DMVPN vs IPsec VPN: High Availability and Failover

350-701 By islever Editorial Last updated

Describe site-to-site and remote access VPN deployment types such as virtual tunnel interfaces, standards-based IPsec, SSL VPN, DMVPN, FlexVPN, and GETVPN

Short answer

A DMVPN supports high availability routing via dynamic neighbor discovery, and IPsec VPN supports stateless failover using protocols like HSRP.

Question

How do the features of DMVPN compare to IPsec VPN?
  1. DMVPN supports high availability routing, and IPsec VPN supports stateless failover. Correct Answer
  2. DMVPN uses hub-and-spoke topology, and IPsec VPN uses on-demand spoke topology.
  3. DMVPN supports non-IP protocols, and IPsec VPN only supports IP protocols.
  4. DMVPN supports multiple vendors, and IPsec VPN only supports Cisco products.

Key Takeaways

The key distinction lies in how each technology handles network resilience: DMVPN integrates with dynamic routing protocols for hub redundancy, while standard IPsec tunnels can be protected by stateful or stateless failover mechanisms like HSRP.

This question explores the architectural differences between DMVPN and standard IPsec VPNs, specifically focusing on their capabilities regarding routing redundancy and failover mechanisms in enterprise networks.

Common mistake: Many learners select Option B, assuming IPsec is inherently static and cannot support spoke-to-spoke or on-demand topologies, ignoring that IPsec is a protocol that can be deployed in various topologies including mesh or hub-and-spoke with dynamic routing.

Expert Analysis

Why the Answer Is Correct

Option A is correct because it accurately describes the operational strengths of both technologies in a high-availability context. DMVPN (Dynamic Multipoint VPN) is designed to work seamlessly with dynamic routing protocols (like OSPF or EIGRP), allowing multiple routers at the hub site to maintain adjacency and provide high availability if one hub router fails. Meanwhile, standard IPsec VPNs, when deployed on Cisco ISR routers, can leverage Layer 3 redundancy protocols like HSRP (Hot Standby Router Protocol) to achieve stateless failover, ensuring that traffic continues to flow even if the active interface or router component fails.

Why the Other Options Are Wrong

Option B is incorrect because IPsec VPNs are not limited to a single topology; they can be configured for point-to-point, site-to-site, or even hub-and-spoke models, and 'on-demand' is a feature often associated with DMVPN or FlexVPN but not exclusive to IPsec's inability to support spokes. Option C is false because while IPsec natively encapsulates IP packets, DMVPN does not exclusively support non-IP protocols in a way that defines its comparison; both primarily handle IP traffic. Option D is incorrect because IPsec is an industry-standard protocol (RFC 4301, etc.) supported by virtually all network vendors, whereas DMVPN is a Cisco proprietary implementation.

Community Comment Notes

Community consensus strongly favors Option A, with users noting that DMVPN allows for hub redundancy via dynamic routing (e.g., BGP/OSPF) and that IPsec supports failover through mechanisms like HSRP. One user asked why C was incorrect, highlighting confusion about protocol support, while others pointed out that IPsec is widely multi-vendor compatible, disproving D.

Official Reference

https://www.cisco.com/c/en/us/products/collateral/security/dynamic-multipoint-vpn-dmvpn/data_sheet_c78-468520.html

This link opens the official vendor documentation in a new tab.

Exam Strategy

When comparing VPN technologies, focus on their deployment flexibility and integration with existing infrastructure (like routing protocols). Remember that 'proprietary' features usually offer specific efficiencies, while 'standard' protocols offer broad compatibility.

Frequently Asked Questions

Does IPsec support spoke-to-spoke communication?

Standard IPsec site-to-site typically requires full-mesh configurations for spoke-to-spoke, whereas DMVPN enables dynamic spoke-to-spoke tunnels without pre-configuring every pair.

Is DMVPN only available on Cisco devices?

Yes, DMVPN is a Cisco proprietary technology. Standard IPsec is an open standard supported by most network vendors.

More 350-701 FAQ →

Community Votes

A
100%

100% of anonymous learners picked answer A. Votes are pick records left by other test-takers — they are not the verified answer.

Discussion 6 contributions

Compiled from public community threads and reader submissions, lightly edited for clarity. Handles and vote tallies are shown as recorded, and comments reflect the views of individual contributors.

From public community threads 6

  1. houhou12322 👍 2
    https://www.cisco.com/c/en/us/products/collateral/security/dynamic-multipoint-vpn-dmvpn/data_sheet_c78-468520.html https://www.cisco.com/c/en/us/td/docs/interfaces_modules/shared_port_adapters/configuration/6500series/sipspasw/76cfvpn6.html#wp2016394
  2. luismg 👍 1 Answered A
    You can have DMVPN with BGP with two routers in the HUB, that will create HA in routing. Also IPSEC VPN supports stateless failover if you have HSRP in the ISR routers and one dies. A for me.
  3. devildog 👍 1 Answered A
    At first glance, B. seems accurate. However, I cannot find documentation to support that IPSEC VPN tunnels "on-demand spoke technology"
  4. Demon_Queen_Velverosa 👍 1 Answered A
    The answer is A as we setup IPsec tunnels at my castle
  5. Arian5431 👍 1
    can someone explain why C not a correct answer?
Show 1 more comment
  1. klu16 👍 1 Answered A
    A for me.

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