Ask HN: Understanding of networks is necessary for Web Developer?

Hi HN,

I'm a happy Web developer, who is good at front end technologies. I also know how a public private key works to make a secure connection on HTTPS.Fundas of OSI layer of networks.

Is understanding networks ( in depth each and every bit of protocol) is necessarily for a great web developer?

If not all networking concepts, what all network concepts do HN thinks its mandate for an Web Dev guy?

Thanks.