In this section, we explore the world of programming, algorithms, networks, and infrastructure
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.
