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CCNP Switching – Revision & Interview Preparation Notes
Switching is the backbone of every enterprise network, and mastering it is essential for network engineers aiming for CCNP and advanced networking roles.
These CCNP Switching notes are designed for quick revision, concept clarity, and interview preparation, covering key switching technologies used in real-world enterprise environments.
Whether you’re preparing for certification or brushing up your skills for interviews, consistent practice and strong fundamentals make all the difference. 💡
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DMVPN – Dynamic Multipoint Virtual Private Network 🔐🌐

DMVPN is a Cisco VPN technology designed to connect multiple branch sites securely using dynamic tunnels — without configuring point-to-point VPNs for every location.

Instead of managing hundreds of static tunnels, DMVPN builds them on demand.

How DMVPN actually works (no theory):

mGRE → Single tunnel interface, multiple dynamic peers

NHRP → Resolves private tunnel IPs to public WAN IPs

IPsec → Encrypts all traffic end-to-end

DMVPN Phases (know this for interviews):

Phase 1: Hub-and-Spoke (all traffic via hub)

Phase 2: Dynamic Spoke-to-Spoke tunnels

Phase 3: Optimized routing with NHRP redirect

Why...