vaild IP address

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

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Comments

wbosher

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.

gothiclong

I agree it is a valid IP address.

scout249

Thanks for helping.

johnwest43

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.

wbosher

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.

networker050184

wbosher wrote: »

Fingers crossed...hope I'm right.

Close but no cigar

http://tools.ietf.org/rfc/rfc3021.txt

wbosher

Interesting...that little gem about the 31 bit mask wasn't in any CCNA doco that I've read.

JaCkNiFe

networker050184 wrote: »

http://tools.ietf.org/rfc/rfc3021.txt

Thanks for this! Great bit of info.

johnwest43

you even get a warning message from the cisco ios when you configure an interface with a /31. try it its neat!!

sxzaq1

wbosher wrote: »

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

tech-airman

scout249,

scout249 wrote: »

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?

scout249 wrote: »

10.255.255.255 is broadcast address.

Why is this the broadcast address?

scout249 wrote: »

is 10.0.1.255/8 a valid IP address ?

Applying the subnet mask to that IP address, what is the network address?

scout249 wrote: »

Can i use this address on any device ?

Let's wait until you've confirmed that it is a valid IP address.

scout249 wrote: »

Thanks