Question about the /etc/hosts file

[L33T Networks]

What is the second line with 10.20.30.199, and the hostname ends in a
period? I've never seen this in a host file previous to FBSD v.6.

apollo# cat /etc/hosts
#::1                    localhost.mydomain.com localhost
127.0.0.1               localhost.mydomain.com localhost
10.20.30.199            apollo.mydomain.com apollo
10.20.30.199            apollo.mydomain.com.

Is this something that's required for other IP addresses that will be added
to the hosts file in the future?

Thanks in advance!

Chris