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m
o
n
d
etec
tio
n
p
r
o
ce
s
s
es
im
p
r
ac
tical.
W
ith
o
u
t
th
eir
aid
,
th
er
e
is
a
n
ee
d
f
o
r
m
o
r
e
co
m
p
lex
f
r
a
m
ewo
r
k
s
th
at
wi
ll
em
b
r
ac
e
s
tatis
tical
m
o
d
eli
n
g
,
f
ea
tu
r
e
s
elec
tio
n
,
a
n
d
m
ac
h
in
e
lear
n
in
g
f
o
r
ef
f
ec
tiv
e
d
etec
tio
n
.
T
h
is
s
tu
d
y
b
r
in
g
s
to
th
e
f
o
r
e
th
e
im
p
o
r
tan
ce
o
f
th
e
Po
is
s
o
n
ar
r
iv
al
p
r
o
ce
s
s
in
m
o
d
elin
g
s
lo
wlo
r
is
attac
k
tr
af
f
ic.
T
h
e
co
m
b
in
atio
n
o
f
s
to
ch
asti
c
m
o
d
els,
f
ea
tu
r
e
s
elec
tio
n
alg
o
r
ith
m
s
,
an
d
m
ac
h
in
e
lear
n
in
g
h
a
s
b
ee
n
f
o
u
n
d
to
b
e
ef
f
ec
tiv
e
f
o
r
en
h
an
cin
g
th
e
d
etec
tio
n
an
d
class
if
ica
tio
n
o
f
s
lo
wlo
r
is
att
ac
k
s
.
R
esear
ch
er
s
s
tu
d
ied
an
ap
p
licatio
n
o
f
t
h
e
m
ac
h
in
e
lear
n
in
g
m
eth
o
d
s
to
d
etec
t
th
e
s
lo
wlo
r
is
attac
k
s
[
1
]
–
[
8
]
.
T
h
eir
wo
r
k
p
o
in
ted
o
u
t
t
h
e
d
is
ad
v
a
n
tag
es
o
f
th
e
s
tatic
th
r
esh
o
ld
-
b
a
s
ed
ap
p
r
o
ac
h
a
n
d
s
u
g
g
ested
a
d
y
n
am
ic
tr
a
f
f
ic
m
o
d
ellin
g
ap
p
r
o
ac
h
as
an
ef
f
ec
tiv
e
m
ea
n
s
to
d
is
tin
g
u
is
h
b
etwe
en
leg
itima
te
an
d
attac
k
tr
af
f
ic.
A
Po
is
s
o
n
b
ased
m
o
d
ellin
g
was
s
u
g
g
ested
to
b
e
a
b
le
to
b
etter
ca
p
tu
r
e
t
h
e
s
to
ch
asti
c
n
atu
r
e
o
f
th
e
att
ac
k
tr
af
f
ic
an
d
th
u
s
im
p
r
o
v
e
t
h
e
ac
cu
r
ac
y
o
f
th
e
d
etec
tio
n
s
y
s
tem
.
T
h
e
au
t
h
o
r
s
[
9
]
–
[
1
2
]
7
/2
8
/2
0
2
6
3
:0
3
:0
0
PM
in
tr
o
d
u
ce
s
a
d
e
ep
lear
n
i
n
g
f
r
am
ewo
r
k
f
o
r
th
e
r
ea
l
-
tim
e
d
etec
tio
n
an
d
m
itig
atio
n
o
f
D
Do
S
attac
k
s
in
an
s
o
f
twar
e
d
ef
in
ed
n
etwo
r
k
(
SDN)
-
en
ab
led
en
v
ir
o
n
m
en
t.
W
ith
ad
v
an
ce
d
tr
a
f
f
ic
an
aly
s
es
f
e
atu
r
e
em
p
lo
y
e
d
,
th
is
f
r
am
ew
o
r
k
ac
h
iev
es
h
ig
h
ac
cu
r
ac
y
with
lo
w
laten
cy
,
co
u
p
led
with
au
to
m
atic
m
itig
atio
n
s
tr
ateg
ies.
T
h
e
a
u
th
o
r
s
[
1
3
]
–
[
1
5
]
f
o
c
u
s
o
n
s
lo
w
HT
T
P/2
d
en
ial
o
f
s
er
v
ic
e
(
Do
S)
attac
k
s
,
as
th
e
au
th
o
r
s
o
f
th
e
s
tu
d
y
h
ig
h
lig
h
t
th
eir
p
o
ten
tial
f
o
r
ca
u
s
in
g
d
is
r
u
p
tio
n
g
iv
en
th
eir
f
ea
tu
r
es
with
in
th
e
p
r
o
to
c
o
l
its
elf
.
T
h
e
au
th
o
r
s
p
u
t
f
o
r
war
d
r
ea
l
-
tim
e
d
etec
tio
n
tech
n
iq
u
es
th
r
o
u
g
h
th
e
a
n
aly
s
is
o
f
an
ev
en
t
s
eq
u
en
ce
to
s
u
cc
ess
f
u
lly
m
itig
ate
th
ese
th
r
ea
ts
.
T
h
e
n
ee
d
f
o
r
ad
ap
tiv
e
s
ec
u
r
ity
in
ev
o
lv
in
g
attac
k
v
ec
to
r
s
is
u
n
d
er
lin
ed
in
th
e
s
tu
d
y
.
T
h
e
f
i
n
d
in
g
s
ca
ll
f
o
r
f
u
r
t
h
er
in
v
esti
g
atio
n
in
to
a
r
o
b
u
s
t
d
ef
en
s
e
m
ec
h
an
is
m
to
ad
d
r
ess
s
u
ch
v
u
ln
er
ab
ilit
ies
.
T
h
e
in
tellig
en
t
s
y
s
tem
f
o
r
s
lo
w
D
o
S
d
etec
tio
n
u
s
in
g
m
ac
h
in
e
lear
n
in
g
(
I
SS
DM
)
,
is
an
in
tellig
en
t
s
y
s
tem
th
at
s
u
p
p
o
r
ts
th
e
d
iag
n
o
s
is
an
d
m
itig
atio
n
o
f
s
lo
w
D
o
S
attac
k
s
,
in
p
ar
ticu
la
r
,
th
e
s
l
o
wlo
r
is
ty
p
e
with
in
SDNs
.
I
t
ac
q
u
ir
es
f
ea
tu
r
es
s
u
ch
as
r
esp
o
n
s
e
tim
es,
co
n
n
ec
tio
n
co
u
n
ts
,
tim
eo
u
ts
,
an
d
p
atter
n
m
atch
th
r
o
u
g
h
th
e
g
en
er
atio
n
o
f
tr
a
f
f
ic
d
ata
o
f
r
ea
l
-
wo
r
ld
c
o
n
f
ig
u
r
atio
n
s
b
u
ilt
u
p
o
n
th
e
s
etu
p
o
f
Ap
ac
h
e2
an
d
Ng
in
x
s
er
v
er
s
,
Z
o
d
iac
FX
Op
en
Flo
w
s
w
itc
h
,
an
d
th
e
R
y
u
co
n
tr
o
ller
.
