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

A DevOps engineering team is designing the network architecture for an internal real-time metrics ingestion service hosted on Compute Engine instances across multiple zones within a single region. The service receives incoming data via a custom raw TCP protocol on port 9090. The backend instances must receive the original client IP addresses to perform IP-based rate limiting and logging. All client traffic originates from within the internal Virtual Private Cloud (VPC). Which Google Cloud load balancer should you choose for this workload?

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

Answer

Internal Passthrough Network Load Balancer
An Internal Passthrough Network Load Balancer is a Layer 4 regional load balancer that routes internal VPC TCP/UDP traffic directly to backend instances without proxying, preserving the original client source IP address.

Step-by-Step Solution

1
Identify the network scope and traffic origin requirement.
Traffic originates strictly from within the internal VPC.
Internal VPC communication requires an internal load balancing service rather than an external load balancer.
2
Identify protocol requirements at Layer 4 versus Layer 7.
The service uses a non-HTTP raw TCP protocol on custom port 9090.
Application load balancers operate at Layer 7 for HTTP/HTTPS workloads, whereas Network load balancers operate at Layer 4 for arbitrary TCP/UDP traffic.
3
Verify client IP preservation capability.
Backend instances require the original client source IP address preserved directly in packet headers.
Passthrough load balancers deliver packets directly to backend instances without proxying or translating the source IP address.

Key Concept

Selecting GCP Load Balancers based on Traffic Scope, Protocol, and Client IP Preservation
Estimated Time:1m 30s
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Topics

Planning Network Load Balancing, Cloud DNS, and Cloud CDN

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