Exam 200-301 topic 1 question 36 discussion

Ref: Cisco Data Center Spine-and-Leaf Architecture: Design Overview White Paper – Cisco “… Spine-and-leaf architecture … With a spine-and-leaf architecture, no matter which leaf switch to which a server is connected, its traffic always has to cross the same number of devices to get to another server (unless the other server is located on the same leaf). …” A. Each link between leaf switches allows for higher bandwidth. Wrong answer. B. It provides greater predictability on STP blocked ports. Wrong answer. C. It provides variable latency. Wrong answer. D. Each device is separated by the same number of hops. Correct answer.

D. Each device is separated by the same number of hops. In spine-and-leaf architecture, all connected devices are a fixed number of hops away from any other device on the network. This design is a fundamental feature of the spine-and-leaf architecture, as it provides low latency and predictability in communication between devices, regardless of where they are connected on the network.

D. Each device is separated by the same number of hops. is correct

D is indeed correct

Agree with jonathan126

While it’s true that spine-and-leaf architecture can provide higher bandwidth, it’s not because of the links between leaf switches. The higher bandwidth is achieved through multiple active links between the leaf and spine switches.

In a spine-and-leaf network architecture, each link between leaf switches typically allows for higher bandwidth. D is not entirely correct as it idoes not depend from the number of hops

Leaf cannot be connected to another leaf; spine cannot be connected to another spine. Therefore, leaves will always connect to the same number of spines and vice versa, meaning equal hops for each.

A. Each link between leaf switches allows for higher bandwidth. The spine-and-leaf architecture is a network topology commonly used in data centers to provide high bandwidth, low latency, and scalability. In this architecture, network switches are organized into two layers: the spine layer and the leaf layer. In a spine-and-leaf architecture, each leaf switch is connected to every spine switch, and the connections between these switches provide high bandwidth. This is in contrast to traditional network topologies like hierarchical designs, where not all devices are directly connected to each other. The statement "Each link between leaf switches allows for higher bandwidth" is correct because every leaf switch is connected to every spine switch, forming multiple parallel paths for data to travel between devices. This arrangement ensures that the available bandwidth is effectively aggregated and distributed across all the links, resulting in increased overall network capacity.

From what I understand A) but I'm open to opinions Spine-and-leaf architecture is a type of network topology in which switches are arranged in a leaf layer that connects to a spine layer. The spine layer acts as the core of the network, while the leaf layer provides access to endpoints such as servers or storage devices. A characteristic of this architecture is that it allows for high bandwidth and low latency, as well as scalability and flexibility in adding or removing leaf switches.

A - Incorrect since leaf switches do not connect to each other B - Incorrect. It might help a bit on the port role due to uniform structure, but the blocked ports still depends on the MAC address, so different MAC address will affect the blocked ports -> not predictable C - incorrect. I think the latency would be quite predictable as the hop count is uniform. The latency will also affect by the transmission medium and has nothing to do with the LAN architecture. D - Each "end" device is separated by the same number of hops would be better, as hop count between leaf switch is 2 but hop count between leaf and spine switch is 1. Correct me if I am wrong..

D is the answer because Leaf switches do not connect each other

A solution that has been proposed is a spine and leaf topology, a topology that ensures that all devices are the same number of network hops away, thereby providing predictable and consistent network latency.

D is correct! Find the subnet mask *To have 20 User in a subnet We have to use /27 prefix * So Host count for /27 prefix is (2^5-2)=30 * Subnet Mask for /27 prefix is (sum of Network bits (128+64+32)=224 , so 255.255.255.224 Find the network ID *As per the /27 prefix each subnet has 30 host and 32 including network ID & Broadcast ID * so first network ID is 10.10.255.0 and the second will be 10.10.255.32

D is correct.

There are no direct links between leaf nor between spine

Correct answer is "A" bc. of absence of stp all links are active and pass the traffic .