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300-415 · Question #295

An engineer creates this data policy for DIA for VPN 10: data-policy DIA vpn-list VPN-10 sequence 10 match destination-data-prefix-list INTERNAL-NETWORKS ! action accept Which policy sequence…

The correct answer is C. sequence 5 match source-ip 0.0.0.0/0 ! action accept nat use-vpn 0. To enable Direct Internet Access (DIA) for external networks in VPN 10, a data policy sequence is required that matches all source IP traffic from the VPN and directs it to the transport VPN 0 for NATing.

Policies

Question

An engineer creates this data policy for DIA for VPN 10: data-policy DIA vpn-list VPN-10 sequence 10 match destination-data-prefix-list INTERNAL-NETWORKS ! action accept Which policy sequence enables DIA for external networks?

Options

  • Asequence 5 match destination-ip 0.0.0.0/0 ! action reject ! default-action accept
  • Bsequence 20 match source-ip 0.0.0.0/0 ! action reject ! default-action accept
  • Csequence 5 match source-ip 0.0.0.0/0 ! action accept nat use-vpn 0
  • Dsequence 20 match destination-ip 0.0.0.0/0 ! action accept nat use-vpn 0

How the community answered

(22 responses)
  • A
    5% (1)
  • C
    82% (18)
  • D
    14% (3)

Why each option

To enable Direct Internet Access (DIA) for external networks in VPN 10, a data policy sequence is required that matches all source IP traffic from the VPN and directs it to the transport VPN 0 for NATing.

Asequence 5 match destination-ip 0.0.0.0/0 ! action reject ! default-action accept

The `action reject` command in this sequence would block traffic, preventing Direct Internet Access rather than enabling it.

Bsequence 20 match source-ip 0.0.0.0/0 ! action reject ! default-action accept

Similar to option A, the `action reject` command would prevent traffic from being forwarded, thus failing to enable Direct Internet Access.

Csequence 5 match source-ip 0.0.0.0/0 ! action accept nat use-vpn 0Correct

This sequence, placed at a higher priority (sequence 5), matches all outgoing traffic from VPN 10 using `source-ip 0.0.0.0/0`. The `action accept nat use-vpn 0` then explicitly instructs the device to accept this traffic and perform Network Address Translation (NAT) using VPN 0, which is the dedicated transport VPN for internet breakout, thereby enabling DIA for all traffic, including external networks.

Dsequence 20 match destination-ip 0.0.0.0/0 ! action accept nat use-vpn 0

While this sequence uses the correct `action accept nat use-vpn 0` for DIA and targets `destination-ip 0.0.0.0/0`, placing it at `sequence 20` would cause it to be evaluated after `sequence 10`. The correct answer C is typically considered a broader DIA policy by matching all source traffic at a higher priority.

Concept tested: SD-WAN Data Policy, Direct Internet Access (DIA) configuration

Source: https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/sdwan-xe-gs-book/sdwan-policy-config.html

Topics

#SD-WAN Data Policy#Direct Internet Access (DIA)#NAT#Policy Sequencing

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