<s>
Junos	B-Application
OS	I-Application
(	O
also	O
known	O
as	O
Juniper	B-Application
Junos	I-Application
,	O
Junos	B-Application
and	O
JUNOS	B-Application
)	O
is	O
a	O
FreeBSD-based	O
network	B-Protocol
operating	I-Protocol
system	I-Protocol
used	O
in	O
Juniper	O
Networks	O
routing	B-Protocol
,	O
switching	O
and	O
security	O
devices	O
.	O
</s>
<s>
Junos	B-Application
OS	I-Application
was	O
first	O
made	O
available	O
on	O
7	O
July	O
1998	O
,	O
with	O
new	O
feature	O
updates	O
being	O
released	O
every	O
quarter	O
2008	O
.	O
</s>
<s>
JUNOS	B-Application
Senior	O
Product	O
Manager	O
Michael	O
Bushong	O
attributed	O
the	O
release	O
speed	O
to	O
Juniper	O
's	O
strategic	O
decision	O
to	O
maintain	O
a	O
single	O
operating	O
system	O
across	O
routing	B-Protocol
and	O
switching	O
platforms	O
.	O
</s>
<s>
,	O
the	O
latest	O
version	O
is	O
Junos	B-Application
OS	I-Application
22.2	O
,	O
released	O
on	O
23	O
July	O
2022	O
.	O
</s>
<s>
Junos	B-Application
operating	O
system	O
is	O
primarily	O
based	O
on	O
Linux	B-Application
and	O
FreeBSD	B-Operating_System
,	O
with	O
Linux	B-Application
running	O
as	O
bare	O
metal	O
,	O
and	O
FreeBSD	B-Operating_System
running	O
in	O
a	O
QEMU	B-Application
Virtual	B-Architecture
machine	I-Architecture
.	O
</s>
<s>
Because	O
FreeBSD	B-Operating_System
is	O
a	O
Unix	B-Application
implementation	O
,	O
customers	O
can	O
access	O
a	O
Unix	B-Application
shell	O
and	O
execute	O
normal	O
Unix	B-Application
commands	O
.	O
</s>
<s>
Junos	B-Application
runs	O
on	O
most	O
or	O
all	O
Juniper	O
hardware	O
systems	O
.	O
</s>
<s>
After	O
Juniper	O
acquired	O
NetScreen	O
,	O
it	O
integrated	O
ScreenOS	O
security	O
functions	O
into	O
its	O
own	O
Junos	B-Application
network	B-Protocol
operating	I-Protocol
system	I-Protocol
.	O
</s>
<s>
Junos	B-Application
OS	I-Application
has	O
several	O
architecture	O
variations	O
:	O
</s>
<s>
Juniper	O
’s	O
flagship	O
Junos	B-Application
OS	I-Application
is	O
based	O
on	O
the	O
FreeBSD	B-Operating_System
operating	O
system	O
and	O
can	O
run	O
as	O
a	O
guest	O
virtual	B-Architecture
machine	I-Architecture
(	O
VM	O
)	O
on	O
a	O
Linux	B-Application
VM	O
host	O
.	O
</s>
<s>
Juniper	O
’s	O
next-generation	O
operating	O
system	O
,	O
Junos	B-Application
OS	I-Application
evolved	O
,	O
runs	O
native	O
Linux	B-Application
and	O
provides	O
direct	O
access	O
to	O
Linux	B-Application
utilities	O
and	O
operations	O
.	O
</s>
<s>
Both	O
operating	O
systems	O
use	O
the	O
same	O
command-line	B-Application
interface	I-Application
(	O
CLI	O
)	O
user	O
interface	O
,	O
the	O
same	O
applications	O
and	O
features	O
and	O
the	O
same	O
management	O
and	O
automation	O
tools	O
—	O
but	O
Junos	B-Application
OS	I-Application
evolved	O
infrastructure	O
has	O
been	O
entirely	O
modernized	O
to	O
enable	O
higher	O
availability	O
,	O
accelerated	O
deployment	O
,	O
greater	O
innovation	O
,	O
and	O
improved	O
operational	O
efficiencies	O
.	O
</s>
<s>
Through	O
the	O
Juniper	O
Developer	O
Network	O
(	O
JDN	O
)	O
Juniper	O
Networks	O
provides	O
the	O
Junos	B-Application
SDK	O
to	O
its	O
customers	O
and	O
3rd-party	O