T
h
e
d
y
n
am
ic
th
r
esh
o
l
d
v
alu
e
is
e
s
tim
ated
f
o
r
class
if
y
in
g
attac
k
s
with
Mo
n
te
C
ar
lo
s
im
u
latio
n
,
d
is
tin
g
u
i
s
h
in
g
leg
itima
te
f
r
o
m
attac
k
tr
af
f
ic
v
ia
h
ea
d
e
r
in
s
p
ec
tio
n
u
s
in
g
r
eg
u
lar
ex
p
r
ess
io
n
s
.
T
o
en
h
an
ce
d
etec
tio
n
ac
cu
r
ac
y
,
th
e
f
o
cu
s
s
elec
tio
n
in
teg
r
ates
b
len
d
ed
s
tatis
t
ical
an
d
in
f
o
r
m
ati
o
n
g
ain
(
B
SIG
)
,
wh
ich
c
h
o
o
s
e
s
th
e
m
o
s
t
r
elev
an
t
in
ter
v
i
ewe
d
f
ea
tu
r
es
f
o
r
class
if
icatio
n
.
W
h
en
p
u
t
th
r
o
u
g
h
s
ev
er
al
m
ac
h
in
e
a
n
d
d
ee
p
lear
n
in
g
m
o
d
els,
th
ese
f
ea
tu
r
es
lead
to
b
etter
d
etec
tio
n
p
e
r
f
o
r
m
an
ce
i
n
id
e
n
tify
in
g
s
lo
w
Do
S
attac
k
s
a
s
o
p
p
o
s
ed
to
m
o
r
e
tr
a
d
itio
n
al
f
ea
tu
r
e
s
elec
tio
n
m
eth
o
d
s
lik
e
i
n
f
o
r
m
atio
n
g
ain
,
T
-
test
,
an
d
C
h
i
-
s
q
u
ar
e.
T
h
i
s
s
u
r
v
ey
p
r
o
v
i
d
es
s
tr
o
n
g
j
u
s
tific
atio
n
f
o
r
th
e
f
ac
t
th
at
th
e
m
o
d
elin
g
a
n
d
d
etec
ti
n
g
o
f
lo
w
-
r
ate
DDo
S
attac
k
s
;
f
o
r
i
n
s
tan
ce
,
s
lo
wlo
r
is
is
d
is
tin
g
u
is
h
ed
b
y
a
wid
e
u
s
e
o
f
Po
is
s
o
n
ar
r
iv
al
p
r
o
ce
s
s
es
in
[
1
6
]
–
[
2
4
]
.
B
ein
g
s
tatis
tical
tr
af
f
ic
m
o
d
els,
alo
n
g
with
m
ac
h
i
n
e
lear
n
in
g
an
d
ad
v
an
ce
d
s
im
u
latio
n
tech
n
iq
u
es,
th
e
latter
wo
r
k
s
c
o
n
tr
ib
u
te
to
th
e
co
n
s
tr
u
cti
o
n
o
f
v
er
y
r
o
b
u
s
t
s
y
s
tem
s
th
at
co
u
ld
s
p
o
t stealth
y
attac
k
p
atter
n
s
in
d
y
n
am
ic
n
etwo
r
k
in
g
en
v
ir
o
n
m
en
ts
.
T
h
e
Po
is
s
o
n
d
is
tr
ib
u
tio
n
,
ex
t
en
s
iv
ely
u
tili
ze
d
in
th
e
a
n
aly
s
is
o
f
n
etwo
r
k
tr
af
f
ic,
is
m
at
h
em
atica
lly
g
r
o
u
n
d
ed
in
co
m
in
g
u
p
with
th
e
r
an
d
o
m
b
u
t
co
n
t
r
o
lled
ar
r
iv
al
p
atter
n
s
o
f
HT
T
P
r
eq
u
ests
g
en
er
ated
d
u
r
in
g
s
lo
wlo
r
is
attac
k
s
.
W
h
ile
leg
itima
te
tr
af
f
ic
m
i
g
h
t
ju
s
t
m
ain
tain
a
co
n
s
is
ten
t
p
atter
n
b
etwe
en
r
eq
u
ests
,
with
in
ter
-
ar
r
iv
al
tim
es
n
o
t
h
av
i
n
g
h
ig
h
v
ar
iab
ilit
y
,
t
h
e
Po
is
s
o
n
p
r
o
ce
s
s
in
tr
o
d
u
ce
s
v
ar
i
an
ce
s
th
at
im
itate
r
ea
l
-
wo
r
ld
r
an
d
o
m
n
ess
.
T
h
u
s
,
in
s
er
tin
g
t
h
is
ap
p
r
o
ac
h
in
to
th
e
d
etec
tio
n
f
r
am
ew
o
r
k
cr
ea
tes
r
ea
lis
tic
tr
af
f
ic
m
o
d
elin
g
a
n
d
later
ac
c
u
r
ate
tr
af
f
ic
an
aly
s
is
.
T
h
e
p
r
o
p
o
s
ed
f
r
am
ewo
r
k
co
m
p
r
is
es
o
f
th
r
ee
m
ajo
r
m
o
d
u
l
es.
T
h
r
o
u
g
h
th
e
d
ata
g
e
n
er
ati
o
n
m
o
d
u
le,
ce
r
tain
k
ey
s
er
v
e
r
p
ar
a
m
eter
s
,
in
clu
d
in
g
C
PU
u
s
ag
e,
m
em
o
r
y
u
tili
za
tio
n
,
an
d
n
etwo
r
k
th
r
o
u
g
h
p
u
t
alo
n
g
s
id
e
p
ac
k
et
in
ter
-
a
r
r
iv
al
tim
es,
a
r
e
m
o
n
ito
r
e
d
.
T
h
ese
p
ar
am
ete
r
s
ar
e
co
n
tin
u
o
u
s
ly
b
ein
g
an
aly
ze
d
an
d
an
o
m
alies
ar
e
d
etec
ted
th
r
o
u
g
h
s
o
m
e
th
r
esh
o
ld
s
u
s
in
g
Mo
n
te
C
ar
lo
s
im
u
latio
n
s
in
o
r
d
er
to
id
en
ti
f
y
d
e
v
iatio
n
s
f
r
o
m
n
o
r
m
al
s
er
v
er
b
eh
av
i
o
r
.
T
h
e
f
ea
tu
r
e
s
elec
tio
n
m
o
d
u
le,
with
th
e
h
elp
o
f
th
e
B
SIG
tech
n
iq
u
e,
ex
tr
ac
ts
th
e
m
o
s
t
r
elev
an
t
f
ea
t
u
r
es
f
o
r
class
if
icatio
n
s
u
ch
as
in
ter
-
ar
r
iv
al
t
im
e
v
ar
iab
ilit
y
,
p
ac
k
et
ar
r
iv
al
r
ates,
an
d
C
PU
u
tili
za
tio
n
th
at
ar
e
d
ir
ec
tly
in
f
lu
en
ce
d
b
y
t
h
e
Po
is
s
o
n
ar
r
iv
al
p
r
o
ce
s
s
.
