<s>
The	O
Quote	B-Protocol
of	I-Protocol
the	I-Protocol
Day	I-Protocol
(	O
QOTD	B-Protocol
)	O
service	O
is	O
a	O
member	O
of	O
the	O
Internet	B-Protocol
protocol	I-Protocol
suite	I-Protocol
,	O
defined	O
in	O
RFC	O
865	O
.	O
</s>
<s>
As	O
indicated	O
there	O
,	O
the	O
QOTD	B-Protocol
concept	O
predated	O
the	O
specification	O
,	O
when	O
QOTD	B-Protocol
was	O
used	O
by	O
mainframe	O
sysadmins	O
to	O
broadcast	O
a	O
daily	O
quote	O
on	O
request	O
by	O
a	O
user	O
.	O
</s>
<s>
A	O
host	O
may	O
connect	O
to	O
a	O
server	O
that	O
supports	O
the	O
QOTD	B-Protocol
protocol	O
,	O
on	O
either	O
TCP	B-Protocol
or	O
UDP	B-Protocol
port	O
17	O
.	O
</s>
<s>
Although	O
some	O
sources	O
indicate	O
that	O
the	O
QOTD	B-Protocol
service	O
is	O
rarely	O
enabled	O
,	O
and	O
is	O
in	O
any	O
case	O
often	O
firewalled	B-Application
to	O
avoid	O
denial-of-service	O
attacks	O
,	O
interest	O
continues	O
in	O
the	O
pre-existing	O
purpose	O
of	O
serving	O
quotes	O
as	O
can	O
be	O
seen	O
with	O
web	O
engine	O
searches	O
.	O
</s>
<s>
Current	O
testing	O
and	O
measurement	O
of	O
IP	B-Protocol
networks	I-Protocol
is	O
more	O
commonly	O
done	O
with	O
ping	B-Protocol
and	O
traceroute	B-Protocol
,	O
which	O
are	O
more	O
robust	O
adaptations	O
of	O
the	O
echo	B-Protocol
protocol	I-Protocol
(	O
RFC	O
862	O
)	O
,	O
which	O
predated	O
the	O
attempt	O
at	O
QOTD	B-Protocol
standardization	O
.	O
</s>
