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Home > Archive > CCNA > April 2004 > IP addressing question
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IP addressing question
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| repentantvoter 2004-04-27, 10:06 pm |
| I have found the following question in a practice test:
Which of the following is a valid representation of class C network numbers range?
1. 1.0.0.0 to 126.0.0.0
2. 128.1.0.0 to 191.254.0.0
3. 192.0.1.0 to 223.255.254.0
4. 0.0.0.0 to 126.0.0.0
5. 128.0.0.0 to 191.255.0.0
6. 192.0.0.0 to 255.255.255.0
I am reading in one of my books that class C networks range from 192.0.0.0 through 223.255.255.0, but I do not see that amongst the choices! Quite peculiar indeed! Do you, ladies and gentlemen, think the question, the answers rather, are wrong? Or is it that I am missing something very obvious (it would not be the first time  )? | |
| perfectionist 2004-04-27, 11:33 pm |
| Good qeustion !!
The answer is 3. 192.0.1.0 to 223.255.254.0..
Why?? Simple.. because both network address 192.0.0.0, and network address 223.255.255.0 are reserved. | |
| ASnowy 2004-04-28, 4:47 am |
| I agree with perfectionist, but... let me make a few confidence:
RFC 1812 now permits the use of all-zeros and all-ones subnets in a CIDR-compliant environment(use modern routing protocols). Microsoft's TCP/IP stack allows it, but is extremely recommended not to use if you aren't definitely that all of the software in the network recognize this convention.
Otherwise, I realize that option 6 is the specification of the first number of the Class C Network ID's range [192.0.0.0 to 223.255.255.0] and its corresponding subnet mask [255.255.255.0]
So, from the six answers, the only valid one is 3.
Regards. | |
| perfectionist 2004-04-28, 5:17 am |
| WOW!!! You guys are really professional man!!! Thanks for the info man!! | |
| repentantvoter 2004-04-28, 9:40 am |
| Thank you very much for your input, gentlemen! I am still somewhat confused. I understand networks 192.0.0.0 and 223.255.255.0 are reserved, but even if they are reserved, they still are class C networks, aren't they? | |
| ASnowy 2004-04-28, 10:59 am |
| Yes, they are. I think your confusion could be due to interpretation.
I think the answer to this question could include any network numbers between the first and the last in the range [192.0.0.0 to 223.255.255.0], so from this six possiblies, the only one correct is 3.
________
Think this is a valid between others included in the hole range.
Examples:
192.1.0.0 to 223.254.0.0 or
198.254.0.0 to 216.92.40.0 or....
________  | |
| repentantvoter 2004-04-28, 11:17 am |
| I see, I see. Now that you mention it I read the question again, and it says "a valid representation...", not "the valid representation...". I can understand now why I was confused. Thank you so much for your input, sir!! |
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