CCNA Icnd110 s02l01

© 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.0—2-1
Ethernet LANs
Understanding the
Challenges of
Shared LANs

 Signals degrade with transmission distance.
 Each Ethernet type has a maximum segment length.
LAN Segment Limitations

Extending LAN Segments
 Shares bandwidth
 Extends cable distances
 Repeats or amplifies signal

Collisions

Multiple Collision Domains

Summary
 A segment is a network connection made by a single unbroken
network cable. Ethernet cables and segments can span only a
limited physical distance, after which transmissions become
degraded.
 A hub extends network segments by receiving incoming bits,
amplifying the electrical signal, and transmitting these bits through
all of its ports to the other devices on the network.
 If two or more stations on a segment transmit at the same time, a
collision results.

Summary (Cont.)
 The network segments that share the same bandwidth are called
collision domains because when two or more devices
communicate at the same time, collisions may occur within that
segment.
 It is possible to use other network devices operating at Layer 2
(or above) of the OSI model to divide network segments to reduce
the number of devices that are competing for bandwidth on a
given segment and to provide more bandwidth to the devices in
the segment.

CCNA Icnd110 s02l01

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CCNA Icnd110 s02l01

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