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Devices: Repeaters, Hubs, Bridges,

Switches, Routers, & Gatewaysanimation PPT Network connecting devices movieNET07

CN5E by Tanenbaum & Wetherall, Pearson Education-Prentice

Hall and D. Wetherall, 2011

Devices are named according to the layer

they process

A bridge or LAN switch operates in the Link

layer

http://localhost/var/www/apps/conversion/tmp/scratch_4/PPT%20Network%20connecting%20devices%20movieNET07.swfhttp://localhost/var/www/apps/conversion/tmp/scratch_4/PPT%20Network%20connecting%20devices%20movieNET07.swf

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TCP/IP Protocol Suite 3

CONNECTING DEVICES

LANs or WANs do not normally operate in isolation.

They are connected to one another or to the

Internet. To connect LANs and WANs together we

use connecting devices. Connecting devices canoperate in different layers of the Internet model. We

discuss three kinds of connecting devices: repeaters

(or hubs), bridges (or two-layer switches), and

routers (or three-layer switches).

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TCP/IP Protocol Suite 4

Connecting devices

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Animation PPT nic

http://localhost/var/www/apps/conversion/tmp/scratch_4/PPT%20nic.swfhttp://localhost/var/www/apps/conversion/tmp/scratch_4/PPT%20nic.swfhttp://localhost/var/www/apps/conversion/tmp/scratch_4/PPT%20nic.swf

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TCP/IP Protocol Suite 10

A repeater forwards every bit; it has nofiltering capability.

Note

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Bridge

1. A bridge has a table used in filtering

decisions.

2. A bridge does not change the physical

(MAC) ddresses in a frame.

Connects to LAN using same protocols

Has filtering capability

Each line has separate collision domain

Transparent: Stations unaware about bridge

Source Routing: Duties performed by station

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TCP/IP Protocol Suite 14

Figure 3.42 Bridge

71:2B:13:45:61:41 1

43

271:2B:13:45:61:4264:2B:13:45:61:1264:2B:13:45:61:13

Address Port

Bridge table

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TCP/IP Protocol Suite 15

Figure 3.43 Learning bridge

a. Original

Address Port

c. After D sends a frame to B

71:2B:13:45:61:41 1

464:2B:13:45:61:13

Address Port

M MM M

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Switches

PPT Filtering and no broadcasting switch

Animation PPT no collision 10-switch

Works at Data link layer

Called interchangeably with Bridge but

No broadcast:Read data in the packet find source

and destination address and send to the

destination only not baroadcast

Mostly switches used to connect individual

computer

Though node is in same network it passed

through switch which does not happened in

bridges

http://localhost/var/www/apps/conversion/tmp/scratch_4/PPT%20Filtering%20and%20no%20broadcasting%20switch.swfhttp://localhost/var/www/apps/conversion/tmp/scratch_4/PPT%20no%20collision%2010-switch.swfhttp://localhost/var/www/apps/conversion/tmp/scratch_4/PPT%20no%20collision%2010-switch.swfhttp://localhost/var/www/apps/conversion/tmp/scratch_4/PPT%20no%20collision%2010-switch.swfhttp://localhost/var/www/apps/conversion/tmp/scratch_4/PPT%20no%20collision%2010-switch.swfhttp://localhost/var/www/apps/conversion/tmp/scratch_4/PPT%20Filtering%20and%20no%20broadcasting%20switch.swf

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TCP/IP Protocol Suite 17

Figure 3.44 Routing example

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RouterAnimation PPT router

Animation PPT Multiple paths router

A repeater or a bridge connects segments

of a LAN.

A router connects independent LANs or

WANs to create an internetwork (internet).

Changes physical address of packet but not

logical address

32 or 128 bit address

If one path fails data can send from another

path

http://localhost/var/www/apps/conversion/tmp/scratch_4/PPT%2011-router.swfhttp://localhost/var/www/apps/conversion/tmp/scratch_4/PPT%20Multiple%20paths%20router.swfhttp://localhost/var/www/apps/conversion/tmp/scratch_4/PPT%20Multiple%20paths%20router.swfhttp://localhost/var/www/apps/conversion/tmp/scratch_4/PPT%2011-router.swf

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GatewaysPPT Network connecting devices movieNET07

Network point that acts as entrance to

another network i.e. controlling traffic

Used to convert in between different

protocols

Combines both modem and router

Works from layer 4 and above

http://localhost/var/www/apps/conversion/tmp/scratch_4/PPT%20Network%20connecting%20devices%20movieNET07.swfhttp://localhost/var/www/apps/conversion/tmp/scratch_4/PPT%20Network%20connecting%20devices%20movieNET07.swf

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Animation PPT firewalls

http://localhost/var/www/apps/conversion/tmp/scratch_4/PPT%20firewalls.swfhttp://localhost/var/www/apps/conversion/tmp/scratch_4/PPT%20firewalls.swf

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