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1. network-multisite-ospf network-multisite-ospf Public

   Multi-site enterprise LAN/WAN routed with OSPF in Cisco Packet Tracer: structured addressing per site, dynamic routing across the WAN, and verified end-to-end reachability between every site.

2. network-bgp-dual-homed-edge network-bgp-dual-homed-edge Public

   Enterprise edge router dual-homed to two ISPs via eBGP, with primary/backup path control (local-preference + AS-path prepending), NAT, and a verified live failover test. Built in Cisco Packet Tracer.

3. network-ha-core-hsrp network-ha-core-hsrp Public

   Redundant default gateway using HSRP with per-VLAN load balancing, failover, and preemption — Cisco Packet Tracer lab, fully verified.

4. network-enterprise-wireless network-enterprise-wireless Public

   Enterprise wireless network with VLAN-segmented corporate and guest SSIDs, DHCP sized for 500+ users (/22), and ACL-based guest isolation — Cisco Packet Tracer lab, fully verified.

5. network-nac-port-security-radius network-nac-port-security-radius Public

   NAC with port-security and RADIUS — authorized devices get access, unauthorized devices are blocked. Simulates the Cisco ISE authentication foundation. Cisco Packet Tracer lab, fully verified.

6. network-qos-voice-video network-qos-voice-video Public

   Voice and video QoS on Cisco IOS in Packet Tracer: MQC class maps with LLQ for voice and CBWFQ for video and data, built and verified, with Packet Tracer's empty policy-map counters documented as a…