Cybersecurity Project · Network Security

Secure Enterprise Network Design

Three Cisco enterprise-network architecture case studies covering multi-site connectivity, secure data-center design, segmentation, firewall controls, and VPN architecture.

Academic / technical network-design project

Context & Scope

This project contains three related enterprise-network design case studies created in Cisco Packet Tracer. It demonstrates academic and technical network-security design experience and is not presented as professional Cisco network-engineering employment.

Objective

Design enterprise network architectures that combine availability, segmentation, routing, secure management, access control, perimeter security, and secure site-to-site connectivity.

Design Approach

Designed and documented three related enterprise-network case studies in Cisco Packet Tracer.
Developed a UK–Switzerland multi-site architecture using segmentation, routing, secure management, and inter-site connectivity.
Developed a secure data-center redesign incorporating VLAN segmentation, Layer 3 switching, ACLs, firewall controls, NAT/PAT, and DMZ concepts.
Developed a global HQ-to-branch architecture spanning San Francisco, Dubai, and Vancouver with routed connectivity and site-to-site IPsec VPN design.
Reviewed original configurations and topology decisions to identify security and design improvement opportunities.

Technical Implementation

Created original Packet Tracer network topologies for multiple enterprise scenarios.
Implemented VLAN segmentation and IPv4 subnetting to separate network functions and traffic.
Configured Layer 3 switching, static routing, and OSPF across the design scenarios.
Used ACLs and Cisco ASA concepts to control and restrict network access.
Implemented secure-management concepts including SSH configuration.
Documented DMZ, NAT/PAT, and site-to-site IPsec VPN configurations and supporting technical evidence.

Technical Evidence

Selected original Packet Tracer and configuration evidence from the three network-design case studies.

Cisco Packet Tracer UK and Switzerland multi-site enterprise topology — Original Packet Tracer topology for the UK–Switzerland multi-site enterprise-network case study.

Cisco network device SSH secure management configuration — Secure-management evidence showing SSH configuration within the data-center network case study.

Cisco Packet Tracer global headquarters and branch network topology — Global HQ-to-branch Packet Tracer architecture covering San Francisco, Dubai, and Vancouver.

Experience Boundary

These architectures were designed and documented in Cisco Packet Tracer as technical case studies. They demonstrate network-design and security concepts but do not represent production networks that I professionally operated for the organisations represented in the scenarios.

Security Relevance

The project demonstrates network segmentation, routing and switching, firewall-oriented access control, secure administrative access, DMZ concepts, VPN architecture, IP addressing, and the security implications of enterprise network-design decisions.