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vaild IP address
scout249
Registered Users Posts: 2 ■□□□□□□□□□
in CCNA & CCENT
Hi All.
I am reading sybex study guide, and a bit confus about IP address
each class A address has 24bit for the node address of a machine. this mean there are 2^24 unique address.
10.0.0.0 is network address
10.255.255.255 is broadcast address.
is 10.0.1.255/8 a valid IP address ? Can i use this address on any device ?
Thanks
I am reading sybex study guide, and a bit confus about IP address
each class A address has 24bit for the node address of a machine. this mean there are 2^24 unique address.
10.0.0.0 is network address
10.255.255.255 is broadcast address.
is 10.0.1.255/8 a valid IP address ? Can i use this address on any device ?
Thanks
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wbosher
Member Posts: 422
Yes, using the class A mask of /8 or 255.0.0.0, you are correct.
10.0.0.0 is network address
10.255.255.255 is broadcast address
The above two address are the only ones you can't use. Anything between these two (including 10.0.1.255) can be used on any device in this network. -
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johnwest43
Member Posts: 294
yup its valid. Now for a quick test.
Would 10.0.1.255 be a valid host on the networks:
10.0.0.0/16?
10.0.0.0/23?
10.0.1.254/31?
These types of questions are great practice for studying and for the exams.CCNP: ROUTE B][COLOR=#ff0000]x[/COLOR][/B , SWITCH B][COLOR=#ff0000]x[/COLOR][/B, TSHOOT [X ] Completed on 2/18/2014 -
Optionswbosher
Member Posts: 422
10.0.0.0/16 - Yes
10.0.0.0/23 - No, broadcast address
10.0.1.254/31 - No, silly mask that no one would use. There are no valid addresses using this mask.
Fingers crossed...hope I'm right. -
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networker050184
Mod Posts: 11,962 Mod
An expert is a man who has made all the mistakes which can be made. -
Optionswbosher
Member Posts: 422
Interesting...that little gem about the 31 bit mask wasn't in any CCNA doco that I've read.
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JaCkNiFe
Member Posts: 96 ■■□□□□□□□□
networker050184 wrote: »
Thanks for this! Great bit of info.Lab on! -
Optionsjohnwest43
Member Posts: 294
you even get a warning message from the cisco ios when you configure an interface with a /31. try it its neat!!CCNP: ROUTE B][COLOR=#ff0000]x[/COLOR][/B , SWITCH B][COLOR=#ff0000]x[/COLOR][/B, TSHOOT [X ] Completed on 2/18/2014
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Optionssxzaq1
Member Posts: 20 ■□□□□□□□□□
Interesting...that little gem about the 31 bit mask wasn't in any CCNA doco that I've read.
Watch this video, also, this is video 7 of 9, they are all great for learning subnetting.
YouTube - Cisco Training CCNA IP Addressing - Part 7
You'll learn what a rooter is. lol -
Optionstech-airman
Member Posts: 953
scout249,Hi All.
I am reading sybex study guide, and a bit confus about IP address
each class A address has 24bit for the node address of a machine. this mean there are 2^24 unique address.
10.0.0.0 is network address
Why is this the network address?10.255.255.255 is broadcast address.
Why is this the broadcast address?is 10.0.1.255/8 a valid IP address ?
Applying the subnet mask to that IP address, what is the network address?Can i use this address on any device ?
Let's wait until you've confirmed that it is a valid IP address.
Thanks
