Network Virtualization and Overlay Networks Questions

Focuses on design, implementation, and operational management of virtual networks and overlay architectures used to support multitenancy and flexible topology. Candidates should be able to explain encapsulation based overlay designs such as virtual extensible local area networks and how overlays interact with the physical underlay, tunnel termination points and identifier mapping, overlay control plane options for reachability, addressing and tenant isolation strategies, integration with container networking and virtual machine networking, and the relationship with network function virtualization and virtual appliances. Interviewers will probe understanding of operational concerns including encapsulation overhead and maximum transmission unit impacts, approaches to troubleshooting visibility and packet capture in overlay environments, scaling patterns and control plane sizing, and security and segmentation techniques appropriate for multi tenant environments.