PCNE Configuring Network Services Practice Question
A company is designing a hybrid network using Dedicated Interconnect. They want to configure BGP for load balancing across multiple VLAN attachments. Which TWO statements are correct?
⚠ Common exam trap
Google Cloud often tests the misconception that BGP MED controls outbound traffic, but in reality, MED is a hint for inbound path selection, while outbound load balancing relies on equal BGP attributes and ECMP.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
You can configure the Cloud Router to advertise the same IP prefixes over both VLAN attachments.
A Cloud Router can advertise the same IP prefixes over multiple VLAN attachments to enable load balancing. This allows Google Cloud to use ECMP (Equal-Cost Multi-Path) routing to distribute outbound traffic across the two VLAN attachments, as long as the BGP attributes (e.g., AS path length, MED) are equal.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
You must create a separate Cloud Router for each VLAN attachment.
Why it's wrong here
A single Cloud Router can manage multiple VLAN attachments.
- ✓
You can configure the Cloud Router to advertise the same IP prefixes over both VLAN attachments.
Why this is correct
Advertising the same prefixes over multiple VLANs enables load balancing.
- ✗
You should use BGP MED to load balance outbound traffic from Google Cloud.
Why it's wrong here
MED influences inbound traffic; for outbound, you use AS path prepending or weight.
- ✓
You can use the same BGP ASN for both VLAN attachments.
Why this is correct
It is common to use the same ASN for multiple BGP sessions on the same Cloud Router.
- ✗
Load balancing across VLAN attachments requires a single BGP session.
Why it's wrong here
Load balancing requires multiple BGP sessions, one per VLAN attachment.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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