Geting Clarity about Modularity

[gettofayoyiwajide]

What is modularity in network design?

(a) Ability to to create self-contained, repeatable sections of the network

(b) Ability to scale and accommodate future needs of the network

Hello Community, kindly help my understanding, I believe the answer to this question is option (a), option (b) to me is interpretd as scalability which is the ability of a resource to scale up or down to accomodate traffic requirement which premises on user's experience but again, I need some sort of stronger context or explanation to reinforce my conviction. 

[balaji.bandi]

Hope we are talking switch Modularity here :

Modular switches

Modular switches let you add expansion modules into the switches as needed, giving you flexibility if your network needs change. Examples of expansion modules are application-specific (such as firewall, wireless, or network analysis) and modules for additional interfaces, power supplies, or cooling fans.

if you looking switching example :

you can multple lines cards / multiple sup card for redundancy.

some example new Cat 9600 to help you understanding better :

https://www.cisco.com/c/en/us/products/collateral/switches/catalyst-9600-series-switches/nb-06-upgrading-cat-9600-fc-cte-en.html

[Joseph W. Doherty]

Do you have a reference to such in context to network design?

[gettofayoyiwajide]

Yes the context is in network design 

[Joseph W. Doherty]

Well, I did ask for some contextual reference, but perhaps that's exactly what you seek,

Found lots of references on this searching the Internet, Cisco's Enterprise Architecture, seems to use a modular design approach.

Some references:

https://www.ciscopress.com/articles/article.asp?p=2202410&seqNum=5
https://flylib.com/books/en/3.293.1.14/1/
https://networkdirection.net/articles/network-theory/modularnetworkdesign/
https://www.ccexpert.us/network-design/guidelines-for-creating-an-enterprise-network.html

See if any of those support your understanding, which I believe is basically correct.