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about subnet

By hari19580 ·
can any body answer me what is a subnet is?

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about subnet

by kernow_boy In reply to about subnet

Subnetworks are networks arbitrarily segmented by a network administrator in order to provide a multilevel, hierarchical routing structure while shielding the subnetwork from the addressing complexity of attached networks. Sometimes called a subnet.

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about subnet

by hari19580 In reply to about subnet

i can't understand u

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about subnet

by R. A. Caluste In reply to about subnet

You make use of subnet to divide your large network (Class A-C) into two or more smaller networks. This is done so because whenever your computer performs a broadcast ( for example to query a netbios name ), it sends out packets of data to all computers in the network. so if you have only 1 _big_ segment, and each computer is sending out broadcast, you generate alot of traffic. To manage this, you divide your big network into smaller networks wherein broadcasts are confined to their segment. routers are placed in between segments (subnets) so that computers from one subnet can communicate with computers in another subnet. this routers are oftentimes called gateways. subnet masks are applied to ip addresses to determine which subnet a particular address belong.

hope this helps.

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about subnet

by hari19580 In reply to about subnet

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by tracertheart In reply to about subnet

You are dividing your single network into Multiple logical network by using subnet.
For outside it appears a single network.but internally there is a logical sub divided networks.

Subnet ID is used to identify which portion of Ipaddress is Network ID,Sunnetworkid and host id

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about subnet

by hari19580 In reply to about subnet

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about subnet

by BenWagg In reply to about subnet

In the US, we have a network of highways known as Interstates, because they cross state lines. I-75 runs north/south through the several states between Florida(south) & Michigan(north). I-95 runs north/south between Florida and New York.

They are intersected by I-4 within Florida, I-10 at the north end of Florida, I-20, I-30, I-40, etc. somewhere up the line. Hence, a "net"work.

I can get to Atlanta(GA) on I-75, and I can get to Orlando(FL) on I-4. But I can't get to Clearwater on either. Florida has its own network of roads in addition to the Federal Interstate highway system. State Road 60 intersects I-75 and leads west to Clearwater, so I can take I-75 to SR60 and end up in the town I want to.

Within Florida, the Counties haveadditional networks of smaller roads, so if I wanted to get to Fred's house in Clearwater, I would look for the intersection of SR60 and CR1, then find his house number of 9999 (fictitious). So, if I were to write Fred's house "IP" address as Interstate.State.County.House, it might be I75.SR60.CR1.9999.

Fred and all his neighbors live in the SUBNET, then, of I75.SR60.CR1.xxxx, whereas all the businesses I drove past on SR60 are in the SUBNET of I75.SR60.xxx.xxxx. This is not an exact example, but it hints at the concept.

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about subnet

by BenWagg In reply to about subnet

The subnet is a means of organizing computer addresses so that you can communicate with the one(s) you want to. Routers determine which subnet to connect to by using a "subnet mask."

To further refine my "roads" analogy, the subnet mask indicatesto the router how much of the address is street name and what portion is house address. You and I may share the same address, 123456789. Our subnet "mask", though, will tell the postman where to bring our mail. If you have streetnet mask SSSS.HHHHH and I have streetnet mask SSSSSS.HHH, then the postman will know that you live on 1234 Street in House# 56789, and I live on 123456 Street in House# 789.

Now, you have a computer network containing four computers with IP addresses 10.10.10.10 - 10.10.10.13, and your subnet "mask" is 255.255.255.0.

My computer network contains four computers with addresses 10.10.10.10 - 10.10.10.13, but my subnet "mask" is 255.0.0.0.

Fred has four with addresses 10.10.11.10 - 10.10.11.13, and subnet mask255.0.0.0.

Routers read the mask as 255=Network, 0=Computer. So, your #1 computer's address is interpreted to mean you have computer 10 on network 10.10.10. My #1 computer's address is interpreted as computer 10.10.10 on network 10, and Fred's #1 computer is 10.11.10, also on network 10.

Fred and I can communicate with each other, but we can't talk to your network. We live on a different street.

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by hari19580 In reply to about subnet

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