Do you know what the OSI model is? How many layers does it have? Can you tell about them? What experience do you have with Go and C/C++? key: suricata, dpi, pcap, wireshark, zeek Which addresses are considered local and private? Provide examples of local addresses.

The OSI (Open Systems Interconnection) model is a conceptual model that describes the interaction of network protocols in seven layers:

1. Physical — transmission of bits over a physical channel (cables, radio channels).
2. Data Link — frame formation, media access control, error detection.
3. Network — routing, logical addressing (e.g., IP).
4. Transport — reliable data delivery, flow control (TCP, UDP).
5. Session — establishing, managing, and terminating communication sessions.
6. Presentation — data transformation, encoding, encryption.
7. Application — interface for applications, high-level protocols (HTTP, FTP).

Experience with Go and C/C++ is often related to network programming, for example, using libraries for working with pcap (packet capture), Suricata (IDS/IPS), DPI (deep packet inspection), Wireshark (traffic analysis), Zeek (network event recognition).

Local and private IP addresses are addresses that are not routable on the internet, used within local networks:

• Loopback (local): 127.0.0.1 (IPv4), ::1 (IPv6) — addresses for referring to oneself.
• Private IPv4 addresses:
  • 10.0.0.0 – 10.255.255.255
  • 172.16.0.0 – 172.31.255.255
  • 192.168.0.0 – 192.168.255.255

Example of a local address: 192.168.1.10 — often used in home networks.