developers	O
who	O
want	O
to	O
develop	O
applications	O
for	O
Junos-powered	O
devices	O
such	O
as	O
Juniper	O
Networks	O
routers	O
,	O
switches	O
,	O
and	O
service	O
gateway	O
systems	O
.	O
</s>
<s>
It	O
provides	O
a	O
set	O
of	O
tools	O
and	O
application	B-Application
programming	I-Application
interfaces	I-Application
(	O
APIs	B-Application
)	O
,	O
including	O
interfaces	O
to	O
Junos	B-Application
routing	B-Protocol
,	O
firewall	O
filter	O
,	O
UI	O
and	O
traffic	O
services	O
functions	O
.	O
</s>
<s>
Juniper	O
Networks	O
also	O
employs	O
the	O
Junos	B-Application
SDK	O
internally	O
to	O
develop	O
parts	O
of	O
Junos	B-Application
and	O
many	O
Junos	B-Application
applications	O
such	O
as	O
OpenFlow	B-Protocol
for	O
Junos	B-Application
,	O
and	O
other	O
traffic	O
services	O
.	O
</s>
<s>
The	O
Junos	B-Application
OS	I-Application
command-line	B-Application
interface	I-Application
(	O
CLI	O
)	O
is	O
a	O
text-based	O
command	O
interface	O
for	O
configuring	O
,	O
troubleshooting	O
,	O
and	O
monitoring	O
the	O
Juniper	O
device	O
and	O
network	O
traffic	O
associated	O
with	O
it	O
.	O
</s>
<s>
For	O
advanced	O
network	O
security	O
,	O
a	O
special	O
version	O
of	O
Junos	B-Application
OS	I-Application
called	O
Junos-FIPS	O
140-2	O
Security	O
Compliance	O
is	O
available	O
,	O
providing	O
customers	O
with	O
software	O
tools	O
to	O
configure	O
a	O
network	O
of	O
Juniper	O
Networks	O
devices	O
in	O
a	O
Federal	O
Information	O
Processing	O
Standards	O
(	O
FIPS	O
)	O
environment	O
.	O
</s>
<s>
Junos	B-Application
OS	I-Application
offers	O
programming	B-Application
interfaces	I-Application
and	O
the	O
Juniper	O
Extension	O
Toolkit	O
(	O
JET	O
)	O
for	O
developing	O
applications	O
that	O
unlock	O
more	O
value	O
from	O
the	O
network	O
.	O
</s>
<s>
JET	O
is	O
a	O
standard	O
component	O
of	O
Junos	B-Application
OS	I-Application
,	O
and	O
it	O
runs	O
on	O
all	O
Juniper	O
routers	O
,	O
switches	O
,	O
and	O
security	O
devices	O
.	O
</s>
<s>
JET	O
simplifies	O
the	O
automation	O
of	O
operational	O
,	O
configuration	O
,	O
and	O
management	O
tasks	O
,	O
providing	O
a	O
rich	O
set	O
of	O
open	O
and	O
customizable	O
APIs	B-Application
for	O
control	O
,	O
management	O
,	O
and	O
data	O
planes	O
.	O
</s>
<s>
It	O
supports	O
standardized	O
programming	O
languages	O
for	O
application	O
development	O
and	O
communication	O
to	O
the	O
Junos	B-Application
OS	I-Application
fast	O
programmable	O
database	O
through	O
standardized	O
and	O
open	O
data	O
exchange	O
formats	O
.	O
</s>
<s>
It	O
also	O
opens	O
up	O
Trio	O
and	O
Express	O
ASICs	O
via	O
a	O
set	O
of	O
third-party	O
controller-specific	O
adapters	O
,	O
including	O
SAI	O
,	O
OpenFlow	B-Protocol
,	O
and	O
P4	B-Language
.	O
</s>
<s>
Junos	B-Application
Fusion	O
helps	O
reduce	O
network	O
complexity	O
and	O
operational	O
expenses	O
by	O
enabling	O
multiple	O
distributed	O
devices	O
to	O
be	O
managed	O
as	O
a	O
single	O
,	O
logical	O
device	O
.	O
</s>
<s>
Two	O
different	O
Junos	B-Application
Fusion	O
architectures	O
are	O
available	O
,	O
one	O
for	O
provider	O
edge	O
and	O
one	O
for	O
enterprise	O
.	O
</s>
<s>
Node	O
slicing	O
is	O
a	O
Junos	B-Application
OS	I-Application
feature	O
that	O
enables	O
creating	O
multiple	O
partitions	O
from	O
one	O
physical	O
MX	O
Series	O
router	O
.	O
</s>
<s>
Junos	B-Application
OS	I-Application
supports	O
a	O
variety	O
of	O
routing	B-Protocol
protocols	I-Protocol
and	O
applications	O
.	O
</s>
<s>
It	O
also	O
supports	O
class	B-Device
of	I-Device
service	I-Device
(	O
CoS	O
)	O
,	O
Ethernet	B-Protocol
VPN	I-Protocol
(	O
EVPN	B-Protocol
)	O
,	O
firewall	O
filters	O
and	O
policers	O
,	O
flow	O
monitoring	O
,	O
and	O
Layer	O
2	O
features	O
.	O
</s>
<s>
It	O
's	O
a	O
flexible	O
routing	B-Protocol
policy	I-Protocol
language	O
that	O
is	O
used	O
for	O
controlling	O
route	O
advertisements	O
and	O
path	O
selection	O
.	O
</s>
<s>
Junos	B-Application
OS	I-Application
generally	O
adheres	O
to	O
industry	O
standards	O
for	O
routing	B-Protocol
and	O
Multiprotocol	B-Protocol
Label	I-Protocol
Switching	I-Protocol
(	O
MPLS	B-Protocol
)	O
.	O
</s>
<s>
The	O
Junos	B-Application
OS	I-Application
supports	O
high	O
availability	O
mechanisms	O
that	O
are	O
not	O
standard	O
to	O
Unix	B-Application
,	O
such	O
as	O
Graceful	O
Restart	O
.	O
</s>
<s>
Junos	B-Application
supports	O
a	O
variety	O
of	O
routing	B-Protocol
protocols	I-Protocol
.	O
</s>
<s>
With	O
the	O
introduction	O
of	O
the	O
SRX	O
and	O
J-series	O
(	O
past	O
version	O
9.3	O
)	O
platforms	O
,	O
it	O
also	O
supports	O
"	O
flow	O
mode	O
"	O
,	O
which	O
includes	O
stateful	O
firewalling	O
,	O
NAT	B-Protocol
,	O
and	O
IPsec	B-Protocol
.	O
</s>
<s>
Junos	B-Application
generally	O
adheres	O
to	O
industry	O
standards	O
for	O
routing	B-Protocol
and	O
MPLS	B-Protocol
.	O
</s>
<s>
Secure	O
boot	O
is	O
a	O
significant	O
system	O
security	O
enhancement	O
based	O
on	O
the	O
Unified	B-Architecture
Extensible	I-Architecture
Firmware	I-Architecture
Interface	I-Architecture
(	O
UEFI	B-Architecture
)	O
standard	O
.	O
</s>
<s>
It	O
works	O
by	O
safeguarding	O
the	O
Basic	B-Operating_System
Input/Output	I-Operating_System
System	I-Operating_System
(	O
BIOS	B-Operating_System
)	O
from	O
tampering	O
or	O
modification	O
and	O
then	O
maintaining	O
that	O
protection	O
throughout	O
the	O
boot	O
process	O
.	O
</s>
<s>
Authorized	O
releases	O
of	O
Junos	B-Application
OS	I-Application
carry	O
a	O
digital	O
signature	O
produced	O
by	O
either	O
Juniper	O
Networks	O
directly	O
or	O
one	O
of	O
its	O
authorized	O
partners	O
.	O
</s>
<s>
,	O
Juniper	O
maintains	O
a	O
market	O
share	O
in	O
Ethernet	O
Switching	O
of	O
16.9	O
%	O
and	O
a	O
market	O
share	O
in	O
Enterprise	O
Routing	B-Protocol
of	O
16.1	O
%	O
.	O
</s>
<s>
Juniper	O
generated	O
a	O
$	O
2,353	O
million	O
revenue	O
in	O
Routing	B-Protocol
,	O
$858	O
million	O
in	O
Switching	O
,	O
and	O
$318	O
million	O
in	O
Security	O
during	O
2016	O
.	O
</s>
<s>
Key	O
benefits	O
of	O
Junos	B-Application
OS	I-Application
,	O
as	O
advertised	O
by	O
Juniper	O
Networks	O
,	O
include	O
:	O
</s>
<s>
Single	O
train	O
compatibility	O
:	O
Every	O
Juniper	O
switch	O
,	O
router	O
,	O
or	O
other	O
product	O
runs	O
the	O
same	O
JUNOS	B-Application
system	O
.	O
</s>
