Exam N10-008 topic 1 question 141 discussion

General comment, as I don't have Contributer access, but I took this exam yesterday, and it contained maybe two of the questions contained in the first 20 pages on this site. Also, know that the first 5-6 questions were performance-based questions. They took so long to analyze, I skipped most of them, but still passed. I studied from three different sources (here, ExamCram, and a full CompTIA Network+ course at the local college. Good luck, gang. Sorry again for parachuting in, but I hope it helps someone.

I agree with D, from the Mike Meyers video course he says modern data centers which use virtualization all use spine and leaf architecture since around 2005, the three tier is the old way of doing things.

From the network+ passport: Spine and Leaf Virtualization and SDN freed the datacenter from the three-tiered model. In particular virtualization removes the need for the distribution/aggregation layer.

GPT says in a large Software-Defined Networking (SDN) environment that can be extended beyond the data center, the architecture that is most likely to be used is: D. Spine and leaf The spine and leaf architecture, also known as Clos architecture, is a scalable and flexible design commonly associated with data center networks. It is well-suited for large SDN deployments. This architecture provides high bandwidth, low latency, and easy scalability, making it a preferred choice for modern data centers, especially those with SDN implementations. In a spine and leaf architecture, the "spine" consists of a layer of core switches, and the "leaf" comprises access switches. This architecture allows for efficient east-west traffic (within the data center) and provides an excellent foundation for expanding beyond the data center while maintaining a highly scalable and manageable network. It aligns well with the principles of SDN and can support the dynamic, automated provisioning of network resources that SDN facilitates.

GPT nails it, by picking (D): " The datacenter architecture that will MOST likely be used in a large Software-Defined Networking (SDN) environment and can be extended beyond the datacenter is (D) Spine and leaf. The spine and leaf architecture is designed to handle high traffic loads and provide flexibility and scalability in datacenter networks, making it suitable for large SDN deployments. It involves a two-tier network design: the spine layer (consisting of high-speed switches) and the leaf layer (connecting to end devices). This architecture can be extended beyond the datacenter by connecting multiple datacenters or remote locations, creating a robust and interconnected network. Options (A) iSCSI and (B) FCoE are storage-related protocols and technologies, not datacenter network architectures. Option (C) Three-tiered network is a traditional network architecture but might not be as suitable for large SDN deployments. Option (E) Top-of-rack switching is a concept related to network switch placement rather than a comprehensive architecture like spine and leaf."

Spine and Leaf is designed to be better with distributed control of SDN. Spine and Leaf is good with extensions. Although here it says about beyond data centers to trick a logical person to question whether Spine and leaf will work in that case, especially when each spine switch needs to be connected to the leaf switches. But still it is the right answer. Another question with intention to trap

D. Spine and leaf is most likely to be used in a large SDN and can be extended beyond the datacenter. A spine-and-leaf architecture is a network topology in which a core layer of high-performance switches (the spine) is connected to a large number of edge switches (the leafs). This type of architecture is typically used in large datacenter networks and can be extended beyond the datacenter to connect multiple locations. The SDN can be used to control the spine and leaf netwo

Answer is D: A spine-leaf architecture is data center network topology that consists of two switching layers—a spine and leaf. The leaf layer consists of access switches that aggregate traffic from servers and connect directly into the spine or network core. Spine switches interconnect all leaf switches in a full-mesh topology.

D: seems right and not C: The key word is "beyond the dc": The main issue with this design for the modern data center is that intra-DC traffic is the new norm. Due to server-to-server traffic, three hops now quickly become four, five or more, adding significant latency per flow as well as increasing the risk of bottlenecks, buffer overruns and dropped packets. <https://www.wwt.com/article/comparing-two-tier-three-tier-data-center-networks>

i believe it is D. 2 tier has more advantages than 3 tier

3 tier Ref: https://www.professormesser.com/network-plus/n10-008/n10-008-video/network-architectures-n10-008/