Objective 4.3
PCNEConfiguring Cloud Router
Objective 4.3 sits in Configuring and implementing hybrid and multicloud network interconnectivity, which carries 16% of the Cloud Network Engineer exam. The questions below are original, written from the official objective title above, and each explanation cites the Google Cloud page it rests on.
Objective title verbatim from the official objectives. Google Cloud exam page ↗
A worked example
Shown solved, with the whole explanation open: this is what every question here carries.
An engineer adds a custom prefix to a Cloud Router and the on-premises router immediately loses the VPC subnet routes it had been receiving. What did that option do?
Correct.
Concept
An option phrased as adding something can be exclusive rather than additive, and choosing it silently withdraws everything it does not name.
Why B
Advertising only custom IPv4 and IPv6 prefixes sends just the ranges specified and omits subnet ranges, whereas a separate option adds custom prefixes alongside them.
Source
Cloud Router advertised routes, checked August 2026Advertise only custom IPv4 and IPv6 prefixes : this option advertises only the IP address ranges you specify, omitting subnet ranges. The advertised MED always matches the configured base priority of the BGP session.
Now you: objective 4.3 questions
No account needed. The explanation opens when you answer.
Sample question 1 of 3
A Cloud Router runs custom advertisement, and a team then sets custom advertisement on one of its BGP sessions as well. Which configuration applies on that session?
Sample question 2 of 3
A VPC network uses global dynamic routing and a team sets a base priority of 100 on a BGP session. What MED does a subnet range from another region carry?
Sample question 3 of 3
A team enables IPv6 on a dual-stack HA VPN and finds that the external IPv6 subnet range never reaches the peer. How can that range be advertised?
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Read the sources
These are the official pages the questions above cite. Reading them is studying the objective from the primary source, which is what the explanations point you toward anyway.