T
h
e
tr
af
f
ic
class
if
icatio
n
m
o
d
u
le
m
a
k
es
u
s
e
o
f
s
ev
er
al
m
ac
h
in
e
lear
n
in
g
an
d
d
ee
p
lear
n
in
g
alg
o
r
ith
m
s
to
class
if
y
tr
af
f
ic
as
leg
i
tim
ate
o
r
attac
k
i
n
n
atu
r
e.
Fo
r
t
h
is
p
u
r
p
o
s
e,
s
u
p
p
o
r
t
v
ec
to
r
m
ac
h
i
n
e
(
SVM)
,
d
ec
is
io
n
tr
ee
(
DT
)
,
k
-
n
ea
r
est
n
eig
h
b
o
r
s
(
KNN)
,
r
an
d
o
m
f
o
r
est (
R
F),
n
aïv
e
B
ay
es (
NB
)
,
an
d
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ltil
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er
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tr
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(
ML
P)
alg
o
r
ith
m
s
ar
e
e
m
p
lo
y
ed
.
Evaluation Warning : The document was created with Spire.PDF for Python.
I
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2
2
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g
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etec
tio
n
ca
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ilit
ies
o
f
s
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s
o
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k
s
an
d
cr
ea
tes
a
s
ca
lab
le
an
d
s
y
s
tem
atic
m
eth
o
d
o
lo
g
y
to
ta
ck
le
s
im
ilar
ty
p
es
o
f
s
tealth
attac
k
s
.
T
h
e
en
v
is
ag
ed
ap
p
r
o
ac
h
p
r
o
m
is
es
h
ig
h
d
etec
tio
n
ac
cu
r
ac
ies
co
u
p
le
d
with
d
y
n
am
ic
n
etwo
r
k
ad
ap
tab
ilit
ies.
T
h
e
p
ap
er
ex
p
lain
s
th
e
d
esig
n
,
im
p
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en
tatio
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a
n
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al
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o
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r
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P
RO
P
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D
M
E
T
H
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DO
L
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G
Y
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h
e
m
eth
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p
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o
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ed
in
th
i
s
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ap
er
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a
m
o
d
if
ied
ap
p
r
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ac
h
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wo
r
k
p
r
esen
ted
in
[
2
5
]
ca
lled
"An
in
tellig
en
t
s
y
s
tem
f
o
r
s
lo
w
Do
S
d
etec
tio
n
u
s
in
g
m
ac
h
in
e
lear
n
in
g
-
Po
is
s
o
n
ar
r
iv
al
r
ate
-
b
ased
(
I
SS
DM
-
PA)
".
T
h
is
s
y
s
tem
is
d
esig
n
ed
to
d
etec
t
s
lo
w
Do
S
attac
k
s
g
en
er
ated
b
y
a
Po
is
s
o
n
ar
r
iv
al
p
r
o
ce
s
s
.
T
h
e
s
y
s
tem
co
n
s
is
ts
o
f
th
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ee
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ain
m
o
d
u
les
ca
lled
a
d
ata
g
en
er
atio
n
m
o
d
u
le;
f
ea
tu
r
e
s
el
ec
tio
n
m
o
d
u
le;
an
d
tr
af
f
ic
class
if
icatio
n
m
o
d
u
le.
Key
d
if
f
er
e
n
ce
s
in
th
e
m
o
d
if
ie
d
ap
p
r
o
ac
h
as f
o
llo
ws:
i)
Po
is
s
o
n
ar
r
iv
al
p
r
o
ce
s
s
in
teg
r
atio
n
:
th
e
Po
is
s
o
n
p
r
o
ce
s
s
is
ex
p
licitly
u
s
ed
to
m
o
d
el
a
ttack
tr
af
f
ic,
g
en
er
atin
g
r
an
d
o
m
ized
in
ter
-
a
r
r
iv
al
tim
es
f
o
r
HT
T
P
GE
T
r
e
q
u
ests
,
wh
ich
m
im
ics
th
e
s
tealth
y
b
eh
a
v
io
r
o
f
s
lo
w
Do
S a
ttack
s
.
ii)
Mo
n
te
C
ar
lo
s
im
u
latio
n
f
o
r
th
r
esh
o
ld
s
:
th
e
th
r
esh
o
ld
v
al
u
es
f
o
r
s
er
v
er
p
ar
am
eter
m
o
n
ito
r
i
n
g
ar
e
d
e
r
iv
e
d
u
s
in
g
Mo
n
te
C
ar
lo
s
im
u
latio
n
to
p
r
ed
ict
th
e
n
o
r
m
al
b
eh
av
io
r
o
f
th
e
s
er
v
er
u
n
d
er
th
e
in
f
lu
en
ce
o
f
Po
is
s
o
n
-
g
en
er
ated
attac
k
tr
a
f
f
i
c.
iii)
Po
is
s
o
n
-
r
elate
d
f
ea
tu
r
es:
th
e
in
ter
-
ar
r
i
v
al
tim
es
an
d
r
ate
o
f
p
ac
k
et
ar
r
iv
als
—
wh
ich
ar
e
co
r
e
ch
ar
ac
ter
is
tics
o
f
a
Po
is
s
o
n
p
r
o
ce
s
s
—
ar
e
co
n
s
id
er
ed
k
ey
f
ea
tu
r
es
in
d
etec
tin
g
s
lo
w
Do
S
at
tack
s
,
an
d
ar
e
s
elec
ted
v
ia
th
e
B
SIG
m
eth
o
d
.
iv
)
Po
is
s
o
n
-
awa
r
e
class
if
icatio
n
:
th
e
m
ac
h
in
e
lear
n
in
g
m
o
d
el
s
ar
e
tr
ain
ed
to
id
en
tify
attac
k
tr
af
f
ic
th
a
t
ex
h
ib
its
Po
is
s
o
n
-
lik
e
ch
ar
ac
te
r
is
tics
,
en
s
u
r
in
g
th
at
th
e
s
y
s
tem
ca
n
ef
f
ec
tiv
el
y
d
etec
t
atta
ck
s
g
en
er
ated
with
a
Po
is
s
o
n
ar
r
iv
al
r
ate.
2
.
1
.
P
o
is
s
o
n a
rr
iv
a
l pro
ce
s
s
T
h
e
Po
is
s
o
n
ar
r
iv
al
p
r
o
ce
s
s
i
s
a
m
ath
em
atica
l
m
o
d
el
u
s
ed
to
d
escr
ib
e
i
n
d
ep
e
n
d
en
t
r
an
d
o
m
ev
e
n
ts
h
ap
p
en
i
n
g
at
a
c
o
n
s
tan
t
av
e
r
ag
e
r
ate.
