Answer is "A":
https://www.cisco.com/c/en/us/td/docs/switches/datacenter/sw/nx-os/vxlan/configuration/guide/b_NX-OS_VXLAN_Configuration_Guide/campus-fabric.pdf
"Fabric Edge Node : Fabric edge nodes are responsible for admitting, encapsulating/decapsulating and
forwarding traffic to and from endpoints connected to the fabric edge"
A is true and B is equally true. Consider that an SD-Access Fabric Edge Node is a LISP tunnel router (xTR). Given the LISP definition of xTR from the Official Cert Guide:
* Ingress tunnel router (ITR): ITRs are LISP routers that LISP encapsulate IP packets coming from EIDs that are destined outside the LISP site.
* Egress tunnel router (ETR): ETRs are LISP routers that de-encapsulate LISP-encapsulated IP packets coming from sites outside the LISP site and destined to EIDs within the LISP site.
* Tunnel router (xTR): xTR refers to routers that perform ITR and ETR functions (which is most routers).
Therefore the Edge Node is tunneling endpoint (EID) traffic.
So I agree here but there's an extra cavate in that the SD-Access could be using VXLAN for the data plane which would mean that the end-user data is technically encapsulated by VXLAN then LISP on top of it. B is true in some regards but this interpretation would mean that choice A is more true.
Control Plane Nodes: Map system that manages endpoint-to-device relationships
Fabric Border Nodes: A fabric device (for example, Core) that connects the external Layer 3 networks to the SD-Access fabric
Fabric Edge Nodes: A fabric device (for example access or distribution) that connects wired endpoints to the SD-Access fabric
The role of the fabric Edge node is to provide connectivity to wired endpoint by forwarding traffic to and from endpoints connected to the fabric edge.
B is not wrong but its not its main job:
A fabric edge provides a single Layer 3 anycast gateway (that is, the same SVI with the
same IP address on all fabric edge nodes) for its connected endpoints and also performs the
encapsulation and de-encapsulation of host traffic to and from its connected endpoints.
From cisco official book.
Book: CCNP and CCIE Enterprise Core ENCOR 350-401 Official Cert Guide
Page: 622
Fabric edge node: This fabric device (for example, access or distribution layer device)
connects wired endpoints to the SDA fabric.
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