If you've come across maps02.a-cdn.net and wondered whether it's safe, the short answer is that it looks like a technical accelerator node rather than a website you'd interact with directly. The domain uses a valid SSL certificate, enforces HTTPS, and has no history of blacklisting or malware reports — all good signs for an infrastructure server.
That said, there's almost no public information about who runs this service. The subdomain doesn't appear in the Wayback Machine, and there's no contact page or legal disclosures. For a CDN endpoint that's not unusual, but it does mean you can't easily verify the operator. If you were redirected here by another site or service, that site likely has a relationship with this CDN. If you landed here accidentally, it's harmless — just a 404 page.
To answer the question 'is maps02.a-cdn.net a scam', the evidence points to no. It's more likely a legitimate part of a content delivery network. The main thing to watch for is whether the site that sent you here is trustworthy. On its own, maps02.a-cdn.net poses little risk, but don't enter personal information on any page you reach through it without confirming the context first.