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.

#network-design#infrastructure#ipv4-subnetting#vlan#technical-review#gbs-learning#cybersecurity#network-topology

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FLY-TECH

Technical Design Review: GBS Connected Learning Environment

Proposed Infrastructure Redesign by Fly-Tech

Group 9 | 2-Member Configuration

[Your Name] — Task A1: Student Network

[Partner Name] — Task A3: Core Services

April 2026

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PROJECT SCOPE & OBJECTIVES

Client Requirements

Redesign GBS systems to support 1,200 concurrent students and 255 staff.

Technical Goals

Implement IPv4 private addressing (RFC1918) and demonstrate effective subnetting.

Constraint Management

Operating within a maximum redesign budget of £45,000.

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PART B – SYSTEM INTEGRATION MAP

Internet

Physical Gateway

Central Router / Gateway

Student Learning Network (A1)

        172.16.90.0/25
      

Core Services Network (A3)

        172.16.90.192/27
      

Both networks share the same physical gateway

Logically separated via subnet masks — prevents broadcast storms

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DATA FLOW ANALYSIS

Authentication Path

Student Device (A1)

Local Switch

Router Gateway

Core Auth Server (A3)

External Access

Internal Traffic

Router

1 Gbps Leased Internet Connection

Cloud LMS

Traffic is prioritized for academic continuity — the Student Network holds the largest address pool.

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PART C – STRESS SCENARIO 1: PEAK LOGIN PERIOD

600

Simultaneous Logins

within a 5-minute window

System Stress Level

HIGH

Stressed Component

Core Services (A3) Authentication Server

OS Response Mechanism

Process Scheduling & Queueing

Outcome

Prevents system crashes by distributing login queue processing

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PART C – STRESS SCENARIO 2: EXAM SUBMISSION WINDOW

800

Concurrent Submissions

within a 10-minute window

System Stress Level: CRITICAL

92%

Normal Elevated High Critical

Constrained Resource

Network Bandwidth & Router CPU at A1 Student Gateway

Impact

High latency or packet loss at submission peak

Risk

Delayed confirmation for student submissions — potential academic impact

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Part D – Internet Dependency Path

End-User Device

Local Network

DNS

Internet Gateway

ISP

Cloud LMS

Critical Dependency: System relies on a SaaS-hosted Learning Management System for core academic delivery

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SECURITY FAILURE ANALYSIS

DNS FAILURE

If DNS is poisoned or fails → students cannot reach the LMS

⚠ Availability: TOTAL LOSS

TLS/HTTPS TRUST FAILURE

Expired or untrusted certificates → browser blocks access

Integrity: COMPROMISED

Confidentiality: COMPROMISED

AUTHENTICATION FAILURE

Hybrid Active Directory link failure → no login to any cloud resource

Availability: IMPACTED

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IDENTIFIED LIMITATIONS & RISK ASSESSMENT

HIGH

Address Scarcity

/25 subnet (126 IPs) is insufficient for 1,200 concurrent student users at peak times

HIGH

Single Point of Failure

Current design has no redundancy in the Core Services router — one failure brings down all services

MEDIUM

Scalability Limitation

Legacy Layer 2 infrastructure limits ability to implement modern VLAN segmentation

Risk Level: ■ HIGH ■ MEDIUM

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PROPOSED IMPROVEMENTS — £45,000 BUDGET

VLAN Implementation & Layer 3 Upgrade

Upgrade to Layer 3 switches and implement VLANs to expand address pool to /22 — supporting 1,022 hosts per segment

Redundant Gateway Deployment

Deploy HSRP/VRRP redundant gateway at the core — eliminates single points of failure

Budget Justification

Improves Availability — eliminates SPOF

Enhances Security — VLAN segmentation

Future-proofs the network — scalable /22 space

Within £45,000 Fly-Tech Budget Constraints

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CONCLUSION & SUMMARY

A functional, subnetted IPv4 environment — with a clear path to improvement.

The design fulfils Group 9's requirement for a fully subnetted IPv4 environment supporting both A1 and A3 network segments.

Further investment in redundancy (HSRP/VRRP) and VLAN segmentation is recommended to future-proof the GBS infrastructure.

1,200

Students Supported

255

Staff Supported

£45,000

Max Budget

Network Segments

/25 → /22

Proposed Expansion

HSRP/VRRP

Redundancy Protocol

Group 9 | Fly-Tech | April 2026

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References

Brookshear, G. and Brylow, D. (2022) Computer Science: An Overview. 13th edn. Pearson.

Tanenbaum, A.S., et al. (2021) Computer Networks. 6th edn. Pearson.

NCSC (2026) The National Cyber Security Centre. [Online] Available at: ncsc.gov.uk

All references formatted in Harvard citation style.

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