CCNA/CCNP preparation notes

by Andreas Ryf
OSI reference model
1: Physical Layer
2: Data Link Layer
3: Network Layer
4: Transport Layer
5: Session Layer
6: Presentation L.
7: Application Layer
IP Network Classes
Subnetting
Cables & fibres
Terms
Links
BCMSN
ONT

Layer 4: Transport layer

 

TCP/UDP

 

TCP:

Flow control, acknowledge of reception, retransmission, sequncing, connection oriented.

 

UDP does not have these features, but it is much more light and efficient (lower overhead).

 

Different applications are identified by different ports


 

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