T
h
e
p
r
o
ce
s
s
is
f
o
r
m
ally
d
ef
i
n
ed
b
y
th
e
Po
is
s
o
n
d
is
tr
ib
u
tio
n
f
o
r
th
e
n
u
m
b
er
o
f
ev
en
ts
d
u
r
in
g
a
f
ix
ed
tim
e
in
ter
v
al
an
d
th
e
ex
p
o
n
en
tial d
is
tr
ib
u
tio
n
f
o
r
th
e
tim
e
b
etwe
en
ev
en
ts
.
I
ts
p
r
o
p
er
ties
in
clu
d
e
in
d
e
p
en
d
e
n
t
in
cr
em
en
ts
,
s
tatio
n
ar
y
in
c
r
em
en
ts
,
an
d
a
m
em
o
r
y
less
in
ter
-
ar
r
iv
al
tim
e
d
is
tr
ib
u
tio
n
.
T
h
e
Po
is
s
o
n
p
r
o
ce
s
s
is
wid
ely
u
s
ed
in
f
ield
s
l
ik
e
q
u
eu
ein
g
th
e
o
r
y
,
telec
o
m
m
u
n
icatio
n
s
,
tr
af
f
ic
en
g
in
ee
r
in
g
,
an
d
r
eliab
ilit
y
an
aly
s
is
.
A
Po
is
s
o
n
p
r
o
ce
s
s
is
a
s
to
ch
asti
c
p
r
o
ce
s
s
th
at
m
o
d
els
ev
en
ts
h
ap
p
en
i
n
g
r
a
n
d
o
m
ly
o
v
er
tim
e
o
r
s
p
ac
e
u
n
d
er
ce
r
tain
co
n
d
itio
n
s
.
T
h
e
k
ey
ass
u
m
p
tio
n
s
o
f
a
Po
is
s
o
n
p
r
o
ce
s
s
ar
e
f
o
llo
ws
:
i)
E
v
en
ts
ar
e
in
d
e
p
en
d
e
n
t:
th
e
o
cc
u
r
r
en
ce
o
f
o
n
e
ev
e
n
t
d
o
es
n
o
t
af
f
ec
t
th
e
p
r
o
b
a
b
ilit
y
o
f
th
e
o
cc
u
r
r
e
n
ce
o
f
an
o
th
er
e
v
en
t.
ii)
Statio
n
ar
ity
:
th
e
r
ate
o
f
o
cc
u
r
r
en
ce
o
f
e
v
en
ts
is
co
n
s
tan
t o
v
er
tim
e
(
i.e
.
,
th
e
a
r
r
iv
al
r
ate
d
o
es
n
o
t c
h
a
n
g
e)
.
iii)
No
s
im
u
ltan
eo
u
s
ev
e
n
ts
:
th
e
p
r
o
ce
s
s
ass
u
m
es
th
at
two
ev
e
n
ts
ca
n
n
o
t
o
cc
u
r
at
t
h
e
ex
ac
t
s
am
e
in
s
tan
t
(
alth
o
u
g
h
in
r
ea
l lif
e,
ex
tr
em
el
y
clo
s
e
ev
en
ts
ca
n
h
ap
p
e
n
)
.
iv
)
Me
m
o
r
y
less
p
r
o
p
er
ty
:
th
e
tim
e
u
n
til
th
e
n
ex
t
ev
en
t
o
cc
u
r
s
is
in
d
ep
e
n
d
en
t
o
f
th
e
tim
e
s
in
ce
th
e
last
ev
en
t.
T
h
e
Po
is
s
o
n
p
r
o
ce
s
s
is
ch
ar
ac
ter
ized
b
y
a
r
ate
p
ar
am
eter
(
d
en
o
ted
b
y
λ
)
wh
ich
d
ef
in
es
th
e
ex
p
ec
ted
n
u
m
b
e
r
o
f
ev
en
ts
p
e
r
u
n
it tim
e.
T
h
is
r
ate
is
o
f
ten
r
ef
er
r
ed
to
as th
e
P
o
is
s
o
n
ar
r
iv
al
r
ate.
2
.
2
.
P
o
is
s
o
n a
rr
iv
a
l r
a
t
e
:
ma
t
hem
a
t
ic
a
l f
o
r
m
ula
t
io
n
L
et
N(
t)
d
en
o
te
th
e
n
u
m
b
er
o
f
ev
en
ts
o
cc
u
r
r
in
g
u
p
to
tim
e
t
in
a
Po
i
s
s
o
n
p
r
o
ce
s
s
with
r
ate
λ
.
T
h
e
d
is
tr
ib
u
tio
n
o
f
N(
t)
f
o
ll
o
ws a
Po
is
s
o
n
d
is
tr
ib
u
tio
n
an
d
is
g
i
v
en
b
y
(
1
)
.
(
(
)
=
)
=
(
⋋
)
−
⋋
!
(
1
)
Wh
er
e
λ
is
th
e
ar
r
iv
al
r
ate,
r
ep
r
esen
tin
g
th
e
av
e
r
ag
e
n
u
m
b
er
o
f
ev
e
n
ts
p
er
u
n
it
tim
e
;
is
th
e
tim
e
p
er
io
d
co
n
s
id
er
ed
;
is
th
e
n
u
m
b
er
o
f
ev
en
ts
th
at
o
cc
u
r
r
ed
d
u
r
i
n
g
th
e
tim
e
p
er
io
d
;
an
d
e
is
E
u
ler
’
s
n
u
m
b
er
(
ap
p
r
o
x
im
ately
2
.
7
1
8
)
.
T
h
e
m
ea
n
(
ex
p
ec
te
d
v
alu
e
)
n
u
m
b
er
o
f
ev
en
ts
o
cc
u
r
r
in
g
in
a
tim
e
i
n
ter
v
al
t is as in
(
2
)
.
[
(
)
]
=
(
2
)
Evaluation Warning : The document was created with Spire.PDF for Python.
I
n
t J Ar
tif
I
n
tell
I
SS
N:
2252
-
8
9
3
8
Utiliz
in
g
p
o
is
s
o
n
mo
d
elin
g
a
n
d
a
d
va
n
ce
d
ma
c
h
in
e
lea
r
n
in
g
tech
n
iq
u
es fo
r
… (
P
r
a
th
ima
M
a
b
el
Jo
h
n
)
3157
T
h
e
v
ar
ian
ce
o
f
N(
t)
is
also
as in
(
3
)
.
(
(
)
)
=
(
3
)
2
.
3
.
