Complete Guide to DHCP Snooping, How it Works, Concepts, DHCP Snooping Database, DHCP Option 82, Mitigating DHCP Starvation Attacks, DHCP Hijacking, Man-in-the-Middle Attacks & Rogue DHCP Servers

How IP DHCP Snooping works, trusted & untrusted ports, DHCP Snooping Binding Database, Cisco Catalyst & Nexus Licensing & Features, DHCP Snooping Option-82 Data Insertion. Preventing DHCP attacks and more. Catalyst Nexus switching supporting DHCP Snooping.
http://www.firewall.cx/cisco-technical-knowledgebase/cisco-switches/1215-understanding-dhcp-snooping-concepts-and-how-it-works.html

SD-WAN is the Emerging, Evolving Solution for the Branch Office

Why SD-WAN is replacing MPLS networks. How SD-WAN overcomes MPLS limitations and provide businesses with incomparable flexibility: Fast deployment, security, VPN support, QoS, reduced latency, adaptable bandwidth, mobility and zero-touch provisioning.
http://www.firewall.cx/general-topics-reviews/sd-wan/1213-sd-wan-evolving-solution-for-branch-offices.html