300-415 Question #288: Real Exam Question with Answer & Explanation

Question

Options

• ASequence Rule 1: Match Conditions (Originator: 10.2.2.2, Color List: MPLS), Actions (Accept, Preference: 555). Sequence Rule 2: Match Conditions (Originator: 10.2.2.2, Color List: Public_Internet), Actions (Accept, Preference: 333).
• BSequence Rule 1: Match Conditions (Originator: 0.0.0.0, Color List: MPLS), Actions (Accept, Preference: 555). Sequence Rule 2: Match Conditions (Originator: 0.0.0.0, Color List: Public_Internet), Actions (Accept, Preference: 333).
• CSequence Rule 1: Match Conditions (Originator: 0.0.0.0, Color List: MPLS), Actions (Accept, Preference: 555). Sequence Rule 2: Match Conditions (Originator: 0.0.0.0, Color List: Public_Internet), Actions (Accept, Preference: 333).
• DSequence Rule 1: Match Conditions (Originator: 10.10.10.10, Color List: MPLS), Actions (Accept, Preference: 555). Sequence Rule 2: Match Conditions (Originator: 10.10.10.10, Color List: Public_Internet), Actions (Accept, Preference: 333).

Explanation

To form underlay connectivity, the configuration defines sequence rules to accept TLOCs from any originator for specific transport colors (MPLS and Public_Internet) and assigns different preferences to prioritize MPLS over Public_Internet.

Common mistakes.

• A. Matching a specific Originator: 10.2.2.2 would only form tunnels with that particular TLOC, which is too restrictive for generally forming underlay connectivity across the network's various sites and transports.
• C. This option is identical to option B and correctly implements the underlay connectivity. Assuming distinct options are intended, B is the designated correct choice.
• D. Matching a specific Originator: 10.10.10.10 would limit tunnel formation to only that TLOC, which is not suitable for establishing broad underlay connectivity across multiple sites and transports.

Concept tested. Cisco SD-WAN TLOC policies and preferences

Reference. https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/policy-book/sdwan-policy-book_chapter_011.html

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