vlsm workbook instructors edition - v1 0 · pdf file192.168.10.96 192.168.10.126 version 1.0...
TRANSCRIPT
101010010001111100
1011100101011100101100011101001101111010001101000001010010110010100101010110011111110101010001011101001101010011001010010101010101010100011001001010100101100011010110001101011010100001011001010100110100101001001.0172.16.1.0 192.168.10.0
010
10.250.1.0172.31.15.0
192.168.10.96192.168.10.126
Version 1.0
VLSMWorkbook
Variable-Length Subnet Mask
Version 1.0
Instructor’s Edition
IP Address Classes
Class A 1 – 127 (Network 127 is reserved for loopback and internal testing)Leading bit pattern 0 00000000.00000000.00000000.00000000
Class B 128 – 191 Leading bit pattern 10 10000000.00000000.00000000.00000000
Class C 192 – 223 Leading bit pattern 110 11000000.00000000.00000000.00000000
Class D 224 – 239 (Reserved for multicast)
Class E 240 – 255 (Reserved for experimental, used for research)
Private Address Space
Class A 10.0.0.0 to 10.255.255.255
Class B 172.16.0.0 to 172.31.255.255
Class C 192.168.0.0 to 192.168.255.255
Default Subnet Masks
Class A 255.0.0.0
Class B 255.255.0.0
Class C 255.255.255.0
Network . Host . Host . Host
Network . Network . Host . Host
Network . Network . Network . Host
Inside Cover
This workbook assumes you already have a background in subnetting. If you don’t you maywant to consider completing the IP Addressing and Subnetting Workbook.
Produced by: Robb [email protected]
Frederick County Career & Technology CenterCisco Networking Academy
Frederick County Public SchoolsFrederick, Maryland, USA
Special Thanks to Melvin Baker and Jim Dorschfor taking the time to check this workbook for errors.
Instructors (and anyone else for that matter) please do not post the Instructors version on public websites.When you do this your giving everyone else worldwide the answers. Yes, students look for answers this way.
It also discourages others; myself included, from posting high quality materials.
0
255
/24255.255.255.0
256 Hosts1 Subnet
What is VLSM
Variable Length Subnet Masks allow you a much tighter control overyour addressing scheme. If you use a class C address with a default subnetmask you end up with one subnet containing 256 addresses. By using VLSMyou can adjust the number of subnets and number of addresses dependingon the specific needs of your network. The same rules apply to a class A orB addresses.
VLSM is supported by Cisco, OSPF, Dual IS-IS, BGP-4, and EIGRP.You need to configure your router for Variable Length Subnet Masking bysetting up one of these protocols. Then configure the subnet masks of thevarious interfaces in the IP address interface sub-command. To usesupernet you must also configure IP classless routes.
The Box Method
The box method is the simplest way to visualize the breakdown of arange of addresses into smaller different sized subnets.
1
Start with a square. The whole squareis a single subnet comprised of 256addresses.
0
255127
128
0
255127
128
6364 192
191
0
255127
128
6364 192
191
32
31
95
96159
223
224
160
/25255.255.255.128
128 Hosts2 Subnets
/26255.255.255.192
64 Hosts4 Subnets
/27255.255.255.224
32 Hosts8 Subnets
2
Split the box in half and you get twosubnets with 128 addresses,
Divide the box into quarters and youget four subnets with 64 addresses,
Split each individual square and youget eight subnets with 32 addresses,
3
0
255127
128
6364 192
191
32
31
95
96159
223
224
160
1516 48
47
79 11180 112
0 12832 160
15 47
143 175176144
240208239207
39 175167135 1437
11 4335 171163131 1393
27 5951 187179147 15519
31 6355 191183151 15923
75 10799 235227195 20367
79 111103 239321199 20771
91 123115 251243211 21983
95 127119 255247215 22387
408 136 168
4 13236 1644412 140 172
16 14448 1765624 152 184
20 14852 1806028 156 188
64 19296 22410472 200 232
68 196100 22810876 204 236
80 208112 24012088 216 248
84 212116 24412492 220 252
0 12832 160
15 4739 175167135 1437
31 6355 191183151 15923
79 111103 239321199 20771
95 127119 255247215 22387
408 136 168
16 14448 1765624 152 184
64 19296 22410472 200 232
80 208112 24012088 216 248
/30255.255.255.252
4 Hosts64 Subnets
/29255.255.255.248
8 Hosts32 Subnets
/28255.255.255.240
16 Hosts16 Subnets
Split the boxes in half again and youget sixteen subnets with sixteenaddresses,
The next split gives you thirty twosubnets with eight addresses,
The last split gives sixty four subnetswith four addresses each,You can use these squares in anycombination to fit your addressingneeds.
