Open Ports on Obi202 - 23 53 80 ?

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ob202_learner:
I'm wondering why my Obi202 has all the open ports it does.   While the WAN-side port is connected to my other computers behind a router gateway, nmap shows me that the Obi202 has an open port 23 (telnet?),  53 (domain name server?), and 80 (an http server).

I understand the port 80 web server (remote web-GUI configuration, and all).  But why is there a DNS port open?  Or even telnet?

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