SUBNETTING

cursefarmNetworking and Communications

Oct 24, 2013 (3 years and 9 months ago)

88 views

SUBNETTING
INTRODUCTION
INTRODUCTION

Insubnetting,anetworkisdividedintosmallersubnetswith
each
subnet
having
its
own
subnet
address
.
each
subnet
having
its
own
subnet
address
.
ReasonsforSubnetting 
MostIPaddressassignmentswerenotusedveryefficiently.

Broadcastproblem.

Manysiteswererequestingmultiplenetworknumbersdueto
ibl
f
k
hi
i
var
i
a
bl
eamountso
f
networ
k
satt
h
e
i
rs
i
tes.
BENEFITSOFSUBNETTING

Reduced network traffic

Simplified management

Smaller broadcast domains
SUBNETTING
Masking
SUBNET
MASK
How do we determine the entire subnets inside our network?
HOWTOKNOWNETWORKISSUBNETTED
IP Address: 192.168.2.1
SubnetMask:2552552550
Subnet

Mask:

255
.
255
.
255
.
0
With Prefix Notation: 192.168.2.1/24
Prefix Notation
IP Address: 132.168.64.3/18
Subnet Mask: 255.255.192.0
SUBNETTING
: HO
W
TO?

N
umber of host bits used for subnettin
g
g

What are the sub netted Network IDs

What are the IP Addresses for each new subnet?
N
UMBER
OF
HOST
BITS
USED
FOR
SUBNETTING
N
UMBER
OF
HOST
BITS
USED
FOR
SUBNETTING

How many subnets I will have in the future
U
bih
hhd

U
se more
bi
ts to overcome t
h
e c
h
ange over
h
ea
d
.
Another Example
Network
ID:19116800
Network

ID:

191
.
168
.
0
.
0
Use 3 bits
Subnet Mask: 255.255.224.0
Subnets of the example
HOWMANYHOSTSALLOWEDFOREACHSUBNETOFTHEPREVIOUSEXAMPLE
?
Static Subnetting

All subnets in the subnettednetwork use the same subnet mask

Easy to implement

Waste IP Addresses
Variable Subnetting
Sb
diffbk

S
u
b
nets use
diff
erent su
b
net mas
k
s

Real world environments

﹯葉



葉






Variable SubnettingExample
Network ID: 135.41.0.0/16
24 subnets are required as follows:

One subnet with up to 32000 hosts
15
btitht2000ht

15
su
b
ne
t
s w
ith
up
t
o
2000

h
os
t
s

8 subnets with up to 250 hosts
One subnet with up to 32000 hosts

Ineedonebitonlytosubnet

I

need

one

bit

only

to

subnet

Subnet ID options:
15 SUBNETSWITHUPTO
2000 HOSTS
I
NEED
4
BITS
TO
SUBNET
I

NEED
4

BITS
TO
SUBNET
SUBNET
ID OPTIONS:
8 SUBNETSWITHUPTO
250 HOSTS
I
3
I
NEED
3
BITSTOSUBNET
SUBNET
ID OPTIONS:
A
PPLICATIONS

NETWORK MANAGEMENT

BROADCASTING MESSAGES
SCOPE OF RESEARCH 
SUBNET ADDRESSING IN IPv10 and further
versions of IP Protocol
A
SSIGNMENT
12

Wh
y
subnettin
g
is re
q
uired?
y
g
q