The document discusses star network topology, its advantages, and switching mechanisms. A star topology uses a central hub or switch that connects all computers. Key advantages are that removing one connection does not paralyze the network, and failures are less likely than with a bus topology. However, the hub is a single point of failure and cabling costs are higher. The document also covers cut-through and store-and-forward switching mechanisms.

1. Star Network and its
advantages
.
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2. In the previous classes, you have learnt about
 Store and forward switch
 Cut through switch mechanisms
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3. On completion of this period, you would be able
to know about
 Star Network topology
 Its Advantages
 Store and Forward and adaptive switching mechanism
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4.  Star Network Topology Fig.1 illustrates the star
network topology
• A star topology typically uses a network hub or
switch and is common in home networks
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5. HUB
Fig.1 Star Network
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6.  In star topology, the network computers are linked to a
piece of hardware called a hub
 This is a box which contains a certain number of
sockets into which cables coming out of the computers
can be plugged
 Its role is to ensure communications between those
sockets
 Unlike networks built with bus topology, networks
which use star topology are much less vulnerable
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7. Advantages of Star Configuration
 one of the connections can easily be removed by
disconnecting it from the hub, without paralyzing the
rest of the network
 The critical point in this network is the hub, as without
it, communication between the computers on the
network is no longer possible
 However, a star topology network is bulkier than a bus
network, as additional hardware is required (the hub)
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8. Disadvantages of Star Configuration
 If the central hub fails, the whole network fails
 The cabling cost is more
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9. In this class, you have learnt about
 Star Network topology
 Its Advantages
 Cut through and Store and Forward and adaptive
switch mechanism
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10. 1. Main advantage of star topology _________
Ans: It works even if one or many nodes fail
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11. Quiz
2. Adaptive Switch Fabric Architecture enables to
incorporate _________ PCI bus segments
Ans : 224
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12. 1. Explain Star topology
2. List the Different switch architecture
3. Explain Store and forward cut through switch mechanism
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