# GBS Connected Learning Network Infrastructure Redesign
> Technical review of an IPv4 infrastructure redesign for a learning environment, covering subnetting, stress testing, security analysis, and budget goals.

Tags: network-design, infrastructure-redesign, ipv4-subnetting, network-security, it-architecture, vlan-implementation, technical-review
## Technical Design Review: GBS Connected Learning Environment

- **Project Scope**: Redesign systems to support 1,200 concurrent students and 255 staff within a £45,000 budget.
- **Technical Goals**: Implementation of RFC1918 private addressing and logical separation of networks via subnetting.

## System Integration Map
- **Student Learning Network (A1)**: 172.16.90.0/25
- **Core Services Network (A3)**: 172.16.90.192/27
- **Architecture**: Networks share a physical gateway but are logically separated to prevent broadcast storms.

## Performance & Stress Scenarios
- **Scenario 1 (Peak Login)**: 600 simultaneous logins in 5 minutes. High stress on Core Services (A3) Authentication Server.
- **Scenario 2 (Exam Submission)**: 800 concurrent submissions in 10 minutes. Critical stress on Student Gateway bandwidth and router CPU.

## Security & Reliability Analysis
- **Dependencies**: Reliance on SaaS-hosted Learning Management System (LMS).
- **Failure Modes**: 
    - DNS Failure: Total loss of availability.
    - TLS/HTTPS Trust Failure: Compromised integrity and confidentiality.
    - Authentication Failure: Impacts cloud resource access.

## Identified Limitations
- **Address Scarcity**: Current /25 subnet (126 IPs) is insufficient for 1,200 concurrent users.
- **SPOF**: Single point of failure in the Core Services router.
- **Scalability**: Legacy Layer 2 infrastructure limits VLAN segmentation.

## Proposed Improvements (£45,000 Budget)
- **VLAN & Layer 3 Update**: Transition to /22 subnet supporting 1,022 hosts per segment.
- **Redundancy**: Deployment of HSRP/VRRP redundant gateways to eliminate single points of failure.

## Summary
- Target: 1,200 Students, 255 Staff.
- Proposed Expansion: /25 to /22 address pool.
- Key focus on availability, security, and future-proofing.
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