Which type of VPN allows multicast and broadcast traffic over a secure site-to-site VPN?

Last Updated: May 9, 2026
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Question:
Which type of VPN allows multicast and broadcast traffic over a secure site-to-site VPN?

  • dynamic multipoint VPN
  • SSL VPN
  • IPsec virtual tunnel interface
  • GRE over IPsec

Explanation: Generic Routing Encapsulation (GRE) is a tunneling protocol that supports both multicast and broadcast traffic, which is essential for the operation of routing protocols over a VPN. Because standard IPsec tunnels are limited to unicast traffic, GRE over IPsec is used to encapsulate these non-unicast frames into GRE packets, which are then securely encrypted by IPsec for transport across the public network.

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