CDCP Network Infrastructure and Connectivity 4

Question 1

Which spanning tree protocol variant provides the fastest convergence time in a data center switching environment?

Accepted Answer

RSTP (802.1w)

Answer

RSTP (Rapid Spanning Tree Protocol) converges in seconds rather than the 30–50 seconds of classic STP, making it the fastest standard spanning tree variant.

Question 2

A data center uses ECMP (Equal-Cost Multi-Path) routing. What is the primary benefit of ECMP?

Accepted Answer

Allows traffic load sharing across multiple equal-cost paths

Answer

ECMP distributes traffic across multiple paths with the same routing metric, increasing aggregate bandwidth and providing redundancy.

Question 3

What is the purpose of a spine-and-leaf network topology in modern data centers?

Accepted Answer

To provide consistent low-latency east-west traffic between servers

Answer

Spine-and-leaf topology ensures every leaf switch is exactly two hops from any other leaf, providing predictable, low-latency east-west traffic for server-to-server communication.

Question 4

Which protocol is used to aggregate multiple physical network links into a single logical link for increased bandwidth and redundancy?

Accepted Answer

LACP (802.3ad)

Answer

LACP (Link Aggregation Control Protocol) per IEEE 802.3ad dynamically negotiates and manages link aggregation groups (LAGs) between switches and servers.

Question 5

In a data center context, what does 'oversubscription' mean in network design?

Accepted Answer

Having more downstream bandwidth capacity than upstream uplink capacity

Answer

Oversubscription is the ratio of total downstream port bandwidth to uplink bandwidth; a 4:1 ratio means four times more server-facing bandwidth than uplink capacity.

CDCP - Certified Data Centre Professional Practice Test

CDCP - Certified Data Centre Professional Practice Test

CDCP Network Infrastructure and Connectivity 4