Index

COMPUTER NETWORKING

  1. INTRO
    1. TCP/IP Five Layer Model
    2. NETWORKING DEVICES
    3. PHYSICAL LAYER
    4. DATALINK LAYER
  2. NETWORK LAYER
    1. IP
    2. SUBNET
    3. ROUTING
  3. TRANSPORT & APPLICATION LAYER
    1. TRANSPORT LAYER
    2. CONTROL FLAGS
    3. APPLICATION LAYER
    4. ALL TOGETHER
  4. NETWORK SERVICES
    1. DNS - NAMES RESOLUTION
    2. DHCP
    3. NAT
    4. VPN
  5. CONNECTING TO INTERNET
    1. BROADBAND
    2. WAN
    3. WIRELESS NETWORKING
  6. TROUBLESHOOTING
  7. MORE ABOUT
    1. DNS
    2. IPv6
    3. CLOUD

SUBNET

Subnetting : The process of taking a large network and splitting it up into many individual and smaller sybnetworks, or subnets.
Subnet masks : 4 octects in decimal
For IP address -> 9.100.100.100
IP Address IP (binary) Subnet MASK
90000 10011111 1111
1000110 01001111 1111
1000110 01001111 1111
1000110 01000000 0000
Host ID
Host id

IP/no. of ones


Binary Math :

8 bit -256 number (0-255)
4 bit - 16

CIDR : Classless inter domain routing
Demarcate : where one network ends and other begins
only two individual ids
9.100.100.100
255.255.255.0
9.100.100.100/24
CIDR -> 255.255.254