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Exam Professional Cloud Network Engineer All Questions

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Exam Professional Cloud Network Engineer topic 1 question 190 discussion

Actual exam question from Google's Professional Cloud Network Engineer
Question #: 190
Topic #: 1
[All Professional Cloud Network Engineer Questions]

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?

  • 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.
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Suggested Answer: C 🗳️
by b0b25 at Feb. 22, 2025, 3:05 a.m.

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mohitms1996
4 days ago
Selected Answer: C
You're absolutely right! Local Preference (LOCAL_PREF) is a BGP attribute used to influence egress traffic within the same Autonomous System (AS). It helps on-premises routers decide which path to use when sending traffic to Google Cloud. However, in the given scenario, we need to influence Google Cloud’s egress path to on-premises. Multi-Exit Discriminator (MED) is the preferred attribute for this because it influences the egress traffic from Google Cloud towards on-premises.
upvoted 1 times
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RKS_2021
1 week ago
Selected Answer: C
Changing answer to C
upvoted 1 times
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rich_maverick
1 week, 1 day ago
Selected Answer: A
A is correct. MED is a negotiated attribute between routers and is not guaranteed. Local Preference has higher priority than MED.
upvoted 1 times
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1f01b87
2 weeks, 3 days ago
Selected Answer: C
The BGP multi-exit discriminator (MED) attribute is used in BGP configurations to influence the choice of path in an active/passive setup by prioritizing one path over another for egress traffic. This is ideal for a design that uses only one VLAN attachment at a time.
upvoted 1 times
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1f01b87
2 weeks, 3 days ago
Selected Answer: C
It's C as per this google doc. https://cloud.google.com/network-connectivity/docs/interconnect/how-to/dedicated/configuring-onprem-routers#configuring-devices-for-activepassive-forwarding
upvoted 2 times
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RKS_2021
3 weeks, 6 days ago
Selected Answer: A
A is correct
upvoted 1 times
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b0b25
1 month, 1 week ago
Selected Answer: A
Local Preference is used to influence egress traffic within an Autonomous System (AS). It determines which exit point to use for outbound traffic
upvoted 2 times
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