Cisco routers are said to have a market share of over 90% in the Internet. They are used widely by most large companies and agencies all over the world, and are considered as the most important building blocks of the Internet. But, Cisco routers have several vulnerabilities that could allow hackers to disrupt Internet traffic, intercept sensitive information such as passwords and credit card numbers or redirect traffic from web sites. Securing the router is the first thing that network administrators need to do.
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