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…
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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)- A81% (38)
- B11% (5)
- C6% (3)
- D2% (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'.
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.
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.
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.
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
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