VLSM and subnetting IT Network

Introduction to VLSM and subnetting IP addresses in IT Network for beginners

In this Blog tutorial I want to get close beginners layman language to conjure up the VLSM (Variable Length Subnet Mask), RFC 1878 (rfc.net/rfc1878.html) and subnetting (division) IP addresses. All the texts on this blog can help you as you plan to lay CISCO - CCNA certification. Standard IPv4 protocol (www.ietf.org/rfc/rfc0791.txt) uses a 32-bit number in the header of IP packets in dotted-decimal notation looks like this example:

Content of this Blog

  1. VLSM and Subnetting - Content
  2. IP address in dotted and binary format
  3. The weight value of Bits in one Byte
  4. Public and Private IP address classes range
  5. Network masks and classfull addressing
  6. Total Host and Usable Host
  7. Calculation AND-ing calculation in VLSM
  8. Router AND-ing between IP addresses and Network Mask
  9. Why do we use VLSM?
  10. Subnetting IP and Borrowed Bits
  11. Borrowed Bits and Variable Length Subnet Mask
  12. Hierarchical view of Subnet IP address
  13. Subnetting IT Network
  14. CIDR format and borrowed bits
  15. Subnetting and Borrowed Bits graphic view
  16. Subnetting table for C class IP addresses
  17. Computers Networks Topologies
  18. The basic configuration of Cisco Router - CCNA 
  19. The basic configuration of Cisco Switch - CCNA 
  20. Two ADSL lines - Two Routers - One LAN Network
  21. Modes Configuration Cisco IOS 
  22. Explanation Encapsulation Process 
  23. Calculating the IP Broadcast address
  24. Configure RIPv1. Routing protocol on the router 
  25. Configuring IGRP Routing protocol on the router
  26. Switching Routing with RIPv1 to IGRP Routing Protocol 
  27. Connecting to a remote Router via Telnet connection 
  28. Configuring Inter-VLAN Routing on the Cisco Switch
  29. VTP Client and Server Configuration on the Switch
  30. ISL Trunking on the Cisco Switch
  31. Create and Delete VLAN on Switch
  32. Create new VLAN and move Interfaces into new VLAN
  33. Configuration Static VLANs
  34. Spanning-Tree Recalculation on Switch
  35. Selecting The Root Bridge Switch
  36. Password Recovery Procedure on Switch
  37. Managing The Switch Operating Sistem File IOS
  38. Configure Port Security on Switch
  39. Managing The Startup Configuration File
  40. Configure EIGRP, Frame Relay, PPP, NAT, DHCP between the routers (complete tutorial)
  41. Basic Settings Router serie 1721
  42. Configuration Router 'Bjelovar'
  43. Configuration Router 'Rijeka'
  44. Configuration Router 'Zadar'
  45. Configuration Frame Relay
  46. Configuration PPP encapsulation
  47. Configuration EIGRP routing
  48. Configuration DHCP service
  49. Configuration NAT
  50. Configuration Static Routes on Router
  51. Verify Connectivity between Routers
I will try to briefly explain the notation of IP addresses. To the two computers communicating via the Internet network, the computer must have its own IP address and network mask, but not only that, they need a path to the destination ie. Routes. (this is not the case in a local area network (LAN) when multiple computers networked via a hub or switch).
To continue, lets go to next page, please click on the link number 2.