K
ey
pro
pert
ies o
f
t
he
P
o
is
s
o
n
pro
ce
s
s
T
h
e
k
ey
p
r
o
p
er
ties
o
f
Po
is
s
o
n
p
r
o
ce
s
s
ar
e
as d
escr
ib
ed
as f
o
llo
ws
.
i)
I
n
ter
-
ar
r
i
v
al
t
im
es:
th
e
tim
es
b
etwe
en
co
n
s
ec
u
tiv
e
ev
e
n
ts
in
a
Po
is
s
o
n
p
r
o
ce
s
s
f
o
llo
w
a
n
ex
p
o
n
en
tial
d
is
tr
ib
u
tio
n
with
p
ar
am
eter
λ
,
wh
er
e
th
e
p
r
o
b
ab
ilit
y
th
at
th
e
tim
e
b
etwe
en
e
v
en
ts
is
g
r
ea
ter
th
an
s
o
m
e
v
alu
e
t is
(
4
)
.
(
>
)
=
−
⋋
(
4
)
T
h
e
ex
p
ec
ted
tim
e
b
etwe
en
e
v
en
ts
(
m
ea
n
in
ter
-
a
r
r
iv
al
tim
e)
i
s
1
/λ
.
ii)
I
n
cr
em
en
t
i
n
d
ep
en
d
en
ce
:
th
e
n
u
m
b
er
o
f
ev
en
ts
o
cc
u
r
r
in
g
i
n
d
is
jo
in
t
tim
e
in
ter
v
als
ar
e
i
n
d
ep
en
d
en
t
o
f
ea
ch
o
th
e
r
.
Fo
r
ex
a
m
p
le,
th
e
n
u
m
b
er
o
f
ev
e
n
ts
th
at
o
cc
u
r
f
r
o
m
tim
e
0
to
1
0
s
ec
o
n
d
s
is
i
n
d
ep
en
d
en
t
o
f
th
e
n
u
m
b
er
o
f
ev
en
ts
th
at
o
cc
u
r
f
r
o
m
tim
e
1
0
to
2
0
s
ec
o
n
d
s
.
iii)
Po
is
s
o
n
d
is
tr
ib
u
tio
n
o
f
e
v
e
n
t
s
:
th
e
n
u
m
b
er
o
f
ev
en
ts
o
cc
u
r
r
in
g
i
n
a
f
ix
ed
tim
e
i
n
ter
v
al
t
f
o
llo
ws
a
Po
is
s
o
n
d
is
tr
ib
u
tio
n
,
wh
ich
m
ea
n
s
th
at
‘t
h
e
p
r
o
b
a
b
ilit
y
o
f
o
b
s
er
v
in
g
e
x
ac
tly
k
e
v
en
ts
in
ti
m
e
t
is
g
iv
en
b
y
(
1
)
’
.
2
.
4
.
P
o
is
s
o
n
a
rr
iv
a
l pro
ce
s
s
in net
wo
rk
s
T
h
e
Po
is
s
o
n
ar
r
iv
al
p
r
o
ce
s
s
in
n
etwo
r
k
i
n
g
is
a
s
to
ch
asti
c
(
r
an
d
o
m
)
m
o
d
el
wh
er
e
p
ac
k
e
ts
o
r
d
ata
u
n
its
ar
r
iv
e
at
a
n
etwo
r
k
n
o
d
e
(
e.
g
.
,
a
r
o
u
ter
,
s
witch
,
o
r
s
er
v
er
)
at
a
r
ate
th
at
is
co
n
s
tan
t
o
n
a
v
er
ag
e.
T
h
e
ar
r
iv
al
tim
es
o
f
p
ac
k
ets
ar
e
in
d
ep
en
d
e
n
t
o
f
ea
c
h
o
th
e
r
,
an
d
th
e
n
u
m
b
e
r
o
f
p
ac
k
ets
ar
r
iv
i
n
g
with
in
an
y
f
ix
ed
tim
e
p
er
io
d
f
o
llo
ws a
Po
is
s
o
n
d
is
tr
ib
u
tio
n
.
i)
Ar
r
iv
al
r
ate
(
λ
)
:
th
e
Po
is
s
o
n
ar
r
iv
al
r
ate
λ
r
ep
r
esen
ts
th
e
av
er
ag
e
n
u
m
b
er
o
f
p
ac
k
ets
ar
r
iv
in
g
p
er
u
n
it
tim
e
(
e.
g
.
,
p
ac
k
ets p
er
s
ec
o
n
d
)
.
ii)
I
n
ter
-
ar
r
i
v
al
t
im
e:
th
e
tim
e
b
etwe
en
co
n
s
ec
u
tiv
e
p
ac
k
et
ar
r
iv
als
f
o
llo
ws
an
e
x
p
o
n
en
tial
d
is
tr
ib
u
tio
n
,
m
ea
n
in
g
th
at
t
h
e
tim
e
b
etwe
en
an
y
two
co
n
s
ec
u
tiv
e
ar
r
i
v
als is
m
em
o
r
y
less
.
I
n
m
ath
em
atica
l
ter
m
s
,
if
th
e
n
u
m
b
er
o
f
p
ac
k
ets
ar
r
iv
in
g
i
n
tim
e
t
is
d
en
o
ted
as
N(
t)
,
t
h
en
th
e
n
u
m
b
er
o
f
p
ac
k
ets
ar
r
iv
in
g
f
o
llo
ws
a
Po
is
s
o
n
d
is
tr
ib
u
tio
n
is
g
iv
en
b
y
(
1
)
.
T
h
e
ex
p
o
n
en
tial
in
ter
-
a
r
r
iv
al
tim
e
b
etwe
en
p
ac
k
ets is
g
iv
en
b
y
(
4
)
.
2
.
4
.
1
.
Slo
wlo
ris
a
t
t
a
c
k
a
nd
P
o
is
s
o
n
a
rr
iv
a
l r
a
t
e
T
h
e
s
lo
wlo
r
is
attac
k
is
a
f
o
r
m
o
f
Do
S
attac
k
d
esig
n
e
d
to
tar
g
et
web
s
er
v
er
s
,
s
p
ec
if
ically
e
x
p
lo
itin
g
h
o
w
HT
T
P
co
n
n
ec
tio
n
s
ar
e
h
a
n
d
led
b
y
th
e
s
er
v
er
.
T
h
is
attac
k
wo
r
k
s
b
y
k
ee
p
in
g
co
n
n
ec
tio
n
s
to
a
s
er
v
er
o
p
e
n
f
o
r
as
lo
n
g
as
p
o
s
s
ib
le
an
d
s
en
d
in
g
d
ata
ex
tr
e
m
ely
s
lo
wly
,
p
r
ev
e
n
tin
g
th
e
s
er
v
er
f
r
o
m
clo
s
in
g
th
o
s
e
co
n
n
ec
tio
n
s
,
ev
en
t
u
ally
ex
h
au
s
tin
g
its
r
e
s
o
u
r
ce
s
an
d
ca
u
s
in
g
it
to
b
ec
o
m
e
u
n
r
esp
o
n
s
iv
e.
