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What is so important about network frame size?


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#1 balcobulls

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Posted 20 October 2015 - 10:26 PM

I constantly see tutorials of conducting pings. Many steps are focused around finding the exact frame size of the network you are seeking. How can finding the exact frame size assist me in footprinting and/or scanning a network?

Thank you for your time and answers!



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#2 patrick.croner

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Posted 22 October 2015 - 01:19 PM

Hey,

 

Knowing your networks frame sizes enables you to ensure that your users' message traffic gets to where it needs to go quickly and accurately.

 

Suppose your corporate mailroom is equipped only to handle letter- and business-sized envelopes and is not equipped to handle postcards or larger legal-sized envelopes. The letter-sized envelope is the minimum size, and the business-sized envelope is the maximum sized "frame" allowed by your mailroom. Anything smaller than the letter-sized envelope, such as a postcard, might be considered a runt, and anything larger than the business-sized envelope might be considered a giant.

 

The image demonstrates  the concept of a minimum and maximum frame size, and the result, in a corporate mailroom.

fig06.jpg

 

In this mailroom (switch) scenario, both the postcards (runts) and legal-sized envelopes (giants) would not be accepted by the mailroom (the switch) and therefore would be dropped into the trash.

NOTE

The maximum frame size is also known as the maximum transmission unit, or MTU. When a frame is larger than the MTU, it is broken down, or fragmented, into smaller pieces by the Layer 3 protocol to accommodate the MTU of the network.

 

For more info refer to: http://www.ciscopress.com/articles/article.asp?p=357103&seqNum=3



#3 balcobulls

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Posted 22 October 2015 - 05:25 PM

Thank you very much....I even got a picture out of it!  I really do appreciate your explaination and the quick response.






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