# GBS Connected Learning Environment: Network Infrastructure
> Explore a technical redesign for GBS learning environments, featuring IPv4 subnetting, stress testing for 1,200 users, and Layer 3 infrastructure upgrades.

Tags: network-design, infrastructure, ipv4-subnetting, vlan, technical-review, gbs-learning, cybersecurity, network-topology
## GBS Connected Learning Environment: Technical Infrastructure Redesign

## Project Scope & Objectives
*   **Goal**: Redesign GBS systems to support 1,200 concurrent students and 255 staff.
*   **Technical Goals**: Implement IPv4 private addressing (RFC1918) and effective subnetting.
*   **Budget**: Maximum redesign budget of £45,000.

## System Integration Map
*   **Student Learning Network (A1)**: 172.16.90.0/25.
*   **Core Services Network (A3)**: 172.16.90.192/27.
*   Networks are logically separated via subnet masks to prevent broadcast storms while sharing a physical gateway.

## Stress Scenarios
*   **Peak Login Period**: 600 simultaneous logins within 5 minutes. High stress on Core Services (A3) Authentication Server.
*   **Exam Submission Window**: 800 concurrent submissions within 10 minutes. Critical stress on A1 Student Gateway bandwidth and CPU.

## Security and Failure Analysis
*   **Dependencies**: Heavy reliance on SaaS-hosted Learning Management System (LMS).
*   **Risks**: DNS poisoning, TLS certificate expiration, and Hybrid Active Directory link failures are identified as critical availability threats.

## Proposed Improvements
*   **VLAN & Layer 3**: Upgrade to Layer 3 switches to support /22 subnets (1,022 hosts per segment).
*   **Redundancy**: Deploy HSRP/VRRP redundant gateways to eliminate single points of failure.
*   **Budget Justification**: Enhances security and future-proofs the environment within the £45k constraint.
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