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© 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.0—2-1
Ethernet LANs
Understanding the
Challenges of
Shared LANs
© 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.0—2-2
 Signals degrade with transmission distance.
 Each Ethernet type has a maximum segment length.
LAN Segment Limitations
© 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.0—2-3
Extending LAN Segments
 Shares bandwidth
 Extends cable distances
 Repeats or amplifies signal
© 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.0—2-4
Collisions
© 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.0—2-5
Multiple Collision Domains
© 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.0—2-6
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.
© 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.0—2-7
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.
© 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.0—2-8

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CCNA Icnd110 s02l01

  • 1. © 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.0—2-1 Ethernet LANs Understanding the Challenges of Shared LANs
  • 2. © 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.0—2-2  Signals degrade with transmission distance.  Each Ethernet type has a maximum segment length. LAN Segment Limitations
  • 3. © 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.0—2-3 Extending LAN Segments  Shares bandwidth  Extends cable distances  Repeats or amplifies signal
  • 4. © 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.0—2-4 Collisions
  • 5. © 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.0—2-5 Multiple Collision Domains
  • 6. © 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.0—2-6 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.
  • 7. © 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.0—2-7 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.
  • 8. © 2007 Cisco Systems, Inc. All rights reserved. ICND1 v1.0—2-8

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