Color in the squares used with differentshades to highlight each subnet.
VLSM Addressing(Sample)
Problem 1Using the network diagram and information given create an addressing
scheme which utilizes variable-length subnet masks. Show the subnetaddress and subnet mask in the boxes below, color or shade the sub-subnetsused in the box. This business will be using the class C address 220.10.10.0.Remember to start with your largest groups first.
MarketingDepartment
60 Hosts
LAN Address:
220.10.10.0/26
ResearchDepartment
28 Hosts
LAN Address:
220.10.10.64/27
0
255127
128
6364
95
96
4
VLSM Addressing(Sample)
Problem 2Using the network diagram and information given create an addressing
scheme which utilizes variable-length subnet masks. Show the subnetaddress and subnet mask in the boxes below, color or shade the sub-subnetsused in the box. This company will be using the class C address 192.168.16.0.Remember to start with your largest groups first.
Washington D.C.120 Hosts
Frederick20 Hosts
Baltimore60 Hosts
0
255127
128
192191
223
LAN Address:
192.168.16.0/25
LAN Address:
192.168.16.192/27LAN Address:
192.168.16.128/26
WAN Address #1:
192.168.16.224/30 WAN Address #2:
192.168.16.228/30
227
239321
224 232
228
240
Color in the squares used with differentshades to highlight each sub-subnet.
5
6
VLSM Addressing
Problem 3Using the network diagram and information given create an addressing
scheme which utilizes variable-length subnet masks. Show the subnetaddress and subnet mask in the boxes below, color or shade the sub-subnetsused in the box. This company will be using the class C address 190.10.10.0.Remember to start with your largest groups first.
Dallas.60 Hosts
Ft. Worth25 Hosts
LAN Address:
LAN Address:
WAN Address #1:
Color in the squares used with differentshades to highlight each sub-subnet.
0
255
128
6364
95
96
192.10.10.0/26
192.10.10.96/30
192.10.10.64/27
99
103 111
127
104
100
112
VLSM Addressing
Problem 4Using the network diagram and information given create an addressing
scheme which utilizes variable-length subnet masks. Show the subnetaddress and subnet mask in the boxes below, color or shade the sub-subnetsused in the box. This company will be using the class C address 220.108.38.0.Remember to start with your largest groups first.
Corpus Christi25 Hosts
Waco50 Hosts
Houston120 Hosts
LAN Address:
LAN Address:LAN Address:
WAN Address #1:WAN Address #2:
Color in the squares used with differentshades to highlight each sub-subnet.
7
0 12832 160
15 4739 175167135 1437
11 4335 171163131 1393
27 5951 187179147 15519
31 6355 191183151 15923
75 10799 235227195 20367
79 111103 239321199 20771
91 123115 251243211 21983
95 127119 255247215 22387
408 136 168
4 13236 1644412 140 172
16 14448 1765624 152 184
20 14852 1806028 156 188
64 19296 22410472 200 232
68 196100 22810876 204 236
80 208112 24012088 216 248
84 212116 24412492 220 252
220.108.38.224/30
220.108.38.128/26
220.108.38.228/30
220.108.38.192/27
220.108.38.0/25
8
VLSM Addressing
Problem 5Using the network diagram and information given create an addressing
scheme which utilizes variable-length subnet masks. Show the subnetaddress and subnet mask in the boxes below, color or shade the sub-subnets used in the box. This company will be using the class C address192.168.10.0. Remember to start with your largest groups first.
New York115 Hosts
Fargo23 Hosts
LAN Address:
LAN Address:
WAN Address #2:
Color in the squares used with differentshades to highlight each sub-subnet.
San Jose
12 Hosts
48 Hosts
LAN Address:
LAN Address:
WAN Address #1:
0 12832 160
15 4739 175167135 1437
11 4335 171163131 1393
27 5951 187179147 15519
31 6355 191183151 15923
75 10799 235227195 20367
79 111103 239321199 20771
91 123115 251243211 21983
95 127119 255247215 22387
408 136 168
4 13236 1644412 140 172
16 14448 1765624 152 184
20 14852 1806028 156 188
64 19296 22410472 200 232
68 196100 22810876 204 236
80 208112 24012088 216 248
84 212116 24412492 220 252
192.168.10.240/30
192.168.10.128/26
192.168.10.192/27
192.168.10.244/30
192.168.10.0/25
192.168.10.224/28
VLSM Addressing
Problem 6Using the network diagram and information given create an addressing
scheme which utilizes variable-length subnet masks. Show the subnetaddress and subnet mask in the boxes below, color or shade the sub-subnets used in the box. This company will be using the class C address222.10.150.0. Remember to start with your largest groups first.
