CCNA and CCNP training in your home : Bangalore

Dear all,

We provide CCNA and CCNP training in your home only in Bangalore.

Please contact : V.Ramar - 9538162193

Subnetting : CCNA

Ip Address : 32 bit.

Example :

Ip Address - 192.168.0.1 - 11000000.10101000.00000000.00000001
Subnet mask - 255.255.255.0 - 11111111.11111111.11111111.00000000

In subnetting, subnet mask is very important.  All 1's are network bit(it is remain same for entire network). All0's  are host bit( assign to host)

So, first 24 bit is your network bit. only last eight bit for Host. Your network range is 192.168.1.0 to 192.168.1.255 (Total 256 ip address including 0 and 255)

192.168.1.0 - This is Network Id
192.168.1.1 - This is the First valid in your network
.
.
.
.
192.168.1.254 - This is the last valid ip in your network
192.168.1.255 - This is the broadcast ip.


Total 256 ip's, first one is network id and last one is Broadcast. These two ip address you can not assign to you pc. So total valid ip in this network is 254. (192.168.1.1 - 192.168.1.254)

Decimal to binary calculation
192/2=96 - remaining 0
96/2=48 - remaining 0
48/2=24 - remaining 0
24/2-12 - remaining 0
12/2=6 - remaining 0
6/2=3 - remaining 0
3/2=1 - remaing 1

Now you write from bottom to top = 11000000



Binary to decimal calcularion

128  64  32 16  8   4   2   1
 1     1    0    0   0   0   0   0

Now leave all the 0 values and add only the 1 values = 128 & 64 have 1's and remaining all bits are zero. So 128+64 = 192.

If any doubt, please write comment...

CCNA Switching

Question : Why Mac address “Sticky” used in port-security?

Answer : If you ignore the sticky keyword, the statically configured mac-addresses will be lost on reboot. When sticky learning is enabled, the interface adds all secure MAC addresses that are dynamically learned to the running configuration and converts these addresses to sticky secure MAC addresses.