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Teracom Training Institute Online Course Lesson L1175: OSI Layers and Protocol Stacks - Introduction
Publisher: Teracom Training Institute
Publisher Link: http://www.teracomtraining.com
Media: H.264 video, 720p Release Date: 2011 04 26
Watch this in full quality at https://www.teracomtraining.com/cart/largeview/69
The OSI Layers and protocols touch every aspect of communications. We'll understand open systems, the difference between a protocol and a standard, understand all of the functions that must be done to interoperate systems, how the functions are organized into manageable pieces with the ISO Open Systems Interconnect (OSI) 7-layer reference model, and examples of popular ways of implementing the layers to make a protocol stack. You'll learn what a layer is, the purpose of each layer, see examples of protocols used to implement each layer, and learn how a protocol stack really works with the famous "FedEx Analogy" presented as an embedded video by our top instructor, Eric Coll.
Lessons in this module:
1. Module Introduction - OSI Layers and Protocol Stacks (this lesson)
2. Open Systems
3. Protocols and Standards
4. The ISO OSI 7-Layer Reference Model
5. The Physical Layer: Fiber, Twisted Pair, Cable and Wireless
6. Data Link Layer: LANs and MAC Addresses
7. Network Layer: IP, MPLS, Packets and Routers
8. Transport Layer, Ports and Sockets
9. Session Layer: SIP, POP and HTTP
10. Presentation Layer: ASCII, MIME, Data Compression, Encryption, Codecs
11. Application Layer: SMTP, HTML and English
12. Protocol Stacks: The FedEx Analogy
13. Protocol Headers and Babushka Dolls
14. Standards Organizations
This lesson is the introduction to the module, listing the objectives of the module and previewing the order, timing and pacing of the lessons in the module.
In previous modules, we covered building blocks and fundamental concepts like frames and packets, analog and digital, local cabling systems and more.
Our discussion now shifts to putting all of these pieces together: networking.
There are so many functions that need to be performed to be able to interwork different systems, a structure is required to be able to categorize and separate functions, so that it is possible to discuss separate issues separately and not mix things up.
The method most commonly used to enable discussion of separate issues separately is the ISO OSI 7-layer Reference Model.
We'll start our discussion with some definitions, then an overview of the OSI model, introducing the ideas of layers, layered architectures and protocol stacks.
Then we'll go through the layers individually and give examples of protocols like IP, TCP, LANs and DSL to see where they fit into the stack.
We'll finish off understanding how a protocol stack actually works in operation, and conclude the module with a review of different active standards organizations.
The objective of this module is to understand:
• The concept of an open system and its advantages
• What a protocol is and what a standard is
• The OSI Model and its purpose
• What a Layer is
• The seven layers of the OSI model
• The name of each layer
• The functions each layer is responsible for
• Examples of actual protocols for each layer
• What a protocol stack is and how it operates
• Examples of standards organizations that publish protocols