T
h
e
Po
is
s
o
n
ar
r
iv
al
r
ate
co
m
es
in
to
p
lay
in
m
o
d
elin
g
h
o
w
th
e
attac
k
er
ca
n
g
en
er
ate
r
e
q
u
ests
in
a
s
ee
m
i
n
g
ly
"r
a
n
d
o
m
"
b
u
t
co
n
tr
o
lled
m
an
n
er
,
m
im
ick
in
g
th
e
b
e
h
av
io
r
o
f
le
g
itima
te
tr
af
f
ic
b
u
t
at
an
in
ten
tio
n
ally
s
lo
w
p
ac
e,
m
ak
in
g
d
etec
tio
n
d
if
f
ic
u
lt.
2
.
4
.
2
.
H
o
w
P
o
is
s
o
n
a
rr
iv
a
l r
a
t
e
f
it
s
wit
h sl
o
wlo
ris
T
h
e
Po
is
s
o
n
ar
r
iv
al
r
ate
ca
n
b
e
u
s
ed
t
o
m
o
d
el
t
h
e
r
ate
at
wh
ich
r
eq
u
ests
ar
e
s
en
t d
u
r
in
g
t
h
e
s
lo
wlo
r
is
attac
k
.
A
Po
is
s
o
n
p
r
o
ce
s
s
is
a
r
an
d
o
m
p
r
o
ce
s
s
wh
er
e
e
v
e
n
ts
(
in
t
h
is
ca
s
e,
HT
T
P
r
eq
u
e
s
ts
o
r
ch
u
n
k
s
o
f
an
HT
T
P
r
eq
u
est)
o
cc
u
r
in
d
ep
e
n
d
en
tly
o
v
er
tim
e,
at
a
co
n
s
tan
t
av
er
ag
e
r
ate
λ
.
I
n
th
e
co
n
tex
t
o
f
th
e
s
lo
wlo
r
is
attac
k
as f
o
llo
ws:
i)
T
h
e
attac
k
er
ca
n
g
e
n
er
ate
r
e
q
u
ests
o
r
d
ata
ch
u
n
k
s
with
a
Po
is
s
o
n
ar
r
iv
al
r
ate.
T
h
is
m
ea
n
s
th
e
attac
k
er
is
s
en
d
in
g
d
ata
(
e.
g
.
,
HT
T
P
r
eq
u
est
h
ea
d
er
s
o
r
p
ar
tial
d
ata)
at
a
r
ate
d
eter
m
in
ed
b
y
a
Po
is
s
o
n
d
is
tr
ib
u
tio
n
,
wh
er
e
th
e
av
e
r
ag
e
n
u
m
b
er
o
f
p
ac
k
ets s
en
t p
er
u
n
it o
f
tim
e
is
λ
.
ii)
T
h
e
ex
p
o
n
en
tial
in
ter
-
ar
r
i
v
al
tim
es
b
etwe
en
r
eq
u
ests
ar
e
a
ch
ar
ac
ter
is
tic
o
f
th
e
Po
is
s
o
n
p
r
o
ce
s
s
.
T
h
is
im
p
o
s
es
an
attac
k
er
m
o
d
el
wh
ich
s
en
d
s
s
lo
w,
p
er
io
d
ic,
an
d
u
n
p
r
e
d
ictab
le
r
eq
u
ests
,
m
ak
in
g
th
e
attac
k
less
lik
ely
to
b
e
d
etec
ted
in
c
o
m
p
ar
is
o
n
to
a
co
n
s
tan
t
-
r
ate
att
ac
k
.
2
.
5
.
P
o
is
s
o
n
pro
ce
s
s
a
nd
i
nte
r
-
a
rr
iv
a
l t
i
m
es
I
n
a
Po
is
s
o
n
p
r
o
ce
s
s
,
th
e
i
n
ter
-
ar
r
iv
al
tim
e
g
en
er
ally
f
o
llo
ws
an
e
x
p
o
n
en
tial
d
is
tr
i
b
u
tio
n
an
d
d
escr
ib
es
th
e
tim
e
f
o
r
s
en
d
i
n
g
p
ac
k
et
r
e
q
u
ests
o
n
e
af
ter
an
o
th
er
.
T
h
is
is
im
p
o
r
tan
t
wh
en
m
o
d
elin
g
th
e
"r
an
d
o
m
"
y
et
co
n
tr
o
lled
n
atu
r
e
o
f
s
lo
wlo
r
is
.
I
f
th
e
Po
is
s
o
n
ar
r
iv
al
r
ate
is
λ
(
p
ac
k
ets
p
e
r
s
ec
o
n
d
)
,
th
e
tim
e
b
etwe
en
s
en
d
in
g
two
r
eq
u
ests
is
ex
p
o
n
en
tially
d
is
tr
ib
u
te
d
with
th
e
p
r
o
b
ab
ilit
y
d
e
n
s
ity
f
u
n
c
tio
n
:
Evaluation Warning : The document was created with Spire.PDF for Python.
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2
2
5
2
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8
9
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8
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t J Ar
tif
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tell
,
Vo
l.
1
5
,
No
.
4
,
Au
g
u
s
t 2
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2
6
:
3
1
5
4
-
3
1
6
3
3158
P
(
T
>
)
=
−
⋋
W
h
er
e
is
th
e
in
ter
-
ar
r
iv
al
tim
e
(
tim
e
b
etwe
en
two
p
ac
k
ets),
is
tim
e
we’
r
e
in
ter
ested
in
(
e.
g
.
,
tim
e
u
n
til
th
e
n
ex
t c
h
u
n
k
is
s
en
t)
,
an
d
λ
is
av
er
ag
e
r
ate
at
w
h
ich
th
e
attac
k
er
s
en
d
s
p
ac
k
ets (
ch
u
n
k
s
o
f
an
HT
T
P r
eq
u
est).
Fo
r
ex
am
p
le,
if
th
e
attac
k
er
s
ets
a
Po
i
s
s
o
n
ar
r
iv
al
r
ate
o
f
0
.
1
p
ac
k
ets
p
er
s
ec
o
n
d
(
i.e
.
,
o
n
e
p
ac
k
et
ev
er
y
1
0
s
ec
o
n
d
s
o
n
a
v
er
ag
e
)
,
th
e
in
ter
-
ar
r
i
v
al
tim
e
b
etwe
en
p
ac
k
ets
will
f
o
llo
w
an
ex
p
o
n
en
tial
d
is
tr
ib
u
tio
n
with
λ
=0
.
1
.
T
h
is
m
ea
n
s
th
at
s
o
m
e
r
eq
u
ests
m
ay
b
e
s
en
t
q
u
ick
ly
(
with
a
v
er
y
s
h
o
r
t
in
ter
-
a
r
r
iv
al
tim
e)
,
wh
ile
o
th
er
s
will
b
e
s
en
t
with
a
lo
n
g
er
g
a
p
b
etwe
en
th
em
.
T
h
e
o
v
er
all
b
eh
a
v
io
r
,
h
o
wev
er
,
will
s
till
m
ain
tain
an
av
er
ag
e
ar
r
iv
al
r
ate
o
f
λ
.
2
.
6
.
