In this article, I will explain how we can stop access telnet by any host in a network. So stop telnet from accessing by a host of the network, I will use ACL. Why we would do that? I think you must think we want to block telnet for particular hosts or for a network. So friends block or deny hosts to access TELNET for security purposes. Yes, friends, we do this because we don’t want to give access to any unauthorized person to enter our system. So for safety reasons we filter the network traffic and allow some particular hosts to access telnet.