Computer Network Technology

1
Computer Network Technology

• Sri Sharma
• Oakland University
• Spring 2003

2
Technology and Management

• What are the technologies that need to managed?
• Challenges of technological progress onnetwork
  management

3
Computer Network Technology

• Network comprises
• Nodes
• Links
• Topology How theyre configured
• LAN
• WAN

4
LANs

• Type of LANs
• Ethernet
• Fast Ethernet
• Gigabit Ethernet
• Half-duplex Vs Full-duplex
• Switched Ethernet
• VLAN
• Token ring
• FDDI
• ATM / LANE

5
Nodes

• Hubs
• Bridges
• Remote bridges
• Routers
• Gateways
• Half bridge / half router
• Switches

6
WANs

• Facilities / Media
• Wired
• Copper
• Coaxial
• Fiber
• Wireless
• Terrestrial
• Satellite
• Mode
• Digital
• Analog

7
WANs (contd.)

• Services
• POTS
• ISDN
• Broadband

8
Basic LAN Topologies
9
Basic LAN Topologies (contd.)
10
Star Hybrid LAN Topologies
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A Campus Network

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WAN Topologies
13
Ethernet
14
Fast Ethernet
4-pair UTP
Hub
Station
15
LAN Data Rate Race
ENet 10Mbps
FDDI 100 Mbps
Fast ENet 100Mbps
ATM 155.52 Mbps
Gbit ENet 1 Gbps
Duplex Enets
ATM OC-n
16
Gigbit Ethernet
17
Switched Ethernet
18
Client/Server Configuration Using Switched Hub
19
Virtual LAN
20
Token Ring
21
Dual Ring TR LAN
22
Failure Recovery in TR LAN
23
FDDI
24
Basic Network Nodes
25
Network Node Components
26
Hubs
27
Stacked Hubs
28
Hubs and Switches Desktop
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Hubs and Switches 19 Stackable/Rack-Mountable
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Hubs and Switches 19 Stackable/Rack-Mountable
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Hub Operation
Station A1-44-D5-1F-AA-4C Transmits a bit. Hub
broadcasts the bit out all ports.
Ethernet Hub
UTP
UTP
D4-47-55-C4-B6-9F
UTP
UTP
C3-2D-55-3B-A9-4F
A1-44-D5-1F-AA-4C
B2-CD-13-5B-E4-65
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Transmitting with a Hub
Ethernet Hub
Station A1-44-D5-1F-AA-4C is transmitting. Station
B2-CD-13-5B-E4-65 wishes to transmit. It must
wait.
UTP
UTP
D4-47-55-C4-B6-9F
UTP
UTP
C3-2D-55-3B-A9-4F
A1-44-D5-1F-AA-4C Transmitting
B2-CD-13-5B-E4-65 Waiting
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Transmitting with a Hub

• Waiting creates latency (delay)
• Becomes intolerable with many stations
• Not a problem for very small networks
• Speed of hub is shared by all stationseach gets
  only a fraction

34
Switch Operation
Ethernet Switch
A switch sends a frame out a single port the one
to the receiver
UTP
D4-47-55-C4-B6-9F On Switch Port 16
UTP
UTP
UTP
Frame
Frame
C3-2D-55-3B-A9-4F On Switch Port 15
A1-44-D5-1F-AA-4C On Switch Port 10
B2-CD-13-5B-E4-65 On Switch Port 13
35
Switch Operation with Multiple Simultaneous
Conversations
Ethernet Switch
Multiple simultaneous conversations are possible
UTP
D4-47-55-C4-B6-9F On Switch Port 16
UTP
UTP
UTP
C3-2D-55-3B-A9-4F On Switch Port 15
36
Bridges
Bridge
Local Bridge
Remote Bridge
Simple
Multiport
Multiport Multi-protocol
37
Routers
38
Gateway
39
Tunneling
Joes Mobile Loc Seattle
Home LAN NY
Tunneling
Foreign Agent
Sally L.A
40
Half-Bridge
41
Switched Networks
42
Switched Networks (contd.)
43
Transmission Technology
Transmission Technology
Medium
Mode
Wired
Wireless
Digital
Analog
LAN
WAN
LAN Mobile Satellite
44
Transmission Modes
45
Broadband Services