Network components & connconnecting devices

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NETWORK COMPONENTS
&
CONNCONNECTING DEVICES

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CONNECTING DEVICES

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CONNECTING DEVICES
LANs or WANs do not normally operate in isolation.
To connect LANs and WANs together we use
connecting devices.
Connecting devices can operate in different layers of
the Internet model.
three kinds of connecting devices:
repeaters (or hubs),
bridges (or two-layer switches), and
routers
(or three-layer switches).
TCP/IP Protocol Suite
11

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TCP/IP Protocol Suite
12

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Repeater or hub
Sent
Maintained
TCP/IP Protocol Suite
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A repeater forwards every bit; it has no filtering capability.

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Bridge table
Address
Port
1
71:2B:13:45:61:41
2
71:2B:13:45:61:42
3
64:2B:13:45:61:12
4
64:2B:13:45:61:13
A bridge has a table used
in filtering decisions.

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A Switch does not change the physical (MAC) addresses
in a frame.

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Address
Port
a. Original
Address
71:2B:13:45:61:41
64:2B:13:45:61:13
Port
1
4
c. After D sends a frame to B
M
TCP/IP Protocol Suite
Address
Port
71:2B:13:45:61:41
1
64:2B:13:45:61:13
4
71:2B:13:45:61:42
2
64:2B:13:45:61:12
3
e. After C sends a frame to D
Address
Port
71:2B:13:45:61:41
1
64:2B:13:45:61:13
4
71:2B:13:45:61:42
2
d. After B sends a frame to A
M
M
20
M

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A repeater or a bridge connects
segments of a LAN.
A router connects independent
LANs or WANs to create an
internetwork (internet).
A router changes the physical
addresses in a packet.
A router is a three-layer device
(physical, data link, and network).

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Network