sorry if it is, but what the hell, i'll ask just in case someone out there might know:
if you understand the concepts of network addressing, such as classful vs clasless ...read on, if not, don't bother.
if you are given a network to assign addresses ok.....using VLSM CIDR....
for one thing you are given the address 172.16.1.0 /28 to assign for WAN serial links and you need to subnet it ok?
your first subnet is going to be prefix /29, you have a binary address of 10101100.00010000.00000001.00000000
your mask is 11111111.11111111.11111111.11111000
if you had to assign 3 disparate wan network links....would you take that first /29 with the 255.255.255.248 mask and use that for one of the networks, that is all you can do right? then goto /30 for the next network, leaving you with /31 for the last network which only gives you a point to point connection (2 addresses total).....
my confusion is, it seems there is more that you can do here, but i don't see it. i can just arbitrarily change network bits to suit my needs as long as i don't assign hosts outside of the last 4 bits? something i'm missing because i'm looking at one topology
that is using the /30 mask with a 192.168.10.0 network ..and assigned 192.168.10.4 as one network on one serial wan link, and then goes and assigns 192.168.10.8 /30 to another serial wan link connected to the first...where is this leeway coming from for addressing when using /30, it is only 2 bits...
if you understand the concepts of network addressing, such as classful vs clasless ...read on, if not, don't bother.
if you are given a network to assign addresses ok.....using VLSM CIDR....
for one thing you are given the address 172.16.1.0 /28 to assign for WAN serial links and you need to subnet it ok?
your first subnet is going to be prefix /29, you have a binary address of 10101100.00010000.00000001.00000000
your mask is 11111111.11111111.11111111.11111000
if you had to assign 3 disparate wan network links....would you take that first /29 with the 255.255.255.248 mask and use that for one of the networks, that is all you can do right? then goto /30 for the next network, leaving you with /31 for the last network which only gives you a point to point connection (2 addresses total).....
my confusion is, it seems there is more that you can do here, but i don't see it. i can just arbitrarily change network bits to suit my needs as long as i don't assign hosts outside of the last 4 bits? something i'm missing because i'm looking at one topology
that is using the /30 mask with a 192.168.10.0 network ..and assigned 192.168.10.4 as one network on one serial wan link, and then goes and assigns 192.168.10.8 /30 to another serial wan link connected to the first...where is this leeway coming from for addressing when using /30, it is only 2 bits...