Google Exam Professional Cloud Network Engineer Topic 4 Question 71 Discussion

Actual exam question for Google's Professional Cloud Network Engineer exam

Question #: 71
Topic #: 4

[All Professional Cloud Network Engineer Questions]

You have the networking configuration shown in the diagram. A pair of redundant Dedicated Interconnect connections (int-Igal and int-Iga2) terminate on the same Cloud Router The Interconnect connections terminate on two separate on-premises routers. You are advertising the same prefixes from the Border Gateway Protocol (BGP) sessions associated with the Dedicated Interconnect connections. You need to configure one connection as Active for both ingress and egress traffic. If the active Interconnect connection fails, you want the passive Interconnect connection to automatically begin routing all traffic Which two actions should you take to meet this requirement? (Choose Two)

AConfigure the advertised route priority > 10,200 on the active Interconnect connection.

BAdvertise a lower MED on the passive Interconnect connection from the on-premises router

CConfigure the advertised route priority as 200 for the BGP session associated Wlth the active Interconnect connection.

DConfigure the advertised route priority as 200 for the BGP session associated With the passive Interconnect connection.

EAdvertise a lower MED on the active Interconnect connection from the on-premises router

Show Suggested Answer

Suggested Answer: C, E

This answer meets the requirement of configuring one connection as Active for both ingress and egress traffic, and enabling automatic failover to the passive connection in case of failure. The reason is:

The advertised route priority is a value that Cloud Router uses to set the route priority when advertising routes to your on-premises router.The lower the value, the higher the priority1.By setting the advertised route priority as 200 for the active connection, you ensure that it has a higher priority than the passive connection, which has the default value of 1001. This way, your on-premises router will prefer the routes from the active connection over the passive one for ingress traffic.

The MED (Multi-Exit Discriminator) is a value that your on-premises router uses to indicate its preference for receiving traffic from Cloud Router.The lower the value, the higher the preference2. By advertising a lower MED on the active connection from your on-premises router, you ensure that Cloud Router will prefer sending traffic to the active connection over the passive one for egress traffic.

If the active connection fails, Cloud Router will stop receiving routes from it and will start using the routes from the passive connection for egress traffic. Similarly, your on-premises router will stop receiving routes with priority 200 from the active connection and will start using the routes with priority 100 from the passive connection for ingress traffic. This achieves automatic failover without any manual intervention.

Option A is incorrect because setting the advertised route priority > 10,200 on the active connection would deprioritize it globally in your VPC network, which is not what you want1.Option B is incorrect because advertising a lower MED on the passive connection would make Cloud Router prefer sending traffic to it over the active one, which is not what you want2.Option D is incorrect because setting the advertised route priority as 200 for both connections would make them equally preferred by your on-premises router, which is not what you want1.

Update the base route priority | Cloud Router | Google Cloud

Configuring BGP sessions | Cloud Router | Google Cloud

by Galen at Oct 17, 2023, 12:56 PM

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