Network Interconnections

Why Interconnect LANs?

Need to communicate and share information with another group.


Why Interconnect LANs?


Why Interconnect LANs?


Local Segment interconnectivity


Wide Area Connectivity


OSI Model and connectivity devices

The OSI Reference Model is a good conceptual framework to help understand the various connectivity devices.


OSI Model and connectivity devices

Each device is designed to operate at specific layers of the OSI Model.


OSI Model and connectivity devices


OSI Model
OSI Model Picture


OSI & Repeaters
OSI Model Picture


OSI & Bridges
OSI Model Picture


OSI & Routers
OSI Model Picture


OSI & Gateways
OSI Model Picture


Repeaters


Repeaters

Repeaters simply take in a digital signal from one segment, boost it to it's original strength and send it out on the other segment.


Repeaters

Repeaters exist for


Repeaters

A network built with repeaters is simply one large extended segment.


Repeaters

All addresses on segments connected with repeaters must be unique.


Repeaters


Repeaters


Repeaters


Bridges & Switches


Bridges & Switches


Bridges & Switches


Bridges & Switches

Bridge Function:


Bridges & Switches

Information to make the decision to pass (or not) may come from one of the following


Bridges & Switches

If the information used to make the decision comes from the bridge tables it is a
Transparent Bridge


Bridges & Switches

If the information used to make the decision comes from within the frames it is a
Source Routing Bridge


Bridges & Switches

Bridges may connect different network types based on what level they operate


Bridges & Switches

Media Access Control (MAC Layer) Bridges


Bridges & Switches

Logical Link Control (LLC Layer) Bridges


Bridges & Switches


Bridges & Switches

Transparent Bridge


Bridges & Switches

Transparent Bridge


Bridges & Switches

Transparent Bridge


Bridges & Switches

Source Routing Bridge


Bridges & Switches

Source Routing Bridge


Bridges & Switches

Source Routing Bridge - Discovery


Bridges & Switches

Source Routing Bridge - Discovery


Bridges & Switches

Source Routing Bridge - Discovery


Bridges & Switches

Source Routing Bridge


Bridges & Switches

Preventing endless tokens


Bridges & Switches

Mixed bridges


Bridges & Switches

Switching


Bridges & Switches

Implementation variations


Bridges & Switches

Bridge Addressability


Bridges & Switches

Bridge Implementation


Bridges & Switches

Bridge Implementation

Remote bridge is called "Split Bridge"


Bridges & Switches

Bridge Implementation

Local bridges


Routers


Routers


Routers

Conceptually, routing is...


Routers

To be routed, two address are needed


Routers

Messages are addressed to the routers


Routers

In order to be routed...


Routers


Routers

Multi-Protocol Routers


Routers

Single-Protocol Routers


Routers

Reasons to Route


Routers

Ways to route


Routers

In a routed network:


Routers

If the protocol is TCP/IP


Routers

If the protocol is AppleTalk


Routers

Protocol Routing


Routers

Non-Routable protocols


Brouters

Brouters Bridge some protocols and Route others.


Brouters


Gateways


Gateways


Gateways


Gateways


Gateways

Complete translation is possible


Gateways

Most common gateway is to host (SNA)


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