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cisco mpls book pdf.AES 256: 256 bits in length. The following shows the hash algorithms that are typically used when deploying IPSec.SecureHashAlgorithm (SHA) oMessage Digest Algorithm 5 (MD5) o Common authentication methods for IPSec are pre-shared keys (IPSec peers use shared keys to perform authentication with each other) anddigital certificates in conjunction with a public key infrastructure (PKI).While SMBs typically use pre-shared keys as the authentication mechanism for IPSecVPN, many large enterprises use digital certificates as the authentication mechanism for IPSec VPN for scalability, centralized management, and various other security mechanisms.The IKE phase ISA can be established in mainmode or aggressivemode. In active mode, only three packets need to be exchanged to complete the SA negotiation. The master mode also provides identity protection if pre-shared keys are enabled. Active mode can provide identity protection only when digital certificate authentication is enabled.Note: Cisco products that support IPSec features typically establish site-to-site VPN tunnels in primary mode and remote access VPN tunnels in active mode. This is the default behavior when using pre-shared keys as the authentication method.Exchange ID and verify HASH . ------------------------------> Note: These two packets are encrypted HDR*, IDi, HASHi HDR*, IDR, HARSH RFigure 7-3 shows the six packets exchanged between IPSec peers when negotiating an ISAKMP SA in master mode.Originating party Responding party