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sssr
Joined: 29 Nov 2004
Posts: 16
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 26 Apr 2006 5:04 IP and Subnet |
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Hi
Can anyone help me with this problem
I'm given a Subnet mask of 255.255.240.0
I have to identify the network class, subnet and the node for the
IP address 142.56.130.78.
I know its class B.
Is the node part x.x.240.0?
Can anyone tell me what the subnet is.
Thanks
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vinci.
Joined: 26 Apr 2006
Posts: 15
Location: south P
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| 26 Apr 2006 6:29 Re: IP and Subnet |
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for class B We have:
net: 255.xxx.xxx.xxx
subnet: xxx.255.xxx.xxx
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throwaway18
Joined: 09 Jun 2005
Posts: 553
Helped: 73
Location: Kent, UK
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| 26 Apr 2006 7:53 IP and Subnet |
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>I'm given a Subnet mask of 255.255.240.0
It dosn't have a network class. The old class A/B/C sytem was
replaced by CIDR (classless inter domain routing) years ago though
lot of people continue to repeat out of date information.
255.255.240.0 is a /20 network block.
>I have to identify the network class, subnet and the node for the
>IP address 142.56.130.78.
The block of ip addreses containing 142.56.130.78/20 is
142.56.128.0 to 142.56.143.255
I'm not sure what you mean by node. To me a node is an individual
machine so the node is the machine which has that ip address.
>I know its class B.
It is not a class B. A class B block of ip addresses has a subnet mask
of 255.255.0.0
>for class B We have:
>net: 255.xxx.xxx.xxx
Completly wrong. That is an old class A block, now called a /8
>subnet: xxx.255.xxx.xxx
That is not a valid subnet mask.
Added after 15 minutes:
Incidentally that ip address is part of a class B allocation however the network administrator can divide the ip space into smaller blocks as he sees fit for different LAN's/buildings/offices.
OrgName: Alberta Energy Company Limited
Address: 1800, 855-2nd Street S.W.
City: Calgary
NetRange: 142.56.0.0 - 142.56.255.255
CIDR: 142.56.0.0/16
NetName: AECNET
NetHandle: NET-142-56-0-0-1
Parent: NET-142-0-0-0-0
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sssr
Joined: 29 Nov 2004
Posts: 16
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| 26 Apr 2006 9:07 Re: IP and Subnet |
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Thanks for the replys
This is for an assignment so its just a made up address. throwaway18 I have to do it using the old system. By node I think it the same thing as saying host.
thanks
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