Subnetting (Part 3 - VLSM)

192.168.1.192/27 (/27 = 30 hosts)

192.168.1.11000000 = 192.168.1.192 network address
192.168.1.11011111 = 192.168.1.223 broadcast address
192.168.1.193 = first usable
192.168.1.222 = last usable
30 host usable

192.168.1.224/28 (/28 = 14 hosts)

192.168.1.11100000 = 192.168.1.224 network address
192.168.1.11101111 = 192.168.1.239 broadcast address
192.168.1.225 = first usable
192.168.1.238 = last usable
14 hosts usable

192.168.1.240/30 (/30 = 2hosts)

192.168.1.11110000 = 192.168.1.240 network address
192.168.1.11110011 = 192.168.1.243 broadcast address
192.168.1.241 = first usable
192.168.1.242 = last usable
2 hosts

192.168.5.0/24

Lan2 
192.168.5.0/25 (/25 = 126 hosts)
192.168.5.0000 0000 = 192.168.5.0 network address
192.168.5.0111 1111 = 192.168.5.127 broadcast address
255.255.255.128 = netmask address
192.168.5.1 = first usable 
192.168.5 126 = last usable 
126 total host usable

Lan1
192.168.5.128/26 (/26 = 62 hosts)
192.168.5.1000 0000 = 192.168.5.128 network address
192.168.5.1011 1111 = 192.168.5.191 broadcast address
255.255.255.192 = netmask address
192.168.5.129 = first usable 
192.168.5.190 = last usable
62 total host usable

Lan3 
192.168.5.192/28 (/28 = 14 hosts)
192.168.5.1100 0000 = 192.168.5.192 network address
192.168.5.1100 1111 = 192.168.5.207 broadcast address
255.255.255.240 = subnet mask
192.168.5.193 = first usable
192.168.5.206 = last usable
14 total host usable

Lan4
192.168.5.208/28 (/28 = 14 hosts)
192.168.5.1101 0000 = 192.168.5.208 network address
192.168.5.1101 1111 = 192.168.5.223 broadcast address
255.255.255.240 = subnet mask
192.168.5.209 = first usable
192.168.5.222 = last usable
14 total host usable

Lan5
192.168.5.224/30 (/30 = 2hosts)
192.168.5.1110 0000 = 192.168.5.224 network address
192.168.5.1110 0011 = 192.168.5.227 broadcast address
255.255.255.252 = subnet mask
192.168.5.225 = first usable
192.168.5.226 = last usable
2 total host usable

Router 1

Interface 1

en
conf t
do show ip int brief

int g0/1
ip add 192.168.5.126 255.255.255.128
desc ## to SW2 ##

do show ip int brief

Then just open up the connection

no shutdown

PC 2

config

ROUTER 1

Interface 0

int g0/0
ip add 192.168.5.190 255.255.255.192
desc ## to SW1 ##
no shut

do show ip int brief

PC1

Change the subnet mask

0 to 192
since its /26

192.168.5.129

1111 1111.1111 1111.1111 1111.1100 0000 = 255.255.255.192 subnet

ROUTER 2

INTERFACE 0

en
conf t
do show ip int brief
int g0/0
ip add 192.168.5.206 255.255.255.240
desc ## to SW3 ##
no shut

do show ip int brief

PC 3

config

CHANGE THE SUBNET MASK

from 0 to 240

255.255.255.0 ----> 255.255.255.240

INTERFACE 1

ROUTER 2

int g0/1
ip add 192.168.5.222 255.255.255.240
desc ## to SW4 ##
no shut

do show ip int brief

PC 4

config

255.255.255.0 -----> 255.255.255.240

ROUTER 1

INTERFACE 0/0/0

en
conf t
do show ip int brief

int g0/0/0
ip add 192.168.5.225 255.255.255.252
desc ## point to point ##
no shut

do show ip int brief

ROUTER 2

INTERFACE 0/0/0

int g0/0/0
ip add 192.168.5.226 255.255.255.252
desc ## point to point ##
no shut

do show ip int brief

---

CONFIGURE NOW THE ROUTER 2 FOR THEM TO CONNECT ALL

ROUTER 2

ip route 192.168.5.0 255.255.255.128 192.168.5.225
ip route 192.168.5.128 255.255.255.192 192.168.5.225

do show ip route

ROUTER 1

ip route 192.168.5.192 255.255.255.240 192.168.5.226
ip route 192.168.5.208 255.255.255.240 192.168.5.226

do show ip route

---

NOWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW WE ARE NOW ABLE TO CONNECT ALL

PING COMMAND LETS GO

PC 1 ----> PC 2 , PC 3 , PC 4