Rows of rack-mounted network switches and routers in a dim server room, blinking green and amber LEDs against dark metal chassis, cool blue ambient light

Networking Hardware & Cisco History

The story behind the multi-protocol router revolution, the rise of Cisco Systems, and practical guidance on building networks with second-hand equipment.

Success Story of Cisco, the Networking Equipment Leader

Cisco Systems was founded in September 1984 by Leonard Bosack and Sandy Lerner, two computer scientists at Stanford University. Their breakthrough was the multi-protocol router — a device that could connect disparate computer networks and translate between different networking protocols, solving a fundamental problem that had kept early networks isolated from one another.

The company rode the explosive growth of the internet through the 1990s. By early 2000, just before the dot-com bubble burst, Cisco's market capitalization exceeded $500 billion, briefly making it the most valuable company in the world. Its dominance was built on a relentless cycle of internal innovation and strategic acquisitions, absorbing dozens of companies to broaden its portfolio across switching, routing, security, and voice.

Cisco's early routers were born from the need to connect Stanford's own heterogeneous campus networks. The company commercialized technology originally developed at the university, and its first product — the AGS router — shipped in 1986. From those academic roots, Cisco grew into the backbone provider for the global internet.

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The Rise of Multi-Protocol Routers

Before multi-protocol routers, networks were fragmented. TCP/IP, DECnet, AppleTalk, and IBM's SNA each spoke different languages. Cisco's core insight was that a single intelligent device could bridge these worlds, translating packets between protocols and making heterogeneous enterprise networks practical. This capability, combined with the rapid adoption of Ethernet as a universal local-area standard, positioned Cisco at the centre of the networking revolution.

The company's marketing later captured this idea with the slogan "The Human Network", framing technology not just as infrastructure but as a connector of people and ideas.

Setting Up Networks with Second-Hand Equipment

Building a capable lab or small-office network doesn't require brand-new hardware. Used enterprise-grade switches and routers — often decommissioned during corporate upgrades — can deliver reliable performance at a fraction of the cost. Suppliers such as Aliter Networks specialize in refurbished networking gear, offering tested and warrantied equipment from Cisco and other manufacturers.

When sourcing used hardware, consider the following:

  • Verify firmware and licensing: Some enterprise features require active licenses that may not transfer with second-hand equipment.
  • Check port speeds and standards: Older Gigabit switches may lack PoE+ or 10GbE uplinks needed for modern deployments.
  • Assess power consumption and noise: Data-centre-class gear can be loud and power-hungry — factor this into your environment.
  • Buy from reputable resellers: Look for suppliers that test, grade, and warranty their inventory.

Key Milestones in Cisco's History

YearEvent
1984Founded by Leonard Bosack and Sandy Lerner at Stanford University
1986First product — the AGS router — shipped
1990IPO on NASDAQ; annual revenue approximately $69 million
2000Market capitalization exceeded $500 billion; most valuable company globally