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300-415 · Question #238

An engineer modifies a data policy for DIA in VPN 67. The location has two Internet-bound circuits. Only the web browsing traffic must be admitted for DIA, without further discrimination about which…

The correct answer is A. sequence 5 match destination-port 80 443 destination-ip 0.0.0.0/0 ! action accept nat use-vpn 0. To permit only web browsing traffic for Direct Internet Access (DIA) in VPN 67 without transport discrimination, a data policy must be configured with a lower sequence number to match destination ports 80 and 443 to any destination IP, then accept and direct the traffic to the…

Policies

Question

An engineer modifies a data policy for DIA in VPN 67. The location has two Internet-bound circuits. Only the web browsing traffic must be admitted for DIA, without further discrimination about which transport to use. Here is the existing data policy configuration: data-policy DIA vpn-list VPN-67 sequence 10 match destination-data-prefix-list INTERNAL-NETWORKS ! default-action drop Which policy configuration sequence meets the requirements?

Exhibit

300-415 question #238 exhibit

Options

  • Asequence 5 match destination-port 80 443 destination-ip 0.0.0.0/0 ! action accept nat use-vpn 0
  • Bsequence 20 match destination-port 80 443 source-ip 0.0.0.0/0 ! action accept set local-tloc-list color biz-internet
  • Csequence 20 match destination-port 80 443 destination-ip 0.0.0.0/0 ! action accept nat use-vpn 0
  • Dsequence 5 match destination-port 80 443 source-ip 0.0.0.0/0 ! action accept set local-tloc-list color biz-internet

How the community answered

(47 responses)
  • A
    81% (38)
  • B
    11% (5)
  • C
    6% (3)
  • D
    2% (1)

Why each option

To permit only web browsing traffic for Direct Internet Access (DIA) in VPN 67 without transport discrimination, a data policy must be configured with a lower sequence number to match destination ports 80 and 443 to any destination IP, then accept and direct the traffic to the internet via 'nat use-vpn 0'.

Asequence 5 match destination-port 80 443 destination-ip 0.0.0.0/0 ! action accept nat use-vpn 0Correct

This configuration correctly matches web browsing traffic by specifying 'destination-port 80 443' and 'destination-ip 0.0.0.0/0', allowing it to reach any internet destination. The 'action accept nat use-vpn 0' permits this traffic and directs it through VPN 0 for Direct Internet Access (DIA). Crucially, 'sequence 5' ensures this rule is evaluated before the existing 'sequence 10' and 'default-action drop', guaranteeing the traffic is admitted.

Bsequence 20 match destination-port 80 443 source-ip 0.0.0.0/0 ! action accept set local-tloc-list color biz-internet

This option incorrectly uses 'source-ip 0.0.0.0/0' instead of destination IP for internet-bound traffic, and 'set local-tloc-list color biz-internet' explicitly selects a transport, contradicting the requirement of 'without further discrimination about which transport to use'. Additionally, sequence 20 would be after the default drop.

Csequence 20 match destination-port 80 443 destination-ip 0.0.0.0/0 ! action accept nat use-vpn 0

While the match and action are largely correct, 'sequence 20' is too high. This rule would be evaluated after the 'default-action drop' in the existing policy, causing the web browsing traffic to be dropped before this sequence is reached.

Dsequence 5 match destination-port 80 443 source-ip 0.0.0.0/0 ! action accept set local-tloc-list color biz-internet

This option incorrectly uses 'source-ip 0.0.0.0/0' and explicitly sets a TLOC, which goes against the requirement of not discriminating about which transport to use.

Concept tested: SD-WAN data policy for DIA with sequence order

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

Topics

#SD-WAN Data Policy#Direct Internet Access (DIA)#Policy Sequencing#NAT use-vpn 0

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