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6
Introduction
♦ The maximum length of a twisted-pair segment (that is, distance
between a port in the hub to a single-address network device such as a
PC, server, or LAN switch) is 100 meters.
♦ The maximum diameter in a collision domain is about 205 meters
using two Class II hubs and 200 meters using one Class I hub.
♦ Between any two end-stations in a collision domain, there may be up
to three segments and two Class II hubs or two segments and one
Class I hub.
Ethernet Switching Introduction
Another approach to pushing beyond the limits of Ethernet technology is the
development of switching technology. A switch bridges Ethernet packets at
the lowest (MAC address) level between connected Ethernet or Fast Ethernet
LAN segments.
Switching is a cost-effective way of increasing the total network capacity
available to users on a local area network. A switch increases capacity and
decreases network loading by making it possible for a local area network to
be divided into different segments (also called collision domains) which
don’t compete with each other for network transmission capacity, giving a
decreased load on each.
The switch acts as a high-speed selective bridge between the individual
segments. Traffic that needs to go from one segment to another is
automatically forwarded by the switch, without interfering with any other
segments. This allows the total network capacity to be multiplied, while still
maintaining the same network cabling and adapter cards.
For Fast Ethernet networks, a switch is an effective way of eliminating
problems of chaining hubs beyond the “two-repeater limit.” A switch can be
used to split parts of the network into different collision domains, making it
possible to expand your Fast Ethernet network beyond the 205 meter