CDCP Network Infrastructure and Connectivity

Question 1

Which network topology is most commonly used within a data center to provide redundancy and high availability?

Accepted Answer

Fat-tree (spine-leaf) topology

Answer

The fat-tree (spine-leaf) topology is preferred in data centers because it provides multiple equal-cost paths, eliminating single points of failure and enabling non-blocking bandwidth.

Question 2

What is the primary purpose of a Top-of-Rack (ToR) switch in a data center?

Accepted Answer

To aggregate traffic from servers within a single rack before uplink to core switches

Answer

A ToR switch aggregates server connections within a rack and provides uplinks to distribution or spine-layer switches, reducing cable runs across the data floor.

Question 3

In data center networking, what does 'oversubscription ratio' refer to?

Accepted Answer

The ratio of total downstream bandwidth to available upstream bandwidth

Answer

Oversubscription ratio describes how much downstream port bandwidth is shared across limited upstream bandwidth, e.g., a 4:1 ratio means four times more downstream capacity than upstream.

Question 4

Which protocol is used to prevent Layer 2 switching loops in a data center network?

Accepted Answer

Spanning Tree Protocol (STP)

Answer

Spanning Tree Protocol (STP) and its variants (RSTP, MSTP) block redundant paths to prevent Layer 2 loops while maintaining failover capability.

Question 5

What is the recommended minimum fiber type for supporting 40GbE and 100GbE connections in modern data centers?

Accepted Answer

OM3 or OM4 multimode fiber

Answer

OM3 and OM4 multimode fibers support 40GbE and 100GbE at sufficient distances (100m for OM3, 150m for OM4) required within data center environments.

CDCP - Certified Data Centre Professional Practice Test

CDCP - Certified Data Centre Professional Practice Test

CDCP Network Infrastructure and Connectivity