Smc-networks 100 Manuel d'utilisateur télécharger pdf (Page 29)

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HAPTER

ETWORK

LANNING

Introduction to Switching

A network switch allows simultaneous transmission of multiple

packets via non-crossbar switching. This means that it can partition

a network more efficiently than bridges or routers. The switch has,

therefore, been recognized as one of the most important building

blocks for today’s networking technology.

When performance bottlenecks are caused by congestion at the

network access point (such as the network card for a high-volume

file server), the device experiencing congestion (server, power

user or hub) can be attached directly to a switched port. And, by

using full-duplex mode, the bandwidth of the dedicated segment

can be doubled to maximize throughput.

When networks are based on repeater (hub) technology, the

maximum distance between end stations is limited. For Ethernet,

there may be up to four hubs between any pair of stations; for Fast

Ethernet, the maximum is two. This is known as the hop count.

However, a switch turns the hop count back to zero. So

subdividing the network into smaller and more manageable

segments, and linking them to the larger network by means of a

switch, removes this limitation.

A switch can be easily configured in any Ethernet or Fast Ethernet

network to significantly boost bandwidth while using conventional

cabling and network cards.

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Smc-networks 100 Manuel d'utilisateur Page 29