IPsec (IP Security) is a framework of protocols that protects IP traffic with confidentiality (encryption), integrity (a hash-based message authentication code), authentication of the peers and anti-replay protection. It is used for site-to-site VPNs between routers and firewalls and for remote access. ENCOR focuses on how the tunnel is negotiated, how packets are encapsulated and the two main ways to configure it on Cisco IOS.
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