What levels of the OSI model are you familiar with…

Physical Layer: Transmission of bits over physical media (cables, radio). Defines electrical, mechanical, and physical characteristics of the connection.
Data Link Layer: Organizes data transfer into frames and ensures their delivery between neighboring nodes. Responsible for error control and media access management.
```
// Protocol examples: Ethernet, Wi-Fi  
```
Network Layer: Provides routing of packets from source to destination across the network. Defines logical addresses (IP addresses).
```
// Protocol examples: IP, ICMP  
```
Transport Layer: Guarantees reliable or unreliable (depending on the protocol) delivery of data between applications on end nodes. Ensures data segmentation and flow control.
```
// Protocol examples: TCP, UDP  
```
Session Layer: Establishes, manages, and terminates communication sessions between applications. Responsible for dialogue synchronization.
Presentation Layer: Provides data transformation into a format understandable by both communication nodes (e.g., encryption, compression, encoding).
Application Layer: Provides network services to user applications. Interacts directly with programs.
```
// Protocol examples: HTTP, FTP, DNS, SMTP  
```

What levels of the OSI model are you familiar with?