Slo
wlo
ris wit
h
P
o
is
s
o
n
a
rr
iv
a
l r
a
t
e
:
a
t
t
a
c
k
mo
del
C
o
n
s
id
er
an
attac
k
er
tar
g
etin
g
a
web
s
er
v
er
.
T
h
e
attac
k
er
g
en
er
ates
N
s
im
u
ltan
eo
u
s
co
n
n
ec
tio
n
s
to
th
e
s
er
v
er
a
n
d
u
s
es
th
e
Po
is
s
o
n
ar
r
iv
al
r
ate
to
c
o
n
tr
o
l
h
o
w
f
r
eq
u
en
tly
th
e
attac
k
er
s
en
d
s
s
m
all
ch
u
n
k
s
o
f
d
ata
o
n
ea
ch
c
o
n
n
ec
tio
n
.
L
et’
s
m
o
d
el
th
e
attac
k
er
’
s
b
e
h
av
io
r
as f
o
llo
ws
:
i)
C
o
n
n
ec
tio
n
s
etu
p
:
t
h
e
attac
k
e
r
o
p
e
n
s
N
co
n
n
ec
tio
n
s
to
th
e
web
s
er
v
er
,
o
n
e
f
o
r
ea
ch
attac
k
th
r
ea
d
.
T
h
e
n
u
m
b
er
o
f
c
o
n
n
ec
tio
n
s
N
d
ep
e
n
d
s
o
n
th
e
s
er
v
er
'
s
m
ax
im
u
m
allo
wed
co
n
n
ec
tio
n
s
.
ii)
Data
ar
r
iv
al
r
ate:
th
e
attac
k
er
s
en
d
s
d
ata
(
ch
u
n
k
s
o
f
th
e
HT
T
P
r
eq
u
est)
at
a
Po
is
s
o
n
ar
r
iv
al
r
ate
λ
.
T
h
is
m
ea
n
s
th
at
th
e
tim
e
b
etwe
en
s
en
d
in
g
ea
c
h
n
ew
ch
u
n
k
f
o
llo
ws
an
ex
p
o
n
e
n
tial
d
is
tr
ib
u
tio
n
.
T
h
e
attac
k
er
d
o
esn
'
t
f
lo
o
d
t
h
e
s
er
v
er
with
a
co
n
s
tan
t
s
tr
ea
m
o
f
d
ata;
i
n
s
tead
,
th
e
c
h
u
n
k
s
ar
r
iv
e
at
a
v
ar
iab
le
r
ate,
wh
ich
o
n
a
v
er
ag
e
is
λ
.
iii)
R
eq
u
est
p
ar
t
ializati
on
:
in
s
tead
o
f
s
en
d
in
g
th
e
f
u
ll
HT
T
P
r
eq
u
est
at
o
n
ce
,
th
e
attac
k
er
s
en
d
s
th
e
h
ea
d
er
s
o
f
th
e
HT
T
P
r
eq
u
est
in
v
er
y
s
m
all
ch
u
n
k
s
,
s
p
ac
ed
o
u
t
with
an
ex
p
o
n
e
n
tial
in
ter
-
ar
r
i
v
al
tim
e
b
ased
o
n
th
e
Po
is
s
o
n
r
ate.
iv
)
Kee
p
aliv
e
c
o
n
n
ec
tio
n
s
:
ea
ch
in
co
m
p
lete
r
eq
u
est
k
ee
p
s
th
e
co
n
n
ec
tio
n
aliv
e
b
y
p
e
r
io
d
i
ca
lly
s
en
d
in
g
s
m
all
ch
u
n
k
s
.
Sin
ce
th
e
ch
u
n
k
s
ar
r
iv
e
r
an
d
o
m
ly
b
u
t
at
a
s
tead
y
av
er
ag
e
r
ate,
th
e
s
er
v
er
ca
n
n
o
t
ea
s
ily
d
is
tin
g
u
is
h
th
is
attac
k
f
r
o
m
le
g
itima
te
tr
af
f
ic.
v)
Ser
v
er
ex
h
au
s
tio
n
:
o
v
er
tim
e
,
th
e
s
er
v
er
’
s
c
o
n
n
ec
tio
n
p
o
o
l
will
f
ill
u
p
.
I
f
th
e
s
er
v
er
h
as
a
lim
it
o
f
1
0
0
co
n
cu
r
r
en
t
co
n
n
ec
tio
n
s
,
a
n
d
th
e
attac
k
er
u
s
es
1
0
0
c
o
n
n
ec
tio
n
s
with
a
Po
is
s
o
n
r
ate
o
f
λ
=0
.
1
r
eq
u
ests
p
er
s
ec
o
n
d
,
it
will
tak
e
an
av
e
r
ag
e
o
f
1
0
s
ec
o
n
d
s
to
s
en
d
a
s
in
g
le
ch
u
n
k
to
ea
ch
o
f
th
e
1
0
0
co
n
n
ec
tio
n
s
.
Ho
wev
er
,
as
lo
n
g
as
th
e
attac
k
er
co
n
tin
u
es
s
en
d
in
g
d
ata
at
th
is
s
lo
w
r
ate,
th
e
s
er
v
er
is
u
n
ab
le
to
clo
s
e
th
o
s
e
co
n
n
ec
tio
n
s
,
leav
in
g
le
g
itima
te
u
s
er
s
with
n
o
av
ailab
le
r
eso
u
r
ce
s
.
2
.
6
.
1
.
Why
P
o
is
s
o
n
a
rr
iv
a
l h
elps
T
h
e
m
o
tiv
atio
n
b
eh
in
d
ch
o
o
s
in
g
Po
is
s
o
n
ar
r
iv
al
p
r
o
ce
s
s
is
its
r
an
d
o
m
n
ess
,
u
n
p
r
e
d
ictab
ilit
y
,
co
n
tr
o
lled
r
ate
an
d
its
s
lo
w
an
d
g
r
ad
u
al
n
atu
r
e.
I
ts
s
ig
n
if
ican
ce
is
d
escr
ib
ed
as f
o
llo
ws
:
i)
R
an
d
o
m
n
ess
an
d
u
n
p
r
e
d
ictab
ilit
y
:
Po
is
s
o
n
ar
r
iv
al
tim
es
in
tr
o
d
u
ce
r
a
n
d
o
m
n
ess
in
th
e
atta
ck
,
m
ak
in
g
it
h
ar
d
er
to
d
etec
t sin
ce
th
e
r
eq
u
est r
ate
i
s
n
’
t c
o
n
s
tan
t o
r
p
r
ed
ictab
le.
I
t’
s
n
o
t a
s
im
p
le
f
lo
o
d
o
f
p
ac
k
ets,
b
u
t
r
ath
er
p
ac
k
ets ar
r
iv
in
g
at
r
an
d
o
m
in
ter
v
als,
k
ee
p
in
g
attac
k
less
n
o
ticea
b
le
to
in
tr
u
s
io
n
d
etec
tio
n
s
y
s
tem
s
.
ii)
C
o
n
tr
o
lled
r
ate:
th
e
r
ate
o
f
att
ac
k
ca
n
ea
s
ily
b
e
c
o
n
tr
o
lled
.
