Exam 350-401 topic 1 question 38 discussion

There is a paragraph in the book that says it's routed access!!!

Ideal design is routed access – allows fabric to extend to very edge of campus network

D is correct

correct answer provided

routed access or layer 3 access

SD-WAN builds on top of IP fabric

D is correct. SDA is full routed access

D. Routed access is the design that facilitates a migration from a traditional campus design to a programmable fabric design. In a traditional campus design, the access layer is typically implemented using a Layer 2 switch with VLANs, and the distribution layer performs the routing between VLANs. In contrast, a programmable fabric design uses a routed access layer, where each access switch has an IP address and performs routing locally, eliminating the need for a separate distribution layer. By implementing a routed access design, the company can gradually migrate from a traditional campus design to a programmable fabric design. The Layer 2 access and two-tier designs are both traditional campus designs and do not facilitate the migration to a programmable fabric design. The three-tier design includes a distribution layer, which is not needed in a programmable fabric design with routed access.

Option D (routed access) is not necessarily wrong, but it is not the best answer to the question. Routed access can be used with a programmable fabric design, but it does not necessarily facilitate the migration from a traditional campus design to a programmable fabric design. In a routed access design, the access layer switches are configured as Layer 3 devices, and traffic is routed directly from the access layer to the distribution or core layer. This approach can provide greater flexibility and scalability than traditional Layer 2 access designs, but it does not necessarily facilitate the migration to a programmable fabric design. On the other hand, a three-tier architecture provides the necessary separation between the access, distribution, and core layers, which allows for greater flexibility and scalability when implementing programmable fabric designs. This is why option C (three-tier) is a better answer to the question.

D Layer 3 Routed Access—The use of a Layer 3 routed access network for the fabric provides the highest level of availability without the need to use loop avoidance protocols such as Spanning-Tree (STP), interface bundling techniques using link aggregation technologies such as EtherChannel, and Layer 2 redundancy technologies like StackWise Virtual (SVL), Virtual Switching System (VSS), or Nexus Virtual Port-Channels (vPCs). Reference: https://www.cisco.com/c/en/us/td/docs/solutions/CVD/Campus/cisco-sda-design-guide.pdf#%5B%7B%22num%22%3A37%2C%22gen%22%3A0%7D%2C%7B%22name%22%3A%22XYZ%22%7D%2C272%2C708%2C0%5D

D is correct

Router-Access

Ref: CCDE Study Guide: Enterprise Campus Architecture Design “C H A P T E R 3 Access-Distribution Design Model … • Classical multitier STP based: This model is the classical or traditional way of connecting access to the distribution layer in the campus network. In this model, the access layer switches usually operate in Layer 2 mode only, and the distribution layer switches operate in Layer 2 and Layer 3 modes. … • Routed access: In this design model, access layer switches act as Layer 3 routing nodes, providing both Layer 2 and Layer 3 forwarding. In other words, the demarcation point between Layer 2 and Layer 3 is moved from the distribution layer to the access layer. Based on that, the Layer 2 trunk links from access to distribution are replaced with Layer 3 point-to-point routed links, … The routed access design model has several advantages compared to the multitier classical STP-based access-distribution design model, …” A. two-tier Wrong answer. B. Layer 2 access Wrong answer. C. three-tier Wrong answer. D. routed access Correct answer.

routed access is the correct answer

routed access

The SDA Cisco Validated Design mentioned two-tier and three-tier with regard to the size of the network. Traditional three tier vs collapsed core. So it's probably routed access.

A Intent-based Networking (IBN) transforms a hardware-centric, manual network into a controller-led network that captures business intent and translates it into policies that can be automated and applied consistently across the network. The goal is for the network to continuously monitor and adjust network performance to help assure desired business outcomes. IBN builds on software-defined networking (SDN). SDN usually uses spine-leaf architecture, which is typically deployed as two layers: spines (such as an aggregation layer), and leaves (such as an access layer).