So what about the following 10.0.0.1/24? Well that would represent 10.0.0.1 - 10.0.1.0 right? Wrong. So what does that mean? Well it represents the 256 addresses 10.0.0.0 - 10.0.0.255. An IP address in CIDR notation looks like this: 10.0.0.0/24 with the CIDR part being the /24. CIDR or Classless Inter-Domain Routing is a notation and method for dividing and allocating IP address ranges and subnets. I am going to start the explanation of this somewhat backwards to a lot of other documentation with "CIDR notation". But, what if we were to make this number much larger and try to subdivide it into many more networks? What if the networks weren't evenly divided? How would you identify which address belonged to which network or subnetwork? Without looking at all the addresses, how would you know where one starts and ends?Įnter the subnet mask. We can see fairly clearly which addresses belong to which group. If we wanted to split this in half, we would have 2 networks of 4 addresses, the first and that's fine for this very simple network and its two subnetworks. Lets say we have a network consisting of only 8 addresses numbered 1 - 8. If we think about what we are trying to achieve more simply, all we want to do is take a network with x addresses and divide it into multiple smaller networks. I am going to attempt to explain the concept in a slightly different way and then explain the mechanics and notation. This may sound complicated and because of the way it is often explained with bitwise operations and binary from the start, it can seem confusing. One of the key components for dividing and identifying subnets is the "subnet mask" or "netmask". They can also be divided for security and access purposes as well as many other reasons. Subnets can be used to separate networks logically for different purposes such as business functions like Accounts Network, Sales Network etc. Subnets are subnetworks, meaning a network divided into multiple smaller networks. You may have come across the term "subnet". It is like a phone number and identifies a node on a given network. Each address in an IP network must be unique. This results in a total of 4,294,967,296 IP addresses. 11111111įor a brief introduction to binary click here This means a range of binary numbers like so: 0. So what does that represent? It actually represents four 8 bit numbers ranging from 0 (binary 00000000) to 255 (binary 11111111). What is an IP address? You will no doubt have seen IP addresses many times. In IP networking this comes in the form of an IP address. You may wish to send a message to everyone on the network, in the same way you may wish to send a circular to multiple recipients, but you are also likely to want to send messages to a specific recipient.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |