<s>
NetBoot	B-Device
was	O
a	O
technology	O
from	O
Apple	O
which	O
enabled	O
Macs	B-Device
with	O
capable	O
firmware	B-Application
(	O
i.e.	O
</s>
<s>
New	B-Device
World	I-Device
ROM	I-Device
)	O
to	O
boot	B-Operating_System
from	O
a	O
network	O
,	O
rather	O
than	O
a	O
local	O
hard	B-Device
disk	I-Device
or	O
optical	O
disc	O
drive	O
.	O
</s>
<s>
NetBoot	B-Device
is	O
a	O
derived	O
work	O
from	O
the	O
Bootstrap	B-Device
Protocol	I-Device
(	O
BOOTP	B-Device
)	O
,	O
and	O
is	O
similar	O
in	O
concept	O
to	O
the	O
Preboot	B-Device
Execution	I-Device
Environment	I-Device
.	O
</s>
<s>
The	O
technology	O
was	O
announced	O
as	O
a	O
part	O
of	O
the	O
original	B-Operating_System
version	I-Operating_System
of	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
Server	I-Operating_System
at	O
Macworld	O
Expo	O
on	O
5	O
January	O
1999	O
.	O
</s>
<s>
NetBoot	B-Device
has	O
continued	O
to	O
be	O
a	O
core	O
systems	B-Application
management	I-Application
technology	O
for	O
Apple	O
,	O
and	O
has	O
been	O
adapted	O
to	O
support	O
modern	O
Mac	B-Device
Intel	I-Device
machines	O
.	O
</s>
<s>
NetBoot	B-Device
,	O
USB	O
,	O
and	O
FireWire	O
are	O
some	O
of	O
the	O
external	O
volume	O
options	O
for	O
operating	O
system	O
re-install	O
.	O
</s>
<s>
NetBoot	B-Device
is	O
not	O
supported	O
on	O
newer	O
Macs	B-Device
with	O
T2	B-Device
security	I-Device
chip	I-Device
or	O
Apple	B-Device
silicon	I-Device
.	O
</s>
<s>
A	O
disk	B-Application
image	I-Application
with	O
a	O
copy	O
of	O
macOS	B-Application
,	O
macOS	B-Operating_System
Server	I-Operating_System
,	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
,	O
or	O
Mac	B-Operating_System
OS	I-Operating_System
8	I-Operating_System
is	O
created	O
using	O
System	B-Operating_System
Image	I-Operating_System
Utility	I-Operating_System
and	O
is	O
stored	O
on	O
a	O
server	O
,	O
typically	O
macOS	B-Operating_System
Server	I-Operating_System
.	O
</s>
<s>
Clients	O
receive	O
this	O
image	O
across	O
a	O
network	O
using	O
many	O
popular	O
protocols	O
including	O
:	O
HTTPS	B-Protocol
,	O
AFP	B-Protocol
,	O
TFTP	B-Device
,	O
NFS	B-Protocol
,	O
and	O
multicast	O
Apple	B-Operating_System
Software	I-Operating_System
Restore	I-Operating_System
(	O
ASR	B-Operating_System
)	O
.	O
</s>
<s>
Server-side	O
NetBoot	B-Device
image	O
can	O
boot	B-Operating_System
entire	O
machines	O
,	O
although	O
NetBoot	B-Device
is	O
more	O
commonly	O
used	O
for	O
operating	O
system	O
and	O
software	B-Application
deployment	I-Application
,	O
somewhat	O
similar	O
to	O
Norton	B-Application
Ghost	I-Application
.	O
</s>
<s>
Client	O
machines	O
first	O
request	O
network	O
configuration	O
information	O
through	O
DHCP	B-Protocol
,	O
then	O
a	O
list	O
of	O
boot	B-Operating_System
images	O
and	O
servers	O
with	O
BSDP	B-Device
and	O
then	O
proceed	O
to	O
download	O
images	O
with	O
protocols	O
mentioned	O
above	O
.	O
</s>
<s>
Both	O
Intel	O
and	O
PowerPC-based	O
servers	O
can	O
serve	O
images	O
for	O
Intel	O
and	O
PowerPC-based	O
clients	O
.	O
</s>
<s>
NetInstall	O
is	O
a	O
similar	O
feature	O
of	O
macOS	B-Operating_System
Server	I-Operating_System
which	O
utilizes	O
NetBoot	B-Device
and	O
ASR	B-Operating_System
to	O
deliver	O
installation	O
images	O
to	O
network	O
clients	O
(	O
typically	O
on	O
first	O
boot	B-Operating_System
)	O
.	O
</s>
<s>
Like	O
NetBoot	B-Device
,	O
NetInstall	O
images	O
can	O
be	O
created	O
using	O
the	O
System	B-Operating_System
Image	I-Operating_System
Utility	I-Operating_System
.	O
</s>
<s>
NetInstall	O
performs	O
a	O
function	O
for	O
macOS	B-Application
similar	O
to	O
Windows	O
Deployment	O
Services	O
for	O
Microsoft	O
clients	O
,	O
which	O
depend	O
on	O
the	O
Preboot	B-Device
Execution	I-Device
Environment	I-Device
.	O
</s>
<s>
Mac	O
OS	O
8.5	O
and	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
use	O
only	O
BOOTP/DHCP	O
to	O
get	O
IP	O
information	O
,	O
followed	O
by	O
a	O
TFTP	B-Device
transfer	O
of	O
the	O
Mac	B-Device
OS	I-Device
ROM	I-Device
file	B-General_Concept
.	O
</s>
<s>
Next	O
,	O
two	O
volumes	O
are	O
mounted	O
via	O
AppleTalk	B-Application
over	O
TCP	B-Protocol
on	O
which	O
the	O
client	O
disk	B-Application
images	I-Application
reside	O
.	O
</s>
<s>
All	O
in	O
all	O
,	O
the	O
Classic	B-Application
Mac	I-Application
OS	I-Application
uses	O
three	O
images	O
;	O
a	O
System	O
image	O
which	O
contains	O
the	O
operating	O
system	O
and	O
may	O
contain	O
applications	O
.	O
</s>
