Cisco

Cisco is an American company and one of the world's largest manufacturers of networking hardware and software. Cisco solutions — routers, switches, firewalls and access points — form the physical backbone over which data travels in corporate networks, at internet service providers and inside data centers. In the industry, the brand name has become almost synonymous with professional networking infrastructure.

The role Cisco plays

Cisco's portfolio covers devices operating at successive layers of the network. Routers direct packets between different networks and decide the path data takes. Switches connect devices within a local network and manage traffic at the frame level. Firewalls and intrusion detection systems filter traffic for threats, acting as an advanced firewall.

These devices are managed through Cisco's own operating system, IOS, and the command-line interface known as CLI. Cisco also develops software solutions: software-defined networking (SDN) controllers, security platforms and cloud services, so the brand today reaches well beyond hardware alone.

Practical applications

You will find Cisco equipment mainly in environments with high reliability and throughput requirements.

• Data centers — Cisco switches and routers handle traffic between hundreds of servers while maintaining high availability.
• Enterprise networks — connecting company branches, running VPN tunnels and segmenting traffic for security.
• Internet providers — Cisco edge routers direct enormous volumes of data between networks.

For IT professionals, knowing how to configure Cisco devices is a valuable skill, validated by the popular CCNA and CCNP certifications. In modern infrastructure, Cisco solutions often work alongside load balancing and network virtualization.