Boston
LAN Address:
WAN Address #1:
Draw the necessary lines and color in the used squareswith different shades to highlight each sub-subnet.
9
London
WAN Address #2:
6 Hosts
12 Hosts
LAN Address:
24 Hosts 37 Hosts
LAN Address:
LAN Address:
0
255
111
128
6364 192
191
32
31
95
96159
223
224
160
222.10.150.120/30 222.10.150.124/30
222.10.150.112/29
222.10.150.0/26
222.10.150.64/27
222.10.150.96/28
123
127119
112 120
124
10
VLSM Addressing
Problem 7Using the network diagram and information given create an addressing
scheme which utilizes variable-length subnet masks. Show the subnetaddress and subnet mask in the boxes below, color or shade the sub-subnetsused in the box. This company will be using the class C address 200.150.70.0.Remember to start with your largest groups first.
Draw the necessary lines and color in the used squareswith different shades to highlight each sub-subnet.
Boston
LAN Address:
6 Hosts
12 Hosts
LAN Address:
LAN Address:
14 Hosts
LAN Address:
25 Hosts
0
255127
128
6364 192
191
200.150.70.0/27
200.150.70.32/28
200.150.70.64/29
200.150.70.48/28
32
4847
71
31
VLSM Addressing
Problem 8Using the network diagram and information given create an addressing
scheme which utilizes variable-length subnet masks. Show the subnetaddress and subnet mask in the boxes below, color or shade the sub-subnetsused in the box. This company will be using the class C address 192.168.24.0.Remember to start with your largest groups first.
LAN Address:
Draw the necessary lines and color in the used squareswith different shades to highlight each sub-subnet.
11
London
WAN Address #1:
18 Hosts
LAN Address:
95 Hosts 12 Hosts
LAN Address:
LAN Address:
0
255
34 Hosts
192.168.24.240/30
192.168.24.224/28
192.168.24.0/25
192.168.24.192/27
192.168.24.128/26
127
128
191192
223
224
239
243
240
VLSM
Add
ress
ing
(Sam
ple)
Prob
lem
9Yo
u ar
e de
velo
ping
a s
choo
l net
wor
k w
ith th
e cl
ass
C a
ddre
ss 1
92.1
68.2
.0/2
4. T
here
will
be th
ree
com
pute
r lab
s w
ith 3
0 co
mpu
ters
eac
h th
at n
eed
to b
e on
diff
eren
t sub
-sub
nets
. Fo
rty e
ight
cla
ssro
oms
with
one
com
pute
r eac
h th
at w
ill co
mpr
ise
a si
ngle
sub
-sub
net.
The
adm
inis
trativ
e of
fice
and
guid
ance
offi
ceco
ntai
n a
tota
l of s
even
com
pute
rs w
hich
will
need
to b
e gr
oupe
d to
geth
er.
Pla
n fo
r fou
r mor
e m
ini l
abs
with
six
com
pute
rs to
eac
h su
b-su
bnet
wor
k. D
ivid
e th
e ne
twor
k us
ing
varia
ble
leng
th s
ubne
t mas
ks.
Com
plet
eth
e in
form
atio
n re
quire
d be
low
. R
emem
ber t
o w
ork
from
larg
est t
o sm
alle
st.
Subn
et
1 2 3 4 5 6 7 8 9 10 11 12 13 14
Subn
etA
ddre
ss19
2.1
68.2
.019
2.1
68.2
.64
192
.168
.2.9
619
2.1
68.2
.12
819
2.1
68.2
.160
192
.168
.2.1
7619
2.1
68.2
.184
192
.168
.2.1
9219
2.1
68.2
.200
Subn
etM
ask
(/X)
/26
/27
/27
/27
/28
/29
/29
/29
/29
Firs
t Usa
ble
Hos
t19
2.1
68.2
.119
2.1
68.2
.65
192
.168
.2.9
719
2.1
68.2
.12
919
2.1
68.2
.161
192
.168
.2.1
7719
2.1
68.2
.185
192
.168
.2.1
9319
2.1
68.2
.201
Last
Usa
ble
Hos
t19
2.1
68.2
.62
192
.168
.2.9
419
2.1
68.2
.12
619
2.1
68.2
.15
819
2.1
68.2
.174
192
.168
.2.1
8219
2.1
68.2
.190
192
.168
.2.1
9819
2.1
68.2
.206
Bro
adca
stA
ddre
ss19
2.1
68.2
.63
192
.168
.2.9
519
2.1
68.2
.12
719
2.1
68.2
.15
919
2.1
68.2
.175
192
.168
.2.1
8319
2.1
68.2
.191
192
.168
.2.1
9919
2.1
68.2
.207
12
13
VLSM
Add
ress
ing
(Sam
ple)
Prob
lem
10
You
are
setti
ng u
p a
smal
l bus
ines
s ne
twor
k w
ith th
e cl
ass
C a
ddre
ss 2
20.5
5.80
.0/2
4. T
he m
arke
ting
divi
sion
will
need
12
com
pute
rs.
