Businesses rely on their data networks to efficiently serve customers and increase revenues. Network connectivity is extended to the homes of teleworkers and the offices of business partners through remote access and extranet VPNs. Consultants and contractors gain access to corporate network resources through the same LAN and WAN connections as regular employees. The threat of network service disruption by unauthorized sources grows as network reliability and security become more critical. Cisco IOS Software now offers network access control at the media access level (layer 2) through implementation of the 802.1x protocol.
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