From the course: Cisco CCNA (200-301) Cert Prep: 3 Security, Automation, and Programmability

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VPNs

VPNs

From the course: Cisco CCNA (200-301) Cert Prep: 3 Security, Automation, and Programmability

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VPNs

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- [Instructor] Virtual private networks extend private networks across an untrusted network. Usually this untrusted network is the Internet. This can be used for secure communications between offices that share files, voice traffic, or, really, anything that can be transported over TCPIP. VPNs provide anti-replay, which prevents man-in-the-middle attacks. Data integrity, which ensures packets aren't manipulated in transit. Confidentiality, which means no one can eavesdrop on communications. And authentication, which proves that either endpoint is who they say they are. I'll use the Internet for this example. Our remote office will create a secure tunnel between itself and the central office. When doing so, the two routers will create what's called a VPN tunnel. The word tunnel is quite fitting, as once it's established, everything that moves through it will be protected, even over the Internet. The term tunnel doesn't necessarily imply that all traffic moving through it is encrypted…

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