CCNP Quick Reference Sheets Bundle: Exams 642-901, 642-812, 642-845, 642-825

Chapter 4. IPsec

• IPsec Headers 28

• Authentication Methods 29

• Encryption Methods 29

• Key Management 30

• Establishing an IPsec VPN 31

• Configuring a Site-to-Site VPN Using Cisco IOS Commands 31

• Configuring an IPsec Transform Set 32

• Configuring a Site-to-Site VPN Using SDM 34

• Monitoring and Troubleshooting IPsec VPNs 35

• Using GRE with IPsec 35

• Configuring a GRE Tunnel Using Cisco IOS Commands 36

• High-Availability VPNs 37

• Cisco Easy VPN 39

• Configuring the Cisco VPN Client 41

IP Security, or IPsec, is a set of rules for securing data communications across a public, untrusted network such as the Internet. It provides the following:

• Data confidentiality by encrypting portions of a packet

• Data integrity by ensuring the packet has not been altered in transit

• Data source authentication ...