Cisco 350-701: Which topology supported when crypto ACLs are used

Question

When a site-to-site VPN is configured in Cisco FMC, which topology is supported when crypto ACLs are used instead of protected networks to define interesting traffic?

A. hub-and-spoke
B. full mesh
C. DMVPN
D. point-to-point

Answer

D. point-to-point

Explanation

The correct answer is D. point-to-point.

A site-to-site VPN is configured in Cisco FMC by creating a VPN topology that defines the endpoints, IKE parameters, IPsec parameters, and protected networks of the VPN tunnel. Protected networks are the subnets that are encrypted and decrypted by the VPN tunnel. However, in some cases, you may want to use crypto ACLs instead of protected networks to define the interesting traffic for the VPN tunnel. Crypto ACLs are access control lists that match the source and destination addresses of the traffic that should be protected by the VPN tunnel.

When you use crypto ACLs instead of protected networks, you can only configure a point-to-point topology for the site-to-site VPN. A point-to-point topology establishes a VPN tunnel between two endpoints. You cannot use crypto ACLs for hub-and-spoke, full mesh, or DMVPN topologies, because these topologies require multiple endpoints and protected networks.

The other options are incorrect because:

• A. hub-and-spoke. This topology establishes a group of VPN tunnels connecting a hub endpoint to a group of spoke nodes. You cannot use crypto ACLs for this topology, because you need to specify the protected networks for each spoke node.
• B. full mesh. This topology establishes a group of VPN tunnels among a set of endpoints. You cannot use crypto ACLs for this topology, because you need to specify the protected networks for each endpoint.
• C. DMVPN. This is a dynamic multipoint VPN that allows multiple sites to communicate directly with each other over a shared network without requiring a permanent VPN tunnel between them. You cannot use crypto ACLs for this topology, because you need to specify the protected networks for each site.

Reference

• Site to Site VPN Configuration on FTD Managed by FMC – Cisco
• Firepower Management Center Configuration Guide, Version 7.0 – Site-to-Site VPNs for Firepower Threat Defense [Cisco Secure Firewall Management Center] – Cisco
• Configure Route Based Site to Site VPN Tunnel on FTD Managed by FMC – Cisco

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