Res
earc
h an
d de
velo
pmen
t nee
ds 2
7 co
mpu
ters
. Th
e re
cept
ion
area
will
need
two
com
pute
rs.
Man
agem
ent r
equi
res
19 c
ompu
ters
. D
ivid
e th
e ne
twor
k us
ing
varia
ble
leng
th s
ubne
tm
asks
. C
ompl
ete
the
info
rmat
ion
requ
ired
belo
w.
Rem
embe
r to
wor
k fro
m la
rges
t to
smal
lest
.
Subn
et
1 2 3 4 5 6 7 8 9 10 11 12 13 14
Subn
etA
ddre
ss2
20.
55
.80.
02
20.
55
.80.
322
20.
55
.80.
642
20.5
5.8
0.8
0
Subn
etM
ask
(/X)
/27
/27
/28
/30
Firs
t Usa
ble
Hos
t2
20.
55
.80.
12
20.
55
.80.
22
0.5
5.8
0.65
22
0.5
5.8
0.8
1
Last
Usa
ble
Hos
t2
20.
55
.80.
302
20.
55
.80.
622
20.5
5.8
0.7
82
20.5
5.8
0.8
2
Bro
adca
stA
ddre
ss2
20.
55
.80.
312
20.
55
.80.
632
20.
55
.80.
792
20.5
5.8
0.8
3
14
VLSM
Add
ress
ing
Prob
lem
11
You
are
setti
ng u
p a
med
ium
siz
ed n
etw
ork
with
the
clas
s C
add
ress
222
.37.
34.0
/24.
Mar
ketin
g ne
eds
29 c
ompu
ters
. R
esea
rch
and
deve
lopm
ent n
eeds
110
com
pute
rs.
Boo
kkee
ping
will
use
12 c
ompu
ters
.Th
e re
cept
ion
area
will
need
thre
e co
mpu
ters
. M
anag
emen
t req
uire
s 60
com
pute
rs.
Div
ide
the
netw
ork
usin
g va
riabl
e le
ngth
sub
net m
asks
. C
ompl
ete
the
info
rmat
ion
requ
ired
belo
w.
Rem
embe
r to
wor
k fro
mla
rges
t to
smal
lest
.
Subn
et
1 2 3 4 5 6 7 8 9 10 11 12 13 14
Subn
etA
ddre
ss2
22
.37.
34.0
22
2.3
7.34
.12
82
22
.37.
34.1
922
22
.37.
34.2
24
22
2.3
7.34
.240
Subn
etM
ask
(/X)
/25
/26
/27
/28
/29
Firs
t Usa
ble
Hos
t2
22
.37.
34.1
22
2.3
7.34
.12
92
22
.37.
34.1
932
22
.37.
34.2
25
22
2.3
7.34
.241
Last
Usa
ble
Hos
t2
22
.37.
34.1
26
22
2.3
7.34
.190
22
2.3
7.34
.22
22
22
.37.
34.2
382
22
.37.
34.2
46
Bro
adca
stA
ddre
ss2
22
.37.
34.1
27
22
2.3
7.34
.191
22
2.3
7.34
.22
32
22
.37.
34.2
392
22
.37.
34.2
47
15
VLSM
Add
ress
ing
Prob
lem
12
A s
hipp
ing
com
pany
nee
ds to
set
up
its n
etw
ork
acro
ss s
ever
al lo
catio
ns.
The
Den
ver o
ffice
nee
ds s
ixco
mpu
ters
. Th
e W
aco
offic
e ne
eds
22 c
ompu
ters
. Th
e Fa
rgo
offic
e w
ill ne
ed fi
ve c
ompu
ters
. Th
e W
ANlin
ks b
etw
een
all t
hree
loca
tions
nee
d to
be
incl
uded
in th
e so
lutio
n. U
sing
the
IP a
ddre
ss 1
92.1
68.1
0.0/
24di
vide
the
netw
ork
usin
g VL
SM.
