# CCNA

*CCNA*

By [SPOKEN ENGLISH](https://paragraph.com/@httpswww.sevenmentor.comspoken-english-classes-in-kolhapur) · 2025-03-17

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CCNA certified professionals can install, configure, and operate

LAN, WAN, and dial access services for small networks (100 nodes or

fewer), including but not limited to use of these protocols: IP,

IGRP, Serial, Frame Relay, IP RIP, VLANs, RIP, Ethernet, Access

Lists. CCNA certifications are valid for three years. To recertify,

either pass the current CCNA exam, or pass the ICND exam, or pass

any 642 professional level or Cisco Qualified Specialist exam

(excluding Sales Specialist exams), or pass a CCIE written exam on

or after October 1, 2004.

In early 1980's, Len Sandy Bosack, a married couple who worked

in different computer departments at Standford University, were

having trouble getting their individual systems to communicate. So,

in their living room they created a gateway server that made it

easier for their disparate computers in two different departments

to communicate using the IP [protocols.In](http://protocols.In) 1984, they founded cisco

systems.

The first product the company marketed was called the Advanced

Gateway Server (AGS). later Mid-Range Gateway Server (MSG), the

Compact Gateway Server (CGS), the Integrated Gateway Server

(IGS)and the AGS+.

nterconnecting of Cisco

Networking Devices.

Exam: 640-821: Introduction to Cisco Networking

Technologies.

There are CCNP, CCIE, CCDA, CCDP, CCSP .

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