T
h
e
Po
is
s
o
n
ar
r
iv
al
r
ate
λ
ca
n
b
e
ad
ju
s
ted
b
y
th
e
attac
k
er
to
k
ee
p
t
h
e
n
u
m
b
er
o
f
r
eq
u
ests
o
n
th
e
v
e
r
g
e
o
f
b
ein
g
u
n
d
etec
tab
le,
wh
ile
k
ee
p
in
g
co
n
n
ec
tio
n
s
to
t
h
e
s
er
v
er
o
p
en
f
o
r
as lo
n
g
as p
o
s
s
ib
le.
iii)
Slo
w
an
d
g
r
ad
u
al:
th
e
p
ac
k
et
in
ter
-
ar
r
iv
al
tim
es
ar
e
s
o
ex
p
o
n
en
tial
th
at
th
e
attac
k
is
a
v
er
y
s
lo
w
o
n
e.
T
h
e
attac
k
er
d
o
es
n
o
t
f
lo
o
d
th
e
s
er
v
er
all
at
o
n
ce
;
r
ath
e
r
,
h
e
s
p
r
ea
d
s
it
o
u
t
in
tim
e
to
k
ee
p
i
ts
co
n
n
ec
tio
n
p
o
o
l f
illed
o
v
er
a
lo
n
g
p
er
io
d
o
f
tim
e.
Slo
wlo
r
is
-
s
ty
le
attac
k
s
,
in
wh
i
ch
p
ac
k
ets
ar
e
s
en
t
d
elib
er
atel
y
s
lo
w
an
d
in
an
u
n
p
r
e
d
ictab
l
e
m
an
n
er
.
T
h
is
m
eth
o
d
lo
o
k
s
at
in
c
o
m
in
g
tr
af
f
ic
ch
ar
ac
ter
is
tics
an
d
tr
i
es
to
d
etec
t
a
n
o
m
alies
with
s
u
ch
ch
ar
ac
te
r
is
tic’
s
in
d
icativ
e
o
f
an
attac
k
in
p
r
o
g
r
ess
.
T
im
in
g
s
an
d
f
r
e
q
u
en
cies
o
f
r
eq
u
ests
ca
n
allo
w
f
o
r
th
e
d
is
ce
r
n
in
g
o
f
n
o
r
m
al
u
s
er
b
eh
a
v
io
r
f
r
o
m
ab
u
s
er
s
tr
y
in
g
to
ex
h
au
s
t
s
er
v
er
r
eso
u
r
ce
s
.
T
h
is
p
er
m
its
p
r
o
ac
t
iv
e
d
etec
tio
n
,
th
u
s
in
cr
ea
s
in
g
th
e
r
esis
tiv
ity
o
f
a
s
er
v
er
ag
ai
n
s
t a
d
v
an
ce
d
attac
k
v
ec
to
r
s
u
s
ed
to
d
is
r
u
p
t th
e
a
v
a
ilab
ilit
y
o
f
s
er
v
ice.
2
.
6
.
2
.
Da
t
a
g
ener
a
t
io
n
m
o
du
le
T
h
e
en
tire
p
r
o
ce
s
s
s
tar
ts
with
th
e
R
y
u
co
n
tr
o
ller
'
s
d
ata
g
en
e
r
atio
n
m
o
d
u
le
.
I
n
th
is
m
o
d
u
le
,
th
e
C
PU
an
d
m
em
o
r
y
u
tili
za
tio
n
o
f
th
e
s
er
v
er
,
alo
n
g
with
n
etwo
r
k
th
r
o
u
g
h
p
u
t,
p
ac
k
et
ar
r
iv
al,
p
a
ck
et
s
k
ewn
ess
,
an
d
co
n
n
ec
tio
n
c
o
u
n
t,
am
o
n
g
o
th
e
r
f
ac
to
r
s
,
ar
e
m
o
n
ito
r
e
d
an
d
c
o
llected
co
n
tin
u
o
u
s
ly
th
r
o
u
g
h
th
e
to
o
ls
io
s
tat
an
d
n
etst
at.
T
h
ese
p
ar
am
ete
r
s
h
av
e
a
g
r
ea
t
d
ea
l
o
f
im
p
o
r
tan
ce
s
in
ce
th
ey
ar
e
u
tili
ze
d
i
n
th
e
id
e
n
tific
atio
n
o
f
tr
a
f
f
ic
an
o
m
alies
an
d
attac
k
p
atter
n
s
.
T
h
e
s
er
v
er
is
m
o
n
ito
r
e
d
o
v
er
a
p
er
io
d
o
f
tim
e,
wh
er
e
C
PU
u
tili
za
tio
n
an
d
p
ac
k
et
in
ter
-
ar
r
iv
al
tim
e
t
h
r
esh
o
ld
v
alu
es
ar
e
s
et
th
r
o
u
g
h
M
o
n
te
C
ar
lo
s
im
u
latio
n
.
T
h
e
s
im
u
latio
n
p
r
ed
icts
th
e
s
tatis
t
ical
b
eh
av
io
r
o
f
t
h
e
s
er
v
er
wh
ile
s
p
ec
if
y
in
g
th
r
esh
o
ld
s
ex
ac
tly
co
m
m
e
n
s
u
r
ate
with
n
o
r
m
al
s
er
v
er
ac
tiv
ity
.
T
h
e
Po
is
s
o
n
ar
r
i
v
al
r
ate
is
in
co
r
p
o
r
ate
d
in
to
th
e
d
a
ta
g
en
er
atio
n
p
r
o
ce
s
s
to
m
o
d
e
l
h
o
w
th
e
attac
k
er
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ar
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ate
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ch
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T
P
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eq
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ests
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r
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h
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y
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h
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Po
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o
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s
s
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h
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r
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lts
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tr
af
f
ic
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at
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r
an
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u
t
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n
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r
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lled
,
r
ate
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at
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im
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leg
iti
m
ate
tr
af
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ic,
m
ak
i
n
g
it
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o
r
e
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h
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g
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Fig
u
r
e
1
s
h
o
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e
d
ata
g
en
er
atio
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r
o
ce
s
s
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Fig
u
r
e
1
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Flo
wch
ar
t
o
f
d
ata
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e
n
er
atio
n
p
r
o
ce
s
s
o
f
I
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As
p
ac
k
ets
ar
r
iv
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t
h
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r
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r
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r
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er
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er
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ea
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itio
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ti
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ig
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o
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r
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r
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o
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ac
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ets ar
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o
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b
u
t
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ar
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es,
b
u
t
t
y
p
ically
with
in
a
r
an
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e
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e.
g
.
,
1
-
5
s
ec
o
n
d
s
b
etw
ee
n
p
ac
k
ets).
Du
r
in
g
s
lo
w
Do
S
a
ttack
(
Po
is
s
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Evaluation Warning : The document was created with Spire.PDF for Python.