Operating Systems can be detected using Ping Command, Ping is a computer network administration software utility, which used to find the Availability of a host on an Internet Protocol (IP) network. TTL is simply meant, how long a resolver is supposed to cache the DNS query before the query expires and a new one needs to be done. Ping operates by sending Internet Control Message Protocol (ICMP) Echo Request packets to the target host and waiting for an ICMP Echo Reply.
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