Mar 25, 2013

network_health_print

We created these diagrams to help us better understand computer networks.

The diagrams use two computer networks—a small office network and sections of a large enterprise network—as reference networks.

The reference networks contain examples of most typical device types, their network addresses, and suggest how the devices might be connected. For some devices, key tables—such as routing tables—are shown. All of the computers and routers maintain and use several tables. (To keep the diagram simple, not all tables are shown.)

We overlaid two different types of network traffic on the reference network. Green lines show the flow of packets in a simple network operation (printing a document to printers in different locations).

network_health_detail

Each packet of each file that is sent has a source address and a destination address. The routers check their routing tables to see if the destination address is inside the router’s subnet. If it is, the router routes the packet to the local address. If not, the router passes the packets on to the next hop.

Magenta lines show the flow of traffic in a more complex operation that goes out into the internet (sending an email from the enterprise network to the small office network). Readers can trace the path of a message through various routers in the network.

network_health_email





How to read the diagrams
The diagrams contain four layers of information.

network_health_how_to_read

1. Sections
Each diagram is organized in three main sections: small office, internet services, and enterprise (which is divided into additional sub-sections).

2. Devices + Connections
Devices (and the connections between them) are indicated with boxes. Some devices have callouts which reveal additional internal components. Redundant devices are shown in blue.

3. Subnets
Colored areas indicate subnets.

4. Network Traffic
Network traffic is shown as lines connecting devices (sometimes spanning different subnets).


Very special thanks to Paul Devine for his expertise and patience. He helped us deconstruct and reconstruct our reference networks.


Download PDF of Print Activity
Download PDF of Email Activity

4 Comments

  • karhtiki

    Feb 23, 2017
    12:23 pm

    nic apost

  • USPS Tracking

    Feb 23, 2017
    12:24 pm

    nice post

  • USPS Tracking

    Feb 23, 2017
    12:25 pm

    great article

  • [url=http://uspstrackingz.com/]USPS tracking[/url]

    Feb 23, 2017
    12:26 pm

    fantastic and nicearticle

Leave a Comment