Extend (kỹ THUẬT TRUYỀN số LIỆU SLIDE)

Connecting LANs,
Backbone
Networks, and
Virtual LANs


Outline




Network connecting devices
Backbone networks
Virtual LANs

2


Network Connecting
Devices

3


Layer-1 Connecting
Devices

4


Repeaters



Connected segments become single
collision domain

5


Repeater Function

6


Hubs



Similar to multiport repeaters
All segments belong to the same
collision domain

7


Layer-2 Connecting
Devices

8

Bridges


Bridges process information up to the
frame-level (layer 2)

9


Bridges


Connecting LANs while separating collision
domains



MAC addresses are used for filtering
Connected segments form a single network
(same broadcast domain)

10


Learning Bridges
AD

EA

BC

11


Loop Problem

12


Graph Representation

13


Creating Spanning Tree

14


Blocking Ports

15


Switches



Similar to multiport bridges
Also run Spanning-Tree Protocol

16


Layer-3 Connecting
Devices

17


Routers




Capable of connecting networks of
different types
Routers separate networks into
different broadcast domains

18


Backbone Networks


Bus Backbone

20

Star Backbone

21


Connecting Remote LANs

22


Virtual LANs


Regular Switch


Three LANs are connected by a regular
switch, forming one LAN (one
broadcast domain)

24


Switch with VLAN
Feature




Different VLANs belong to different broadcast
domains
They are considered isolated networks

25