ethernet interfaces

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introduction

An ethernet interface is often referred to as a port. A computer port is vageuly in the same spirit as an airport and seaport: it's a place that a lot of traffic passes through. Port is a lot easier to say than "ethernet interface" and is used more.

LIC computers have a high port density compared to domestic computers, like those in a typical home network. Port density is the number of ports on each computer.

what it is

Each PC has many interfaces. I use network cables to connect each PC to the ethernet switches.

PCs

Each IBM PC has three or four data cables hanging out the back.

The yellow route (the highway of the biz01 network) carries the traffic of all the red routes combined. These ethernet interfaces are hopefully provided by 1 gigabit NICs. If the yellow route fails the green route (the highway of the biz02 network) takes over. It needs the same high bandwidth.

I enlarged the PCs from the data cables diagram and labelled each ethernet interface.

LIC topology: ethernet interfaces
3 data network container PCs 3 application host PCs 2 external PCs
eth1
eth2
eth3
eth0
eth1
eth2
eth3
eth1
eth2
eth0
eth1
eth2
eth0
 

Each PC comes with eth0 only. I have to buy NICs (Network Interface Cards) to provide the rest.

ethernet switches

This tells me how many switch ports I need. The minimum is below. If I want to be able to add more computers later to grow the LIC then I need to double these numbers.

  • The yellow and red cables lead to ces01. This switch must have at least 8 ports and be able to do VLANs.
  • The green and blue cables lead to ces02. This switch must also have at least 8 ports and be able to do VLANs.
  • The grey cables lead to ces03 (except the one to the home network). This switch must have at least 12 ports and be able to do VLANs.