IT network design is the process of designing and implementing computer networks, which includes needs analysis, planning, component selection, installation and configuration. The goal is to create a reliable and efficient network infrastructure that meets specific customer requirements and enables seamless operation of IT systems.

Key aspects of IT network design:

Needs and requirements analysis:
Includes identifying performance, security, availability, scalability, and other customer-specific needs.

Network Architecture Design:
Determination of network topology (star, bus, ring, etc.), selection of network elements (routers, switches, servers, etc.), and determination of communication protocols.

Cabling Planning:
Selection of appropriate type of cabling (metallic, fiber optic) and design of cabling route for structured cabling.

Design and configuration of active elements:
Configuration of routers, switches, wireless access points and other active elements for optimal network operation.

Security aspects:
Implementation of security measures such as firewalls, antivirus protection, VPN and others to protect the network from unauthorized access and cyber attacks.  

Testing and Optimization:
Testing the network after installation and optimizing the configuration for optimal performance and reliability. 

Documentation:
Creating detailed network documentation, including network topology.