CCIE

An endpoint plugs into a port. Somehow, seconds later, it is in the right virtual network, carrying the right security

An SD-Access fabric is not a pile of switches. It is a set of roles, and every switch in

Before an SD-Access fabric can do anything clever - before LISP, before VXLAN, before a single policy - it needs one

Transport technologies fail in layers, and the art of troubleshooting them is knowing which layer to suspect. An MPLS L3VPN

Almost every mid-to-large enterprise WAN ends up running both MPLS and DMVPN. Not because someone planned it that

Every DMVPN carries IPsec, and every IPsec deployment sits on one of two key-exchange protocols: IKEv1, the original from