Yes, absolutely. Some people will tell you differently, but they are wrong: networking is a core skill for sysadmins. If you aren’t really strong at networking, you absolutely cannot be a good sysadmin (or system engineer, or DevOps engineer, or whatever nom du jour they are rebranding it with today).
More than once I have been unable to promote one of my own team because they have refused to learn or get better at networking. That meant I cannot include these folks in many projects where networking is a core skill because they won’t be able to complete the necessary tasks without tons of outside help. I know networking ain’t easy. But I don’t (and they won’t) get paid 5x the median salary for doing shit that’s easy. If it were easy any mook off the street would be earning that much green.
Learn networking. It’s one of the few skills that’s quite future-proof and has a really great ROI.