Network redundancy (ring topology) in SCADA systems - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is network redundancy in the context of ring topology?

Network redundancy means having backup paths in a ring network so data can still travel if one connection breaks.

beginner

How does a ring topology provide fault tolerance?

In a ring topology, data can travel in both directions. If one link fails, data takes the other way around the ring to reach its destination.

beginner

Name one advantage of using ring topology for network redundancy.

It ensures continuous network operation by providing an alternate path, reducing downtime in case of a failure.

intermediate

What happens if two links fail simultaneously in a ring topology?

If two links fail at once, the ring breaks into segments and network communication may be lost between those segments.

beginner

Why is ring topology often used in SCADA systems for network redundancy?

Because SCADA systems need high reliability, ring topology helps keep communication stable even if one connection fails.

What is the main benefit of network redundancy in a ring topology?

A Eliminates the need for switches

B Reduces the number of devices needed

C Increases network speed by doubling connections

D Provides an alternate path if one link fails

Network redundancy in ring topology provides an alternate path for data if one link fails, ensuring continuous communication.

In a ring topology, data usually travels in which direction(s)?

A Only one direction

B Random directions

C Both directions

D No fixed direction

Data can travel in both directions in a ring topology, allowing rerouting if one path fails.

What is a risk if two links fail simultaneously in a ring topology?

A Network segments become isolated

B Network speed doubles

C All devices shut down automatically

D Data is lost permanently

Two simultaneous link failures can break the ring into isolated segments, disrupting communication.

Why is ring topology preferred in SCADA systems?

A It is the cheapest topology

B It provides high reliability and fault tolerance

C It requires no maintenance

D It uses wireless connections only

SCADA systems need reliable communication; ring topology offers fault tolerance by providing backup paths.

Which device is commonly used to connect nodes in a ring topology?

A Switch

B Router

C Hub

D Repeater

Switches are often used to connect nodes in a ring topology to manage data traffic efficiently.

Explain how network redundancy works in a ring topology and why it is important for SCADA systems.

Think about how a circle can still connect if one part breaks.

Describe what happens when a single link fails in a ring topology and how the network recovers.

Imagine traffic going around a roundabout the other way.