Com
plet
e th
e in
form
atio
n re
quire
d be
low
. R
emem
ber t
o w
ork
from
larg
est
to s
mal
lest
.
Subn
et
1 2 3 4 5 6 7 8 9 10 11 12 13 14
Subn
etA
ddre
ss19
2.1
68.1
0.0
192
.168
.10.3
219
2.1
68.1
0.4
019
2.1
68.1
0.4
819
2.1
68.1
0.5
2
Subn
etM
ask
(/X)
/27
/29
/29
/30
/30
Firs
t Usa
ble
Hos
t19
2.1
68.1
0.1
192
.168
.10.3
319
2.1
68.1
0.4
119
2.1
68.1
0.4
919
2.1
68.1
0.5
3
Last
Usa
ble
Hos
t19
2.1
68.1
0.3
019
2.1
68.1
0.3
819
2.1
68.1
0.4
619
2.1
68.1
0.5
019
2.1
68.1
0.5
4
Bro
adca
stA
ddre
ss19
2.1
68.1
0.3
119
2.1
68.1
0.3
919
2.1
68.1
0.4
719
2.1
68.1
0.5
119
2.1
68.1
0.5
5
16
VLSM
Add
ress
ing
Prob
lem
13
A n
ew s
choo
l is
bein
g bu
ilt in
the
loca
l sch
ool d
istri
ct.
It w
ill ha
ve th
ree
com
pute
r lab
s w
ith 2
8co
mpu
ters
eac
h. T
here
will
be 5
8 cl
assr
oom
s w
ith 2
com
pute
rs e
ach
that
nee
d to
be
on o
ne s
ub-s
ubne
t.Th
e of
fice
staf
f and
adm
inis
trato
rs w
ill ne
ed 7
com
pute
rs.
The
guid
ance
and
atte
ndan
ce o
ffice
will
have
5co
mpu
ters
. S
etup
the
rem
aini
ng a
ddre
ssin
g in
to o
ne s
ub-s
ubne
t for
futu
re e
xpan
sion
. Th
e sc
hool
has
bee
ngi
ven
the
addr
ess
223.
145.
75.0
/24.
C
ompl
ete
the
info
rmat
ion
requ
ired
belo
w.
Rem
embe
r to
wor
k fro
mla
rges
t to
smal
lest
.
Subn
et
1 2 3 4 5 6 7 8 9 10 11 12 13 14
Subn
etA
ddre
ss2
23.
145
.75
.02
23.
145
.75
.12
82
23.
145
.75
.160
22
3.14
5.7
5.1
922
23.
145
.75
.22
42
23.
145
.75
.240
22
3.14
5.7
5.2
48
Subn
etM
ask
(/X)
/25
/27
/27
/27
/28
/29
/29
Firs
t Usa
ble
Hos
t2
23.
145
.75
.12
23.
145
.75
.12
92
23.
145
.75
.161
22
3.14
5.7
5.1
932
23.
145
.75
.22
52
23.
145
.75
.241
22
3.14
5.7
5.2
49
Last
Usa
ble
Hos
t2
23.
145
.75
.12
62
23.
145
.75
.15
82
23.
145
.75
.190
22
3.14
5.7
5.2
22
22
3.14
5.7
5.2
382
23.
145
.75
.246
22
3.14
5.7
5.2
54
Bro
adca
stA
ddre
ss2
23.
145
.75
.12
72
23.
145
.75
.15
92
23.
145
.75
.191
22
3.14
5.7
5.2
23
22
3.14
5.7
5.2
392
23.
145
.75
.247
22
3.14
5.7
5.2
55
17
VLSM
Add
ress
ing
Prob
lem
14
A lo
cal c
olle
ge is
set
ting
up a
cam
pus
wid
e ne
twor
k. T
he te
chno
logy
win
g w
ill be
on
its o
wn
netw
ork
addr
ess
of 1
92.1
68.2
50.0
/24.
Th
e of
fice
win
g w
ill in
clud
e 15
com
pute
rs.
Ther
e ar
e 2
labs
of 2
0 co
mpu
ters
each
, 2 la
bs o
f 30
com
pute
rs e
ach
and
one
lab
of 3
5 co
mpu
ters
. C
ompl
ete
the
info
rmat
ion
requ
ired
belo
w.
Rem
embe
r to
wor
k fro
m la
rges
t to
smal
lest
.
Subn
et
1 2 3 4 5 6 7 8 9 10 11 12 13 14
Subn
etA
ddre
ss19
2.1
68.2
50.
