Friday, December 11, 2009

OSI Model

So I put off the OSI model for a bit since I didn't understand. The book teaches you about it in the second chapter. Maybe they want to teach it early so you have a basis for everything else but I found it complicated. After reading a few chapters I've gone back to it and things seem clearer. I understand the function of each layer, what I need to do is memorize it. Here's my summary of all seven layers.

The Application layer is where a user interacts with the computer like viewing a webpage.

The Presentation layer translates data into a standard format which allows different programs in the Application layer to understand it.

The Session layer organizes communications so different application's data doesn't interfere with one another.

The Transport layer segments and reasembles data into a data stream. That one is from the book since I can't think of anything else.

The Network layer manages addressing of the network, like a post office, and chooses the best route to send the data.

The Data Link layer ensures data reaches the proper destination on a LAN through hardware addressing and also translates data into bits for the physical layer.

The Physical layer is what the name implies. It transmits data using bits, 1's and 0's, and does it through multiple means like audio tones or electricity.

The chapter also touches on encapsulation a bit. Basically every layer data is encapsulated or wrapped in protocol information for that layer.

So that's it. Yep... Mmmm. Quite the use of the word the... You know I also solved a little wireless problem earlier in the week too! That alone should be worth 4 points. Even then you wouldn't grade anyone lower than a four when you've just seen that cute face :3

cute cat eyes Pictures, Images and Photos
It actually looks a bit creepy if you look at it too long.

1 comment:

  1. OK, I've already given you your assignment: stop by room 217 at Yorktown and look at Courtney Riley's Poem about the OSI Model on the wall. It will be much more meaningful to you now ;-)

    The specifics of the 7 layers are actually less important (since our real network stack -- TCP/IP -- actually has only 4 layers) than the motivation behind a layered architecture.