A Cisco Router Lab is a hands-on practice environment for learning, configuring, and troubleshooting Cisco networks from the foundational CCNA level all the way to the expert CCIE level.
This hands-on lab configures Type 3 LSA filtering at an ABR to selectively block specific inter-area routes from propagating into a neighboring area, achieving more granular control than the all-or-nothing summarization or stub area behaviors covered earlier in this series.
This hands-on lab configures aggressive OSPF hello and dead timers using the fast-hello feature, achieving sub-second failure detection without relying on BFD, and compares the resulting convergence speed against the default timers used throughout earlier OSPF labs in this series.
This hands-on lab adds MD5 authentication to the NTP configuration covered in an earlier lab, verifying a client only synchronizes with a server presenting the correct key and rejects time updates from an unauthenticated or mismatched source.
This hands-on lab presents a multi-fault scenario spanning an incorrectly configured EIGRP stub causing a routing black hole, an overly broad OSPF Type 3 filter blocking unintended routes, and a broken NTP authentication chain, requiring systematic diagnosis across three advanced technologies covered in recent labs.
This hands-on lab creates a CLI template in a DNA Center-style provisioning workflow using variables for site-specific values, applies it to two different devices, and verifies each device receives a customized configuration generated from the same single template.
This hands-on lab combines IP SLA monitoring with an EEM applet to simulate a simplified assurance-style health check, automatically classifying a link's health based on measured performance thresholds and logging a clear status change when the link degrades.
This hands-on lab configures a router to redirect all client DNS queries toward a security-focused DNS resolver using DNS forwarding interception, approximating cloud-delivered DNS security enforcement without requiring per-client configuration changes.
This hands-on lab configures MD5 authentication on an HSRP group, verifying two routers with matching authentication strings form a normal active/standby relationship while a router with a mismatched string is excluded from the group entirely.
This hands-on lab runs EIGRP as the dynamic routing protocol across the DMVPN hub-and-spoke topology built in earlier labs, verifying neighbor relationships form correctly across the multipoint tunnel and routes propagate without requiring per-spoke static configuration on the hub.
This hands-on lab runs OSPF as the dynamic routing protocol across the same DMVPN hub-and-spoke topology, configuring the tunnel interface as an OSPF point-to-multipoint network type to correctly handle the hub-and-spoke adjacency pattern without requiring the broadcast network type's DR/BDR election.
This hands-on lab runs iBGP as the routing protocol across the same DMVPN hub-and-spoke topology used in the two previous labs, configuring the hub as a route reflector so spokes learn each other's routes without a full iBGP mesh, combining two previously separate concepts into one integrated design.
This hands-on lab presents a complex multi-layer failure across an integrated BGP-over-DMVPN topology combined with QoS marking, requiring systematic diagnosis of a route reflector misconfiguration, an NHRP registration failure, and an incorrectly applied QoS policy simultaneously affecting the same network.
