Intro to the OSI Model and TCP/IP Protocol Suite

Covers the function and purpose of the layers in the OSI Model and TCP/IP Protocol Suite.

OSI Model
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7. Application* - Programs and Services
6. Presentation* - file formats, compression
5. Session* - open, close and manage sessions between end-user application processes
4. Transport - Ports, logical communication between application processes
3. Network - Logical Addressing, Routers
2. Data Link+ - Physical Addressing, Switches, NICs
1. Physical+ - Bits, Media (copper, fiber, radio), NICs, Hubs

7. Application* - HTTP, HTTPS, DNS, FTP, SMTP, Telnet, SSH, DHCP, SSL/TLS
6. Presentation* - MIME
5. Session* - RTP, SOCKS
4. Transport - TCP, UDP
3. Network - IPv4, IPv6, ICMP, ICMPv6, IPSec
2. Data Link+ - MAC addressing, Ethernet, WiFi, DSL, PPP,
1. Physical+ - Encoding bits to 1 and 0 s on the media

TCP/IP Protocol Suite PDU Header
==============================================
Application Layer* Data Application specific fields
Transport Layer Segments source & destination port numbers (host & service)
Internet Layer Datagrams source & destination ip addresses
Link Layer+ Frames source & destinatation mac addresses

[yaboi]

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[SkyFly]

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[cynthiaroy]

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[edbobadilla]

Thank you so much for continue doing these videos.

[ijereblessed]

Thank you very much for routers and switches program in tutorial

[kartheekbabu]

Great Great efforts.. putting all in one place❤

[mohamedshameem]

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[vladimirfortushin]

Thank you for that Sausage Pizza, really)

[spectralknights]

Nice! Will u do the new updated ccna course videos?

[rohitkumar-esuc]

I have a doubt here, whether Ssl/TLS is part of application layer, or it should be at Presentation or Session layer ?

[abdchuhan]

I always wonder why we have network layer above than data link layer i.e. order-wise request from Host first reaches to the Switch rather than Router… Anyone have answer for it, kindly respond.

[satorlcd]

it would be great if it had a translation in Spanish, thanks a lot.

[mubarishussain]

Please (Physical Layer)
Do (Data Link Layer)
Not (Network Layer)
Tell (Transport Layer)
secret (Session Layer)
Password (Presentation Layer)
Anyone ( Application Layer )