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Subnet sorrow
celtic_tiger
Member Posts: 41 ■■□□□□□□□□
in CCNA & CCENT
Hi all
Im finishing off the subnetting chapter on the cisco press book and I can do all the excercises on the book now i just need to understand how to interpret the answers i get.
This could be a dumb question but.
lets say I get the ip 10.100.18.18 255.248.0.0
I can get the:
subnet no. 10.96.0.0
1st usable ip 10.96.0.1
last usable 10.103.255.254
broadcast 10.193.255.255
So does that mean the ip address spans subnet 10.96.0.1 + subnet 10.97.0.1 and so on up to and including 10.103.255.255
meaning that this ip occupies 7 different subnets!!
Im finishing off the subnetting chapter on the cisco press book and I can do all the excercises on the book now i just need to understand how to interpret the answers i get.
This could be a dumb question but.
lets say I get the ip 10.100.18.18 255.248.0.0
I can get the:
subnet no. 10.96.0.0
1st usable ip 10.96.0.1
last usable 10.103.255.254
broadcast 10.193.255.255
So does that mean the ip address spans subnet 10.96.0.1 + subnet 10.97.0.1 and so on up to and including 10.103.255.255
meaning that this ip occupies 7 different subnets!!
Comments
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Optionsmiller811 Member Posts: 897celtic_tiger wrote: »Hi all
Im finishing off the subnetting chapter on the cisco press book and I can do all the excercises on the book now i just need to understand how to interpret the answers i get.
This could be a dumb question but.
lets say I get the ip 10.100.18.18 255.248.0.0
I can get the:
subnet no. 10.96.0.0
1st usable ip 10.96.0.1
last usable 10.103.255.254
broadcast 10.193.255.255
So does that mean the ip address spans subnet 10.96.0.1 + subnet 10.97.0.1 and so on up to and including 10.103.255.255
meaning that this ip occupies 7 different subnets!!
no it means exactly exactly what you described below minus the typo
1st usable ip 10.96.0.1
last usable 10.103.255.254
broadcast 10.103.255.255
that is the subnet (one and only) and includes those addresses.
Even though is moves through the
10.96
10.97
10.98
10.99
10.100
10.101
10.102
10.103
it is still in the same subnet
/13 for the network portion and a /19 for the host bits.
which means that there are 524288 hosts in the subnet 10.96.0.0
with an address range that big, it could be further subnetted if desired, but the question at hand is to be able to identify and understand the question at hand.
hope that helps
have you looked at this link?
http://www.techexams.net/forums/ccna-ccent/38772-subnetting-made-easy.html
test your skills here
IP Subnet Practice
click the new problem button and then solve the question.
repeat, repeat, repeat
Your goal is to be able to subnet in your head when you finish.I don't claim to be an expert, but I sure would like to become one someday.
Quest for 11K pages read in 2011
Page Count total to date - 1283 -
Optionscomptech+ Member Posts: 1 ■□□□□□□□□□Re: previous question. If you are starting with the address 10.0.0.0 255.0.0.0 and you need 7 subnets. Your addresses will be 10.0.0.0 - 10.30.255.254 and a broadcast of 10.31.255.255 then the next network of 10.32.0.0 - 10.62.255.254 with a broadcast of 10.63.255.255 then the next network of 10.64.0.0 - 10.94.255.254 with a broadcast of 10.95.255.255 and so forth. All the way up to 10.224.0.0, so your ranges would be 10.0.0.0/27 10.32.0.0/29 10.64.0.0/27 10.96.0.0/27 10.128.0.0/27 10.160.0.0/27 10.192.0.0/27 10.224.0.0/27 and the subnet mask of 10.224.255.255 I think this is your answer.
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Optionsthenjduke Member Posts: 894 ■■■■□□□□□□Miller is right when comes to this problem. Remember the broadcast address is the next ip before the next subnet.no it means exactly exactly what you described below minus the typo
1st usable ip 10.96.0.1
last usable 10.103.255.254
broadcast 10.103.255.255
that is the subnet (one and only) and includes those addresses.
Even though is moves through the
10.96
10.97
10.98
10.99
10.100
10.101
10.102
10.103
it is still in the same subnet
/13 for the network portion and a /19 for the host bits.
which means that there are 524288 hosts in the subnet 10.96.0.0
with an address range that big, it could be further subnetted if desired, but the question at hand is to be able to identify and understand the question at hand.
hope that helps
have you looked at this link?
http://www.techexams.net/forums/ccna-ccent/38772-subnetting-made-easy.html
test your skills here
IP Subnet Practice
click the new problem button and then solve the question.
repeat, repeat, repeat
Your goal is to be able to subnet in your head when you finish.CCNA, MCP, MCSA, MCSE, MCDST, MCITP Enterprise Administrator, Working towards Networking BS. CCNP is Next. -
Optionsceltic_tiger Member Posts: 41 ■■□□□□□□□□Thanks for the replies.
So I think that lets say there are x amount of subnets created with this mask and then this ip 10.103.18.18 /14 is located within the block of ip's below which is one of those subnet ranges?
10.96
10.97
10.98
10.99
10.100
10.101
10.102
10.103
Am I right? -
Optionsmiller811 Member Posts: 897celtic_tiger wrote: »Thanks for the replies.
So I think that lets say there are x amount of subnets created with this mask and then this ip 10.103.18.18 /14 is located within the block of ip's below which is one of those subnet ranges?
10.96
10.97
10.98
10.99
10.100
10.101
10.102
10.103
Am I right?
Not sure if you are grasping it....
once the mask becomes a /14 or .252, the block size is now only 4 bits....
so with the address 10.103.18.18 /14 it resides on the 10.100.0.0 subnet
first host 10.100.0.1
last host 10.103.255.254
broadcast 10.103.255.255
next available subnet starts at
10.104.0.0
10.108.0.0
10.112.0.0
10.116.0.0I don't claim to be an expert, but I sure would like to become one someday.
Quest for 11K pages read in 2011
Page Count total to date - 1283 -
Optionsceltic_tiger Member Posts: 41 ■■□□□□□□□□Ah I see it now, just re read your first post after a nights sleep. 1 subnet & multiple ip addresses per subnet. No of subnets depends on the subnet bits in mask.
Dont know why i could'nt se that before. Some days my head just doesnt work.
Thanks.