
  • Significant Capacitive Load (each bus transaction must be able to stretch to most distant link).
  • It works best with limited number of nodes.
  • Commonly has a slower data transfer rate than other topologies.
  • Only one packet can remain on the bus during one clock pulse

2. Why do you think the ring topology has become obsolete?

Answer:Any damage of the cable of any cable or device can result in the breakdown of the whole network. In addition, the more workstations that must participate in data transmission, the slower the response time. Due to these shortcomings, ring topology now has become almost obsolete. Moves, adds and changes of devices can affect the network.

 

3. Why is the star topology the most commonly used topology?

Answer:

  • Better perf
Attachments
Ethernet II Frame Format.pdf
Ethernet II Fra...