Part 20 lab, Standard ACLs Configuration скачать в хорошем качестве

Part 20 lab, Standard ACLs Configuration

Everything was working. NAT translations? ✅ Internet access? ✅ OSPF neighbors? ✅ Then one ACL was applied… And the network silently collapsed. In this deep-dive lab, I break down how Access Control Lists (ACLs) interact with: NAT (PAT Overload) OSPF (Routing Protocol 89) VLAN segmentation (10 / 20 / 30) Real Cisco CLI configuration 🔥 What you’ll learn: ✔ What an ACL really does ✔ Standard vs Extended ACL (and why standard can be dangerous) ✔ Why NAT changes ACL design ✔ Why OSPF MUST be explicitly permitted ✔ Correct interface placement (Inbound LAN side) ✔ Packet processing order: ACL → Routing → NAT → Exit Most engineers forget this: OSPF is NOT TCP. OSPF is NOT UDP. It’s protocol 89. Block it once… And your routing adjacency dies instantly. This lab demonstrates: • Allow VLAN 10 & 30 • Block VLAN 20 • Keep NAT working • Keep OSPF stable And most importantly… How to design ACLs without breaking your entire infrastructure. If you're serious about: Cybersecurity 🔐 Enterprise Networking 🌐 Cloud Architecture ☁️ AI Infrastructure 🤖 Then mastering ACL logic is mandatory. Because in real networks… Failure is silent. #CyberSecurity #Networking #CCNA #Cisco #AccessControlList #NAT #OSPF #CloudComputing #AIInfrastructure #NetworkEngineer #ITSecurity #RoutingAndSwitching #TechEducation