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Ipv4 and ipv6 security provides at the network ip

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IPv4 and IPv6 Security Provides encryption/authentication at the network (IP) layer IPSec applications: Virtual Private Networking E-commerce
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The Scope of IPSec Authentication Header (AH) provides authentication only Encapsulation Security Payload (ESP) provides encryption and authentication Key exchange function
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Security Association One-way relationship between two hosts, providing security services for the payload Uniquely identified by: Security Parameter Index (SPI) IP destination address Security Protocol Identifier (AH/ESP)
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IPSec Operation Modes Transport mode: provides protection to the upper layers ESP: encrypts the payload and, optionally, authenticates parts of the IP header AH: authenticates the payload and parts of the IP header
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IPSec Operation Modes Tunnel mode: used when one/both of the ends is a security gateway the entire IP packet is encrypted (ESP) / authenticated (AH) and encapsulated in an outer IP packet
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Key Management Manual used for small networks easier to configure Automated more scalable more difficult to setup ISAKMP/Oakley
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IPv4 and IPv6 Security Provides at the network IP

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