OSI Layer on CCNA

1. Introduction to TCP/IP
Networking
WILL DISCUSS ABOUT NETWORK, PROTOCOL, TCP/IP, OSI ETC.,
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2. Overview
Network is not a single concept it’s a combination of lot of different components.
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3. Perspectives on Networking
Your perspective about networks might be that of a user of the network, as opposed to the network
engineer.
Daily Network works :Sending email, browsing websites,making Internet phone calls, and using other tools
and applications.
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4. Types of Network in layman point
Home
Enterprise
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5. TCP/IP Networking Model
It is the Blueprint for Network Engineers
Network : Connecting two or more devices to exchange valuable information
Protocol : Rules governing the communication.
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6. History of TCP
Multivendor communication was hard.
ISO - > OSI Model
DoD -> TCP/IP *
◦ TCP/IP model was developed by whole
bunch of volunteers
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7. Overview of TCP/IP
What is RFC ?
TCP/IP model uses Layers for the ease of understanding it.
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We will study one by one now

8. 1.TCP/IP Application Layer
Provide services to the application software running on a computer.
It defines the application running behind a software to connect the software to internet.
HTTP Overview
HTTP Protocol Mechanisms
**HTTP did not exist until Tim Berners-Lee created the first web browser
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9. One step in what HTTP
◦ Header is a place to put information used by the protocol.
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10. 2. TCP/IP Transport Layer
TCP and UDP
It provides services to application layer protocol.
A. TCP Error Recovery Basics
◦ This is provided to Application layer by Transport Layer.
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11. 3. TCP/IP Network Layer
Addressing and routing.
IP address.
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12. End to End connection.
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13. TCP/IP Data-Link and Physical Layers
Switches-MAC Address
Ethernet cables- Electrical signals, light signals.
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14. Data Encapsulation Terminology
Data encapsulates
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15. OSI and TCP/IP Model comparison
OSI is a 7 layer model and TCP/IP is 4 layer model.
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