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Home > Archive > CCDA/CCDP > March 2002 > The .252 mask ?
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| Maybe someone can explain this to me. From the CID exam cert guide by Crane pg 159-162.
It has a table that lists available networks and available addresses for the .252 mask. I thought that the only host addresses available was 253 and 254. The table shows multiple network addresses and available addresses for the .252 mask. What am I missing?
tia
ea | |
| dmaftei 2002-03-12, 7:11 pm |
| I assume "the .252 mask" means 255.255.255.252. If you subnet a class C with this mask you get 64 subnets, with four address per subnet. For each subnet the first address is the subnet address, the last one is the broadcast address, and the two left are host addresses.
Say you have 192.168.0.0 255.255.255.252. Here are the subnets:
192.168.0.0
192.168.0.4
192.168.0.8
...
192.168.0.248
192.168.0.252
Take subnet 192.168.0.8. The subnet address is 192.168.0.8, the broadcast address is 192.168.0.11, the (two) host addresses are 192.168.0.9 and 192.168.0.10. Makes sense?
BTW, that's a great signature.  Where did you find it? | |
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| quote:
Originally posted by dmaftei
....192.168.0.0 255.255.255.252.
BTW, that's a great signature. Where did you find it?
Thanks Dan.
Man, I feel soooo stupid. Once I saw the address and mask side by side, it made sense. How's that for natural stupidity ?
I heard that saying on the radio. The DJ was quoting from a source, that at the moment I can't recall. I thought it was a great play on words.
Thanks again
ea
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| chodan 2002-03-16, 5:04 pm |
| 255.255.255.252 is the preffered sn mask for assigning serial links. | |
| sirisak.c 2002-03-18, 10:24 am |
| be careful that you're running classless routing protocol also.
if you are running classful routing protocol (RIPv1,IGRP) your routers can not communicate to any others. |
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