Dynamically Routed VPN Connections

Answer - D.

The AWS Documentation mentions the following.

Dynamically routed VPN connections use the Border Gateway Protocol (BGP) to exchange routing information between your customer gateways and the virtual private gateways.

Statically routed VPN connections require you to enter static routes for the network on your side of the customer gateway.

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The correct answer is D. BGP.

Virtual Private Network ( VPN) allows secure communication between two private networks over the public internet. There are two types of VPNs: Site-to-Site VPN and Remote Access VPN. In the Site-to-Site VPN, two or more sites are connected together using a VPN gateway, while in Remote Access VPN, a client connects to a VPN gateway.

There are two types of VPN connections: Static and Dynamic. In the Static VPN connection, a fixed route is configured between the VPN gateway and the customer gateway. This is suitable for small networks with a limited number of hosts. However, for large networks with multiple subnets and hosts, it is not practical to configure a static route for each host.

In the Dynamic VPN connection, routing information is dynamically exchanged between the VPN gateway and the customer gateway using a routing protocol such as BGP (Border Gateway Protocol), OSPF (Open Shortest Path First), or RIP (Routing Information Protocol). BGP is the most commonly used routing protocol for the dynamic VPN connection in AWS. BGP is a robust and scalable protocol that allows the exchange of routing information between different Autonomous Systems (ASes). It supports multiple paths, load balancing, and redundancy.

TCP (Transmission Control Protocol) is a connection-oriented protocol that provides reliable, ordered, and error-checked delivery of data between applications. It is commonly used for web browsing, email, and file transfer.

UDP (User Datagram Protocol) is a connectionless protocol that provides unreliable, unordered, and unacknowledged delivery of data between applications. It is commonly used for real-time applications such as video conferencing, online gaming, and VoIP.

ICMP (Internet Control Message Protocol) is a protocol used by network devices to send error messages and operational information about network conditions.

In conclusion, the correct protocol for dynamically routed VPN connections is BGP, as it is a robust and scalable routing protocol that allows the exchange of routing information between different networks.