092
.168
.25
0.64
92.1
68.2
50.
9692
.168
.25
0.12
892
.168
.25
0.16
092
.168
.25
0.19
2
Subn
etM
ask
(/X)
/26
/27
/27
/27
/27
/27
Firs
t Usa
ble
Hos
t92
.168
.25
0.1
92.1
68.2
50.
6592
.168
.25
0.97
92.1
68.2
50.
129
92.1
68.2
50.
161
92.1
68.2
50.
193
Last
Usa
ble
Hos
t92
.168
.25
0.62
92.1
68.2
50.
9492
.168
.25
0.12
692
.168
.25
0.15
892
.168
.25
0.19
092
.168
.25
0.222
Bro
adca
stA
ddre
ss92
.168
.25
0.63
92.1
68.2
50.
9592
.168
.25
0.12
792
.168
.25
0.15
992
.168
.25
0.19
192
.168
.25
0.2
23
18
VLSM
Add
ress
ing
Prob
lem
15
You
are
setti
ng u
p a
netw
ork
for a
com
pany
in fo
ur lo
catio
ns.
Loca
tion
A ha
s 8
com
pute
rs.
Loca
tion
Bha
s 12
2 co
mpu
ters
. Lo
catio
n C
has
4 c
ompu
ters
. Lo
catio
n D
has
55
com
pute
rs.
Ther
e is
a W
AN
con
nec-
tion
betw
een
all f
our l
ocat
ions
. C
ompl
ete
the
info
rmat
ion
requ
ired
belo
w u
sing
the
clas
s C
add
ress
192.
168.
10.0
. R
emem
ber
to w
ork
from
larg
est t
o sm
alle
st.
Subn
et
1 2 3 4 5 6 7 8 9 10 11 12 13 14
Subn
etA
ddre
ss19
2.1
68.1
0.0
192
.168
.10.1
28
192
.168
.10.
192
192
.168
.10.2
08
192
.168
.10.2
1619
2.1
68.1
0.2
20
192
.168
.10.
22
4
Subn
etM
ask
(/X)
/25
/26
/28
/29
/30
/30
/30
Firs
t Usa
ble
Hos
t19
2.1
68.1
0.1
192
.168
.10.
129
192
.168
.10.1
9319
2.1
68.1
0.2
0919
2.1
68.1
0.2
1719
2.1
68.1
0.2
21
192
.168
.10.
22
5
Last
Usa
ble
Hos
t19
2.1
68.1
0.1
26
192
.168
.10.1
9019
2.1
68.1
0.2
06
192
.168
.10.2
1419
2.1
68.1
0.2
1819
2.1
68.1
0.2
22
192
.168
.10.
22
6
Bro
adca
stA
ddre
ss19
2.1
68.1
0.1
27
192
.168
.10.1
9119
2.1
68.1
0.2
07
192
.168
.10.
215
192
.168
.10.
219
192
.168
.10.
22
319
2.1
68.1
0.2
27
19
VLSM
Add
ress
ing
Prob
lem
16
A co
llege
dor
mito
ry is
bei
ng re
mol
ded.
A n
ew n
etw
ork
is b
eing
inst
alle
d. T
here
are
50
dorm
room
sw
ith tw
o dr
ops
each
that
will
be o
n on
e su
b-su
bnet
. Th
e of
fices
will
have
5 d
rops
. Th
e re
cept
ion
desk
will
have
thre
e dr
ops.
A s
mal
l stu
dy h
all w
ill in
clud
e 30
dro
ps.
Usi
ng th
e IP
add
ress
192
.168
.12.
0/24
com
plet
eth
e in
form
atio
n re
quire
d be
low
usi
ng V
LSM
. W
ork
from
larg
est t
o sm
alle
st.
Subn
et
1 2 3 4 5 6 7 8 9 10 11 12 13 14
Subn
etA
ddre
ss19
2.1
68.1
2.0
192
.168
.12
.12
819
2.1
68.1
2.1
6019
2.1
68.1
2.1
68
Subn
etM
ask
(/X)
/25
/27
/29
/29
Firs
t Usa
ble
Hos
t19
2.1
68.1
2.1
192
.168
.12
.12
919
2.1
68.1
2.1
6119
2.1
68.1
2.1
69
Last
Usa
ble
Hos
t19
2.1
68.1
2.1
26
192
.168
.12
.15
819
2.1
68.1
2.1
6619
2.1
68.1
2.1
74
Bro
adca
stA
ddre
ss19
2.1
68.1
2.1
27
192
.168
.12
.15
919
2.1
68.1
2.1
6719
2.1
68.1
2.1
75
20
VLSM
Add
ress
ing
Prob
lem
17
You
are
setti
ng u
p a
busi
ness
net
wor
k w
ith th
e cl
ass
C a
ddre
ss 2
19.7
5.16
0.0/
24.
