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Difficulty: HardPlanning Network Load Balancing, Cloud DNS, and Cloud CDN

A financial services company is planning the Google Cloud networking architecture for a high-frequency telemetry service deployed on Compute Engine instances across two subnets in the us-central1 region. The service receives internal traffic originating from on-premises systems connected via Cloud Interconnect. The application uses a proprietary non-HTTP TCP protocol and strictly requires that backend instances receive the original client source IP address intact for security auditing. Which Google Cloud load balancer should you select to meet these technical requirements?

  1. Internal Passthrough Network Load BalancerAnswer
  2. B
    Internal Application Load Balancer
  3. C
    External Passthrough Network Load Balancer
  4. D
    Regional External Application Load Balancer

Answer

Internal Passthrough Network Load Balancer
The Internal Passthrough Network Load Balancer is a regional Layer 4 load balancer that handles internal TCP/UDP traffic within Google Cloud or connected on-premises networks via Cloud Interconnect. Because it is non-proxied (passthrough), it preserves the client's original source IP address in the packet header and supports non-HTTP TCP traffic.

Step-by-Step Solution

1
Analyze traffic scope and origin.
Traffic comes from on-premises over Cloud Interconnect into the internal VPC network, requiring an internal load balancer.
External load balancers require public IP frontends and are designed for internet-facing traffic.
2
Analyze protocol requirements.
Workload uses a proprietary non-HTTP TCP protocol, requiring a Layer 4 (L4) load balancer.
Layer 7 (L7) Application Load Balancers only support HTTP, HTTPS, HTTP/2, and gRPC protocols.
3
Analyze IP preservation requirements.
Backend instances require direct access to original client source IP addresses.
Passthrough load balancers route packets directly to backend instances without proxying or translating client source IP addresses.

Key Concept

Selecting GCP Load Balancers based on Traffic Scope (Internal vs External), OSI Layer (L4 Passthrough vs L7 Proxy), and Client IP Preservation
Estimated Time:2m 0s
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Topics

Planning Network Load Balancing, Cloud DNS, and Cloud CDN

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