OSI Model Flashcards
The OSI Model layers
How many layers are in the OSI layer?
7
Name all the layers in the OSI model
Application, Presentation, Session, Transport, Network, Data Link, Physical
What does the Application layer do?
Provides network services directly to the user application; interfaces directly with the end user applications and provides services such as email, file transfer and web browsing. HTTP, FTP, SMTP, DNS, POP3, IMAP
What does the Presentation layer do?
Translates data between the application layer and the network; converts data into a format that the application layer can understand. It handles data encryption, compression and translation between different data formats. SSL/TLS, JPEG, ASCII
What does the Session layer do?
Manges session or connections between applications; establishes, manages, and terminates connection between applications. It handles session setup, coordination, and termination. (weak)
What does the Transport layer do?
Provides reliable data transfer between end systems; segments and reassembles data for communication between devices, manages error detection and correction, and ensure complete data transfer. It provides flow control, error handling, and data retransmission. TCP/UDP.
What does the Network layer do?
Manages the routing of data across the network; determines the best physical path for data to travel from the source to the destination. I handles logical addressing through IP addressing and manages packet forwarding, routing, and addressing. IP Addresses, routers, IPv4/IPv6
What does the Data Link layer do?
Provides node-to-node data transfer and handles error correction from the physical layer; packages raw bits from the physical layer into frames, handles MAC addresses, and ensures error-free data transfer between adjacent nodes. MAC Addresses, switches, bridges, PPP.
What does the Physical layer do?
Transmits raw bitstreams over a physical media; deals with the hardware elements, such as cables, switches and network interface cards. It defines the electrical, mechanical, and procedural aspects of communication. Ethernet cables, fiber optics, radio frequencies.