The
mar
ketin
gdi
visi
on w
ill ne
ed 1
9 co
mpu
ters
. R
esea
rch
and
deve
lopm
ent n
eeds
40
com
pute
rs.
The
rece
ptio
n ar
ea w
illne
ed fo
ur c
ompu
ters
. M
anag
emen
t req
uire
s 12
com
pute
rs.
Div
ide
the
netw
ork
usin
g va
riabl
e le
ngth
sub
net
mas
ks.
On
the
oppo
site
pag
e dr
aw a
det
aile
d m
ap o
f thi
s ne
twor
k. I
nclu
de th
e su
b-su
bnet
IP a
ddre
sses
for
each
bra
nch
of th
e ne
twor
k w
ith th
e su
bnet
mas
k. O
ne ro
uter
with
four
eth
erne
t por
ts w
ill be
use
d fo
r thi
sne
twor
k.
Subn
et
1 2 3 4 5 6 7 8 9 10 11 12 13 14
Subn
etA
ddre
ss2
19.7
5.1
60.0
219
.75
.160
.64
219
.75
.160
.96
219
.75
.160
.112
Subn
etM
ask
(/X)
/26
/27
/28
/29
Firs
t Usa
ble
Hos
t2
19.7
5.1
60.1
219
.75
.160
.65
219
.75
.160
.97
219
.75
.160
.113
Last
Usa
ble
Hos
t2
19.7
5.1
60.6
22
19.7
5.1
60.9
42
19.7
5.1
60.1
102
19.7
5.1
60.1
18
Bro
adca
stA
ddre
ss2
19.7
5.1
60.6
32
19.7
5.1
60.9
52
19.7
5.1
60.1
112
19.7
5.1
60.1
19
21
Prob
lem
17
- Det
aile
d M
ap
Res
earc
h &
Dev
elop
men
t40
Com
pute
rs2
19.7
5.1
60 t
o .6
325
5.2
55
.25
5.1
92M
arke
ting
19 C
ompu
ters
219
.75
.160
. 64
to .9
525
5.2
55
.25
5.2
24
Rec
epti
on4
Com
pute
rs2
19.7
5.1
60.1
12 t
o .1
1925
5.2
55
.25
5.2
48M
anag
emen
t12
Com
pute
rs2
19.7
5.1
60.9
6 to
.111
25
5.2
55
.25
5.2
40
22
VLSM
Add
ress
ing
Prob
lem
18
A sm
all c
ompa
ny n
eeds
to s
et u
p its
net
wor
k ac
ross
sev
eral
loca
tions
. Th
e N
ew Y
ork
bran
ch o
ffice
need
s 15
com
pute
rs.
The
San
Jos
e of
fice
need
s 66
com
pute
rs.
The
Trin
idad
offi
ce w
ill ne
ed 1
8co
mpu
ters
. Th
e W
AN
link
s be
twee
n al
l thr
ee lo
catio
ns n
eed
to b
e in
clud
ed.
Usi
ng th
e IP
add
ress
195.
20.5
.0/2
4 di
vide
the
netw
ork
usin
g V
LSM
. O
n th
e op
posi
te p
age
draw
a d
etai
led
map
of t
his
netw
ork.
Incl
ude
the
sub-
subn
et IP
add
ress
es fo
r eac
h br
anch
of t
he n
etw
ork
with
the
subn
et m
ask.
Lab
el th
e W
ANlin
ks w
ith th
e sa
me
info
rmat
ion.
Com
plet
e th
e in
form
atio
n re
quire
d be
low
. W
ork
from
larg
est t
o sm
alle
st.
Subn
et
1 2 3 4 5 6 7 8 9 10 11 12 13 14
Subn
etA
ddre
ss19
5.2
0.5
.019
5.2
0.5
.12
819
5.2
0.5
.160
195
.20.
5.1
9219
5.2
0.5
.196
Subn
etM
ask
(/X)
/25
/27
/27
/30
/30
Firs
t Usa
ble
Hos
t19
5.2
0.5
.119
5.2
0.5
.129
195
.20.
5.1
6119
5.2
0.5
.193
195
.20.
5.1
97
Last
Usa
ble
Hos
t19
5.2
0.5
.12
619
5.2
0.5
.15
819
5.2
0.5
.190
195
.20.
