Exam 300-420 topic 1 question 50 discussion

I think it's B. Not A; VN to another VN is not external to the fabric, so this is not what we need here. Could be B; your VN will be mapped to a VRF, and so providing access to networks outside the SDA. Not C; fabric to fabric; nope. Not D; fabric edge is device connecting clients, not providing external access (that's a border node's job).

I think the answer is B - "Fabric border routers handle the ingress & egress traffic for the SD-Access fabric, they are responsible for translating the policy, VRF & SGT information between the SD-Access fabric and the external networks." Boson ExSim-Max for Cisco 350-401 ENCOR. Reference Cisco SD-Access Solutions Design Guide (CVD): SD-Access Solutions Components.

Fabric borders use VRFs to map VNs to VRFs: This method uses VRFs to map VNs to VRFs at the fabric border. The fabric border is the edge of the fabric where it connects to other networks or services. The VRFs are used to separate the traffic between different VNs, and they are used to route the traffic between the fabric and the outside networks.

This question is not even fair, All of the answers are actually correct, these are methods that Endpoints use to get to the Outside Resources. However, Answer D has to be the best answer as the Edge Node is the first Node the Endpoints reach so that traffic leaves the Fabric. Crazy question and i doubt we will get this one on the exam because of how uncertain the question is.

A Fusion device enables Virtual routing and forwarding (VRF) leaking across SD-Access Fabric domains, and enables host connectivity to shared services, such as DHCP, DNS, NTP, ISE, Cisco DNA Center, Wireless LAN Controllers (WLC), and similar.

it is definelty D

Obviously Border node is an exit to external networks, but in the answer D, they are saying about "fabric edge" (they do not say "Edge node"), so if they mean that Border node is a "fabric edge", which is true, the rest of the sentence is also true, that's why D might is correct. That's tricky answer, so I am not sure.

https://www.cisco.com/c/en/us/td/docs/solutions/CVD/Campus/cisco-sda-design-guide.html#Border_Node ● Network virtualization extension to the external world—The border node can extend network virtualization from inside the fabric to outside the fabric by using VRF-lite and VRF-aware routing protocols to preserve the segmentation.

Answer A is not correct as the Fusion Routers have no concept of a VN. Only the Fabric Borders and Fabric Edges use VN's. ENSLD 300-420 CCNP Enterprise Design Official Cert Guide Chapter 10: SD-Access Design page 334 "The border design for the SD-Access fabric involves connectivity to the outside or external networks." As aai5548 already mentioned, the question states "access to the outside", B is the only that facilitates this.

Whatever it is doing, it is the border node doing it, so I will go for B 'border router'

Im going with B. I don't like how A answer is worded. VRF Fusion Router?

Answer is B

i think its B , https://www.cisco.com/c/dam/m/hr_hr/training-events/2019/cisco-connect/pdf/VH-Cisco-SD-Access-Connecting.pdf

I think D is correct: Fabric Intermediate Node: Fabric intermediate nodes provide the Layer-3 underlay transport service to fabric traffic. These nodes are pure layer-3 forwarders that connect the Fabric Edge and Fabric Border nodes.

Answer is B

I believe is D: Fabric Edge Node : Fabric edge nodes are responsible for admitting, encapsulating/decapsulating and forwarding traffic to and from endpoints connected to the fabric edge. Fabric edge nodes lie at the perimeter of the fabric and are the first points for attachment of the policy. It is to be noted that the endpoints need not be directly attached to the fabric edge node. They could be indirectly attached to a fabric edge node via an intermediate Layer-2 network that lies outside the fabric domain. Traditional Layer-2 networks, wireless access points or end-hosts are connected to Fabric Edge nodes.

Official Cert Guide ENSLD 300-420 pag 345 question 25 : What is the next hop after the border nodes to external network ? answer :Fusion router are the next hop after the border router to external network. I think a