OPNVPN supports transport layers at least which option?

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Multiple Choice

OPNVPN supports transport layers at least which option?

Explanation:
OPNVPN in RouterOS supports two ways to carry the VPN traffic: Layer 2 bridging (using TAP) and Layer 3 routing (using TUN). Layer 2 lets connected clients appear in the same Ethernet broadcast domain, preserving ARP and other L2 features. Layer 3 routes IP traffic between subnets, isolating them and treating the VPN as a routed link. Because OPNVPN can operate in either mode, it supports transport at Layer 2 or Layer 3, not just one single layer. The option that states Layer 2 or Layer 3 is the best fit. (Layer 4 would refer to the tunnel’s underlying transport like UDP/TCP, which is not what this question is asking about.)

OPNVPN in RouterOS supports two ways to carry the VPN traffic: Layer 2 bridging (using TAP) and Layer 3 routing (using TUN). Layer 2 lets connected clients appear in the same Ethernet broadcast domain, preserving ARP and other L2 features. Layer 3 routes IP traffic between subnets, isolating them and treating the VPN as a routed link. Because OPNVPN can operate in either mode, it supports transport at Layer 2 or Layer 3, not just one single layer. The option that states Layer 2 or Layer 3 is the best fit. (Layer 4 would refer to the tunnel’s underlying transport like UDP/TCP, which is not what this question is asking about.)

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