Me and My World

For beginners, it is easier for you to memorize the OSI layer by this phrase “Please Do Not Throw Sausage Pizza Away”

1. Physical : Cables
2. DataLink : MAC address (unique social address for every hardware)..to find out your MAC address,if you are on Linux, you can go to your terminal, then run command “ifconfig“..if you are on Windows, you can go to your command promt, you can go to your command prompt, then run command “ipconfig”
3. Network : network security, ip addressing (public and private IP address) how a machine is accessible through theInternet. Where IP addresses are defined.
4. Transport : describe the most important protocol nowadays (TCP and UDP).The concept of statefullness. Stateful Firewall.
   • *TCP : connection-oriented protocol (rebuffer itself, air correction, acknowledgement).
   • *UDP : connectionless protocol (you can drop packages..real-time streaming.video streaming).
5. Session : establish and maintain user sessions across the network. Responsible for providing securitization. If it fails, certain session need to be retransmitted
6. Presentation : Translate application to network format and vice versa. In order to send application to the Internet. Responsible for : protocol convertion, character convertion. Seamless communication for multipleprotocol stacks. Present data to the lower level of OSI model.
7. Application : for applications specifically written to run over the network. It’s gotta access the network services. E.g: DNS,FTP,TFTP,SNMP,telnet. (smartDefense)