Subnetting

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Subnetting

  1. 1. SUBNETTING IT’S A PROCESS OF DIVIDING A SINGLE NETWORK INTO MULTIPLE NETWORKS. THIS IS DONE BY CONVERTING HOST’S BITS INTO NETWORK’S BITS (i.e. Converting 0’s into 1’s). IT IS ALSO CALLED FLSM. IT CAN BE DONE IN THREE WAYS: Requirement of network. Requirement of hosts. Cisco / notation. A SUBNET MASK IS ALWAYS A COMBINATION OF CONTIGUOUS 1’s AND 0’s. VALID SUBNET MASKS IN EACH OCTET ARE: 0, 128, 192, 224, 240, 248, 252, 254, 255.
  2. 2. REVERSE ENGINEERINGSECNARIO 1 IP ADD : 192.168.1.127 / 27SECNARIO 2 IP ADD : 172.16.68.65 SUBNET MASK : 255.255.255.240 DEFAULT GATEWAY : 172.16.68.62
  3. 3. VLSM A VLSM IS A MEANS OF ALLOCATING IP ADDRESSING RESOURCES TO SUBNETS ACCORDING TO THEIR INDIVIDUAL NEED RATHER THAN SOME GENERAL NETWORK WIDE RULE. VLSM ALLOWS AN ORGANISATION TO USE MORE THAN ONE SUBNET MASK WITHIN THE SAME NWTWORK ADDRESS SPACE. IT IS REFERRED TO AS “SUBNETTING A SUBNET” AND CAN BE USED TO MAXIMIZE ADDRESSING EFFICIENCY. LARGER SUBNETS ARE CREATED FOR ADDRESSING LAN’s AND SMALL SUBNETS FOR WAN LINKS (e.g. a 30 bit subnet mask is used to create subnet with only two hosts).
  4. 4. SUBNETTING vs VLSMSUBNETTING ALLOWS YOU TO DIVIDE BIG NETWORK INTO SMALLER EQUAL SIZED SLICES.VLSM ALLOWS YOU TO DIVIDE BIG NETWORK INTO SMALLER, DIFFERENT-SIZED SLICES. THIS ALLOWS YOU TO MAKE MAXIMUM USE OF THE VALUABLE ADDRESS SPACE.
  5. 5. ADVANTAGES OF SUBNETTINGREDUCED NETWORK TRAFFICOPTIMIZED NETWORK MANAGEMENTSIMPLIFED NETWORK MANGEMENT

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