Tell me about the OSI model levels.

Physical: Responsible for transmitting raw bits of data over physical media (cables, Wi-Fi). Defines electrical, mechanical, and procedural parameters of communication.

Data Link: Ensures the transfer of data frames between neighboring nodes, detects and corrects errors at the physical layer. Includes flow control and media access control. Divided into LLC (Logical Link Control) and MAC (Media Access Control).

Network: Determines routes for transmitting data packets from sender to receiver across multiple networks. Uses IP addressing and routing protocols.

Transport: Provides reliable and efficient data transfer between processes on end devices. Segments data for sending and reassembles it upon receipt. Examples: TCP (Connection-Oriented, reliable) and UDP (Connectionless, unreliable).

Session: Manages dialogues between applications, establishes, maintains, and terminates communication sessions. Synchronizes data exchange.

Presentation: Responsible for converting data into a format understandable by the application layer and vice versa. Performs encryption/decryption and compression/decompression.

Application: Provides network services for user applications. Facilitates interaction between user software and the network. Protocol examples: HTTP, FTP, SMTP.