Google Cloud Professional Cloud Network Engineer — Question 183

Your organization wants to set up hybrid connectivity with VLAN attachments that terminate in a single Cloud Router with 99.9% uptime. You need to create a network design for your on-premises router that meets those requirements and has an active/passive configuration that uses only one VLAN attachment at a time. What should you do?

Answer options

• A. Create a design that uses the LOCAL_PREF BGP attribute to influence the egress path from Google Cloud to the on-premises environment.
• B. Create a design that uses an equal-cost multipath (ECMP) with flow-based hashing on your on-premises devices.
• C. Create a design that uses a BGP multi-exit discriminator (MED) attribute to influence the egress path from Google Cloud to the on-premises environment.
• D. Create a design that uses the AS_PATH BGP attribute to influence the egress path from Google Cloud to the on-premises environment.

Correct answer: C

Explanation

The correct answer is C because using a BGP multi-exit discriminator (MED) allows you to influence the routing decisions for outbound traffic from Google Cloud to your on-premises environment, which is crucial for maintaining a reliable connection in an active/passive configuration. The other options either do not specifically cater to the requirements of a single VLAN attachment at a time (like A and B) or are not suitable for this scenario (like D).