Subnetting
Brain_Power
Users Awaiting Email Confirmation Posts: 163
in CCNA & CCENT
Check my subnetting.
126.0.2.99 /24
Net ID IP: 126.0.2.0
1st Valid IP: 126.0.2.1
Last Valid IP: 126.0.2.254
Broadcast IP: 126.0.2.255
155.44.2.2 /21
Net ID IP: 155.44.0.0
1st Valid IP: 155.44.0.1
Last Valid IP: 155.44.7.254
Broadcast IP: 155.44.7.255
126.0.2.99 /24
Net ID IP: 126.0.2.0
1st Valid IP: 126.0.2.1
Last Valid IP: 126.0.2.254
Broadcast IP: 126.0.2.255
155.44.2.2 /21
Net ID IP: 155.44.0.0
1st Valid IP: 155.44.0.1
Last Valid IP: 155.44.7.254
Broadcast IP: 155.44.7.255
Comments
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NetworkVeteran
Member Posts: 2,338 ■■■■■■■■□□
No, that's actually the Subnet ID. The Network ID would be 126.0.0.0.Net ID IP: 126.0.2.0
No, 126.0.2.0 is the first valid IP address in that range. 126.0.2.1 is the first host address.1st Valid IP: 126.0.2.1
No, 126.0.2.255 is the last valid IP address in that range. 126.0.2.254 is the last host address.Last Valid IP: 126.0.2.254
Yes.Broadcast IP: 126.0.2.255 -
chopsticks
Member Posts: 389
NetworkVeteran wrote: »No, that's actually the Subnet ID. The Network ID would be 126.0.0.0
May I ask how do you arrive at this? Thanks. -
NetworkVeteran
Member Posts: 2,338 ■■■■■■■■□□
chopsticks wrote: »May I ask how do you arrive at this? Thanks.
It'd take a some time to explain the intricacies, but here are the broad steps in the process--
1. The first number an IP address determines its class. "126" maps to a Class A.
2. Class A addresses have a network mask of 255.0.0.0.
3. 126.0.2.99 & 255.0.0.0 = 126.0.0.0.
4. 126.0.0.0 is the Network ID.
Consult a good book on subnetting for more detail or Google the same.
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chopsticks
Member Posts: 389
NetworkVeteran wrote: »It'd take a some time to explain the intricacies, but here are the broad steps in the process--
1. The first number an IP address determines its class. "126" maps to a Class A.
2. Class A addresses have a network mask of 255.0.0.0.
3. 126.0.2.99 & 255.0.0.0 = 126.0.0.0.
4. 126.0.0.0 is the Network ID.
Consult a good book on subnetting for more detail or Google the same.
Thank you, I fully understood your explanation.
I asked this question is because most books stopped at arriving at the Subnet ID.