Рет қаралды 734,212
Join the Discord Server!
/ discord
---------------------
MY FULL CCNA COURSE
📹 CCNA - certbros.teach...
FREE CCNA FLASHCARDS
🃏 CCNA Flashcards - certbros.com/c...
HOW TO PASS THE CCNA
📚 Get a great book - amzn.to/3f16QA5
📹 Take a video course - certbros.teach...
✔ Use practice exams - www.certbros.c...
SOCIAL
🐦 Twitter - / certbros
📸 Instagram - / certbros
👔 LinkedIn - / certbros
💬 Discord - www.certbros.c...
Disclaimer: These are affiliate links. If you purchase using these links, I'll receive a small commission at no extra charge to you.
---------------------------------------------------------------------------------------------------------------
What is the TCP/IP model? It's a model to standardise computer networking.
The OSI model, while widely referenced isn't used in the real world. The TCP/IP model, however, is the real deal. Thankfully, it's not all that different.
Here is the original TCP/IP model.
Application, Transport, Internet, and Link.
Just like the OSI model, it's numbered from the bottom up but the direction depends if you're sending or receiving traffic.
So this is the original TCP/IP model, but, it has been updated.
The link-layer has been split into Data Link and Physical
and the Internet Layer has been renamed the Network layer.
Layer 5: Application protocols such as HTTP, FTP, and SMTP
Layer 4: The two most common transport protocols are TCP and UDP.
Port numbers are also added here.
Layer 3: At the Network layer, we have the Internet Protocol or IP.
Routers also commonly operate at this layer
Layer 2: The data link layer contains Ethernet related protocols.
Switches usually operate at this layer. Although you can get layer 3 switches that have routing capabilities
Layer 1: Think of everything you can touch and feel here.
Things like cables, hubs and Network interface cards.
#ccna #cisco #networking