Cisco - CCNA Certification 200-301 - OSI Model Part 2. 06

Sixth Video in a Series covering all elements of Cisco Certified Network Associate (200-301 CCNA)

 Full course: https://tinyurl.com/yah4k49x

We finally get a slice of the action, starting to review each layer of the OSI model in more detail. In this video we finish the upper layers and squeeze in the Transport Layer at the end.

Application Layer
-Interacts with user applications (Networking applications like Web browsers and Email Clients)
-This is the layer our end users sit
-Applications which sit here include: telnet, FTP, SFTP, HTTP, SMTP, POP3, DNS and many many more

Presentation Layer
-Performs encryption, decryption, compression and decompression
-Ensures the data is presented correctly
-Protocols which sit here include: JPEG, ASCII, .MP3, .WAV

Session Layer
-Tracks connections between hosts and remote hosts
-Duplex negotiations
-Keeps track of multiple sessions using port numbers
-Can reserves port numbers (Depending on application) which are later passed down to the TCP layer for TCP to populate its PDU

Transport Layer
-Two main protocols work here: TCP/UDP
-This is the layers which populates its PDU with Port numbers
-These ports are sometimes reserved by the session layer or by the Transport Layer

TCP
Connection-Oriented
-Data is exchange reliably using sequence numbers, acknowledgments, flow-control and retransmissions
-TCP setups a three ways handshake to achieve the above

UDP
-Connectionless
-No reliability or retranmission
-Just sends and hopes for the best

If you find this video to be helpful, please do leave a Like or better still, subscribe. This allows me to establish how helpful these videos are and if I should continue with this video series

The course itself will cover everything required to pass your CCNA 200-301 exam

📚Books! 🎓🎓

CCNA 200-301 Official Cert Guide - https://amzn.to/2V1qeGk

My fav books:
Routing TCP/IP Volume I (CCIE Professional Development): Authorized CCIE Preparation: v. 1 - https://amzn.to/2LEGLgx

Routing TCP/IP (CCIE Professional Development): Volume 2 - https://amzn.to/2VgobuB

Learn all about TCP: - https://amzn.to/2JyHY6s
Another great TCP book - https://amzn.to/2EfO0ph

📚Books 🎓🎓

Cisco CCNA Course
Cisco CCNA 200-301
CCNA 200-301 Training
CCNA 200-301 Full Course
CCNA 200-301 Study
CCNA 200-301 Tutorials
CCNA 200-301 Full Course

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