تصميم وتأمين شبكة بنكية باستخدام Cisco وZero Trust

تصميم وتنفيذ بيئة شبكة لمؤسسة بنكية مع تقسيم الشبكة باستخدام VLANs، وتطبيق سياسات أمان وعزل بين أجزاء الشبكة، بالإضافة إلى إعداد Firewall واتباع مبادئ Zero Trust لتحسين مستوى الحماية. 📌 We designed and implemented a secure, scalable, and high-availability network for a fictional multi-branch bank, following Zero Trust and Least Privilege security models across all layers. 🛡 𝗘𝗻𝗱-𝘁𝗼-𝗘𝗻𝗱 𝗦𝗲𝗰𝘂𝗿𝗶𝘁𝘆 𝗔𝗿𝗰𝗵𝗶𝘁𝗲𝗰𝘁𝘂𝗿𝗲: 🔒 VLAN Segmentation for HR, Finance, CCTV, ATM, Voice & Guest. 🚫 Guest VLAN isolated with Internet-only + bandwidth limits. 🔐 IPsec Site-to-Site VPNs between HQ & branches. 🧱 Firewall Zones (Inside / DMZ / Outside) with Static Nat. 🎯 Port Security, BPDU Guard, DHCP Snooping, DAI – all enforced. 🕵‍♂ CDP & Proxy ARP Disabled to mitigate info leaks & ARP attacks 🔁 𝗥𝗲𝗱𝘂𝗻𝗱𝗮𝗻𝗰𝘆 & 𝗥𝗼𝘂𝘁𝗶𝗻𝗴 ✅ OSPF Routing (Auth-enabled + Passive Interfaces). ⚙ HSRP for dual ISP failover & high availability 🔐 𝗣𝗼𝗹𝗶𝗰𝘆 & 𝗔𝗰𝗰𝗲𝘀𝘀 𝗖𝗼𝗻𝘁𝗿𝗼𝗹 - ACLs isolate sensitive VLANs (ATM/CCTV) - Guest VLAN blocked from internal resources - Least Privilege enforced end-to-end 🧪 𝗧𝗲𝘀𝘁𝗶𝗻𝗴 & 𝗩𝗮𝗹𝗶𝗱𝗮𝘁𝗶𝗼𝗻 ✅ VPN tunnel uptime validation. ✅ ACL effectiveness tests. ✅ Vulnerability scanning & ARP/DHCP spoof test cases. 🎯 𝗞𝗲𝘆 𝗥𝗲𝘀𝘂𝗹𝘁𝘀: 🔐 Zero Trust enforced across the architecture 🌐 24/7 Secure Connectivity with HSRP + IPsec 🧠 Scalable design with OSPF & VLAN models 💡 Cost-effective enterprise solution using Cisco hardware