The answer is that Cloud Router supports multiple BGP sessions per router and can use a private ASN from the range 64512-65534. These two features are correct because Cloud Router is designed to manage complex hybrid connectivity, allowing a single router to establish multiple BGP sessions with different on-premises peers, which is essential for redundancy and load balancing. Additionally, using a private ASN avoids the need to register a public ASN, making it ideal for organizations connecting internal networks via VPN or Dedicated Interconnect. On the Google Professional Cloud Network Engineer exam, this topic tests your understanding of BGP configuration flexibility in Google Cloud, often appearing in scenario-based questions where you must choose the correct peering attributes. A common trap is assuming Cloud Router requires a public ASN or supports only one session per router. Remember the mnemonic “Private Peers, Multiple Meetings” to recall that Cloud Router uses private ASNs and supports multiple BGP sessions.
PCNE Implementing hybrid interconnectivity Practice Question
This PCNE practice question tests your understanding of implementing hybrid interconnectivity. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which TWO statements about Cloud Router BGP are correct? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Cloud Router can use a private ASN.
Option B is correct because Cloud Router can use a private ASN (64512-65534) for BGP peering, which is common when connecting to on-premises networks that do not require a public ASN. This allows flexibility in hybrid interconnectivity without needing to register a public ASN.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Cloud Router uses multi-hop eBGP by default.
Why it's wrong here
Single-hop eBGP is default; multi-hop is configurable.
✓
Cloud Router can use a private ASN.
Why this is correct
Private ASN is commonly used.
Related concept
Read the scenario before looking for a memorised answer.
✗
Cloud Router requires a public ASN.
Why it's wrong here
Private ASNs are permitted.
✓
Cloud Router supports multiple BGP sessions per router.
Why this is correct
Multiple peers are supported.
Related concept
Read the scenario before looking for a memorised answer.
✗
Cloud Router only supports MED for routes it sends to on-premises.
Why it's wrong here
MED is supported in both directions.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that Cloud Router requires a public ASN or that it uses multi-hop eBGP by default, when in fact private ASNs are supported and single-hop eBGP is the default behavior.
Detailed technical explanation
How to think about this question
Cloud Router implements BGP-4 (RFC 4271) and supports both eBGP and iBGP sessions. When using private ASNs, the ASN is automatically stripped from the AS_PATH when routes are advertised to Google's public network, ensuring proper route propagation. In real-world scenarios, private ASNs are often used in VPN interconnects to avoid conflicts with public ASNs, and MED can be set on routes received from on-premises to influence return traffic paths.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Implementing hybrid interconnectivity — This question tests Implementing hybrid interconnectivity — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Cloud Router can use a private ASN. — Option B is correct because Cloud Router can use a private ASN (64512-65534) for BGP peering, which is common when connecting to on-premises networks that do not require a public ASN. This allows flexibility in hybrid interconnectivity without needing to register a public ASN.
What should I do if I get this PCNE question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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