2.3 Describe network virtualization concepts

This checkpoint is published through the child objectives. LISP and VXLAN are describe and recognize topics in ENCOR v1.2. Do not turn this into a full data center EVPN or SD-Access deployment guide.

For ENCOR, you should be able to:

• explain the LISP split between endpoint identity and routing locator;
• recognize EID, RLOC, map server, map resolver, and xTR roles;
• explain why SD-Access uses a control-plane mapping idea instead of flooding endpoint reachability everywhere;
• explain VXLAN as Layer 2 over Layer 3 encapsulation;
• distinguish VNI, VTEP, underlay, overlay, and edge VLAN mapping;
• read a packet-walk scenario and identify whether the problem is in underlay reachability, overlay mapping, or edge attachment.

Exam checklist

Host EID on Edge-2 -> Edge-1 asks map resolver for EID location -> Answer RLOC Edge-2 · encapsulate toward peer -> VXLAN · VLAN 10 to VNI 10010 · UDP/4789 to VTEP