CISCO NETWORKING ACADEMYCISCO NETWORKING ACADEMY
Chabot CollegeChabot College
ELEC 99.05ELEC 99.05Network Topologies & Connections
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Toplogies and ConnectionsToplogies and Connections
• Differing physical topologies yield equivalent ethernet traffic at the workstation.
• For UTP connections, cable type depends on the types of devices connected.
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Bus TopologyBus Topology
Bus
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Extended Star TopologyExtended Star Topology
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Equivalent EthernetsEquivalent Ethernets
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Crossover CableCrossover Cable• Transmit pair “crosses over” to Receive pair.
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Crossover CableCrossover Cable• Connects NIC to NIC.
• Connects hub to hub.
transmit pair
receive pair
transmit pair
receive pair(crossover cable)
transmit pair
receive pair
transmit pair
receive pair(crossover cable)
ACTACT10M100M
1 2 3 4
13 14 15 16
5 6 7 8
17 18 19 20
9 10 11 12
21 22 23 24
UPLINK
1 2 3 4 5 6 7 8 9 101112
131415161718192021222324COLCOL
PWR
SWITCHhubACTACT
10M100M1 2 3 4
13 14 15 16
5 6 7 8
17 18 19 20
9 10 11 12
21 22 23 24
UPLINK
1 2 3 4 5 6 7 8 9 101112
131415161718192021222324COLCOL
PWR
SWITCH hub
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Straight-Through CableStraight-Through Cable• Connects NIC to hub.
transmit pair
receive pair
transmit pair
receive pair
ACTACT10M100M
1 2 3 4
13 14 15 16
5 6 7 8
17 18 19 20
9 10 11 12
21 22 23 24
UPLINK
1 2 3 4 5 6 7 8 9 101112
131415161718192021222324COLCOL
PWR
SWITCHhub(straight through cable)
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Straight-Through CableStraight-Through Cable• When connecting two PCs via a hub,
straight-through cables are used. Where does the crossover occur?
• In the hub!
transmit pair transmit pairACTACT
10M100M1 2 3 4
13 14 15 16
5 6 7 8
17 18 19 20
9 10 11 12
21 22 23 24
UPLINK
1 2 3 4 5 6 7 8 9 101112
131415161718192021222324COLCOL
PWR
SWITCH
receive pair receive pair
hubPC1 PC2(straight through cable) (straight through cable)
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Cabling ExampleCabling Example
Straight - Thru Straight - Thru Straight - Thru
Crossover CrossoverCrossover
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Hub FeatureHub Feature
• Most hubs have a special “uplink port” that can be switched from crossover to straight-through function.
• Usually, the uplink is port 1.• The uplink allows use of straight-
through cables throughout all connections.
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Hubs with UplinkHubs with Uplink
Straight - Thru Straight - Thru Straight - Thru
SwitchableUplink Port
Straight - Thru Straight - Thru
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QuizQuiz
• NIC to NIC - what type cable?• Crossover
• NIC to hub - what type cable?• Straight-through
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QuizQuiz
• Hub to hub - what type cable??• Crossover
• Hub uplink port to hub - what type cable?• Straight-through
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QuizQuiz
• On most hubs, which port is the hub uplink on?• Port 1
• Could I attach a workstation NIC to the uplink port?
• Sure - just use a regular straight-through cable. If necessary, change the setting on the uplink port switch!
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QuizQuiz
• How can I tell if the hub’s uplink port switch is set correctly for the type of cable & device attached?
• Look for link light!
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