Granular Control: Security Lists offer specific inbound and outbound traffic filtering rules based on source IP addresses, destination IP addresses, ports, and protocols. This allows you to precisely control which resources within your VCN can be accessed from your on-premises network via the VPN tunnel.
Direct Enforcement: Security List rules are applied directly at the VCN level, ensuring granular control over traffic flow before it reaches specific resources within the VCN.
Flexibility: You can create multiple Security Lists with different rules to apply to different subnets or resources within your VCN, providing flexible access control based on your specific needs.
Integration with VPN: Security Lists work seamlessly with Site-to-Site VPN connections, allowing you to leverage granular access control alongside the secure tunnel established by the VPN.
Other options might contribute to security, but they don,t directly address fine-grained control through the VPN connection:
B). Service Gateway with access control lists (ACLs): Service Gateway primarily manages outbound internet traffic within a VCN, not specifically controlling access through VPN connections.C. Dynamic Routing Gateway (DRG) route tables: DRG route tables control overall routing between VCNs and attached networks, not granular access control within a specific VCN.D. Site-to-Site VPN with advanced encryption options: While encryption protects data transmission, it doesn,t provide the level of granular access control offered by Security Lists within the VCN.