5.1
9419
5.2
0.5
.198
Bro
adca
stA
ddre
ss19
5.2
0.5
.12
719
5.2
0.5
.15
919
5.2
0.5
.191
195
.20.
5.1
9519
5.2
0.5
.199
Prob
lem
18
- Det
aile
d M
ap
23
66 C
ompu
ters
195
.20.
5.0
to
.12
725
5.2
55
.25
5.1
28
Rec
epti
on4
Com
pute
rs19
5.2
0.5
.160
to
.191
25
5.2
55
.25
5.2
24
Man
agem
ent
12 C
ompu
ters
195
.20.
5.1
28
to .1
59
25
5.2
55
.25
5.2
24
New
Yor
kTr
inid
adS
an J
ose 19
5.2
0.5
.192
to
.195
25
5.2
55
.25
5.2
52
195
.20.
5.1
96 t
o .1
9925
5.2
55
.25
5.2
52
24
Class A Addressing Guide# of Bits
Borrowed23456789
10111213141516171819202122
SubnetMask
255.192.0.0255.224.0.0255.240.0.0255.248.0.0255.252.0.0255.254.0.0255.255.0.0
255.255.128.0255.255.192.0255.255.224.0255.255.240.0255.255.248.0255.255.252.0255.255.254.0255.255.255.0
255.255.255.128255.255.255.192255.255.255.224255.255.255.240255.255.255.248255.255.255.252
Total # ofSubnets
48163264
128256512
1,0242,0484,0968,192
16,38432,76865,536
131,072262,144524,288
1,048,5762,097,1524,194,304
Usable # ofSubnets
26143062
126254510
1,0222,0464,0948,190
16,38232,76665,534
131,070262,142524,286
1,048,5742,097,1504,194,302
Total # ofHosts
4,194,3042,097,1521,048,576524,288262,144131,07265,53632,76816,3848,1924,0962,0481,02451225612864321684
Usable # ofHosts
4,194,3022,097,1501,048,574524,286262,142131,07065,53432,76616,3828,1904,0942,0461,02251025412662301462
Class B Addressing Guide# of Bits
Borrowed23456789
1011121314
SubnetMask
255.255.192.0255.255.224.0255.255.240.0255.255.248.0255.255.252.0255.255.254.0255.255.255.0
255.255.255.128255.255.255.192255.255.255.224255.255.255.240255.255.255.248255.255.255.252
Total # ofSubnets
48163264
128256512
1,0242,0484,0968,192
16,384
Usable # ofSubnets
26143062
126254510
1,0222,0464,0948,190
16,382
Total # ofHosts16,3848,1924,0962,0481,02451225612864321684
Usable # ofHosts16,3828,1904,0942,0461,02251025412662301462
Class C Addressing Guide# of Bits
Borrowed23456
SubnetMask
255.255.255.192255.255.255.224255.255.255.240255.255.255.248255.255.255.252
Total # ofSubnets
48163264
Usable # ofSubnets
26143062
Total # ofHosts
64321684
Usable # ofHosts
62301462
0-127
128-255
0-31
32-63
64-95
96-127
128-159
160-191
192-223
224-255
Inside Cover
VLSM Chart 24-30 Bits
0-34-78-11
12-1516-1920-2324-2728-3132-3536-3940-4344-4748-5152-5556-5960-6364-6768-7172-7576-7980-8384-8788-9192-9596-99
100-103104-107108-111112-115116-119120-123124-127128-131132-135136-139140-143144-147148-151152-155156-159160-163164-167168-171172-175176-179180-183184-187188-191192-195196-199200-203204-207208-211212-215216-219220-223224-227228-231232-235236-239240-243244-247248-251252-255
/30255.255.255.252
4 Hosts
/29255.255.255.248
8 Hosts
/28255.255.255.240
16 Hosts
/27255.255.255.224
32 Hosts
/26255.255.255.192
64 Hosts
/25255.255.255.128
128 Hosts
/24255.255.255.0
256 Hosts
0-7
8-15
16-23
24-31
32-39
40-47
48-55
56-63
64-71
72-79
80-87
88-95
96-103
104-111
112-119
120-127
128-135
136-143
144-151
152-159
16-167
168-175
176-183
184-191
192-199
200-207
208-215
216-223
224-231
232-239
240-247
248-255
0-15
16-31
32-47
48-63
64-79
80-95
96-111
112-127
128-143
144-159
160-175
176-191
192-207
208-223
224-239
240-255
0-63
64-127
128-191
192-255
0-127