Cisco ENCOR Cheat Sheet 2026

The 30 highest-yield Cisco ENCOR facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. What control plane protocol is utilized to map and resolve endpoints in a Cisco SD-Access fabric? → LISP
2. In an MPLS network, what does the term 'LSP' stand for? → Label Switched Path
3. In MPLS Segment Routing (SR-MPLS), what does a Node Segment ID (SID) represent? → A globally unique MPLS label identifying a specific router
4. Which command enables TACACS+ as the authentication method for console login on a Cisco IOS device? → aaa authentication login default tacacs+
5. What is the purpose of SNMP traps? → Send asynchronous event notifications from agent to manager
6. Which OSPF LSA type is generated by an ASBR to advertise external routes into the OSPF domain? → Type 5 (AS External LSA)
7. After making changes to settings on a switch in CONFIGURATION mode, only the most recent modifications will be implemented. → After you type copy running startup and reboot the switch
8. In EIGRP, what occurs when a router loses its Successor and no Feasible Successor exists in the topology table? → It enters Active state and sends QUERY messages to all neighbors
9. In a Cisco SD-WAN fabric, which component is responsible for distributing OMP routes and policies between vEdge/WAN Edge routers? → vSmart
10. What is a key advantage of using VXLAN over traditional VLANs in large data centers? → Support for up to 16 million segments vs 4,096 VLANs
11. In IPv6, which address type is equivalent to an IPv4 private (RFC 1918) address and is routable only within an organization? → Unique Local (FC00::/7)
12. Which header field uniquely identifies a VXLAN segment and is carried in the VXLAN header? → VNI (VXLAN Network Identifier)
13. Which spanning tree port state forwards traffic AND learns MAC addresses? → Forwarding
14. Which Cisco SD-WAN component acts as the orchestrator and facilitates initial authentication of WAN Edge routers? → vBond
15. What is produced once labels are exchanged over LDP between two routers? → LFIB
16. Removes one character0 → Ctrl-D
17. In the Cisco SD-Access architecture, what technology is used to offer Layer 2 and Layer 3 logical networks? → overlay network
18. Which show command displays the MPLS label forwarding information base (LFIB) on a Cisco router? → show mpls forwarding-table
19. In MPLS, what is a Label Switch Router (LSR) that only has other LSRs as neighbors called? → Provider (P) core router
20. What is the function of IP SLA in Cisco IOS? → Proactively measure network performance metrics like latency, jitter, and packet loss
21. What is the effect of configuring 'vtp mode transparent' on a Cisco switch? → The switch forwards VTP advertisements but does not apply them to its local VLAN database
22. What control plane protocol is employed between vSmart controllers and Cisco SD-WAN routers? → OMP
23. What is the function of a Cisco DNA Center intent-based networking API? → Express the desired network state and let the platform determine how to implement it
24. What is the primary function of MACsec (IEEE 802.1AE)? → Encrypt and integrity-protect traffic at Layer 2 on a hop-by-hop basis
25. Which OSPF network type is used by default on a point-to-point serial link? → Point-to-point
26. Which QoS model provides per-flow resource reservation using RSVP signaling? → IntServ
27. What type of ACL can filter traffic based on both source and destination IP, and also TCP/UDP port numbers? → Extended ACL
28. Which protocol is used by NETCONF to transport configuration data between the manager and network devices? → SSH
29. Which feature builds upon DHCP Snooping to prevent hosts from sending traffic with a spoofed source IP? → IP Source Guard
30. Which Spanning Tree Protocol feature allows a port to immediately transition to forwarding state when connected to an end device? → PortFast