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Home > Archive > CCNA > February 2004 > reserved networks
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| worrywarm 2004-02-24, 12:57 am |
| which 4 of the following are considerd 'reserved' networks?
a. 9.0.0.0
b. 128.0.0.0
c. 191.255.0.0
d. 192.0.0.0
e. 223.255.255.255
f. 223.255.255.0
The answer is b,c,d,f.
What does it mean? I don't understand the whole thing at all. What is reserved networks???
anyone can give a hand?
TIA! | |
| Kitsune 2004-02-24, 7:06 am |
| Reserved networks are those addresses that have a specific application or use and therefore cannot be used as ip addresses. Like 127.0.0.0 is reserved for loopback. Also, those addresses that are reserved for broadcasts and, in this case, zero nets.
128.0.0.0 is the zero net of class b. 192.255.0.0 is the network broadcast of B. 192.0.0.0 is the zero of C. Finally, 223.255.255.0 is, you guessed it, the network broadcast of C.
I am 99% sure on this. And, if I am mistaken, I am sure someone will correct me.
Also, I believe I have heard the term "reserved" used for private network addresses. But that may just have been sloppy wording. | |
| dmaftei 2004-02-24, 11:08 am |
| quote:
Originally posted by worrywarm
What does it mean? I don't understand the whole thing at all. What is reserved networks???
You should start by understanding that the IPv4 address space is managed by IANA (www.iana.org). IANA set aside a few ranges of numbers in this address space; these ranges are the "reserved networks". For the full list of reserved networks get rfc 3330. I doubt many people know all the reserved networks (I don't); I guess you're OK if you remember the interesting ones:
0.0.0.0/8: "this" network
10.0.0.0/8: private
127.0.0.0/8: lopback
172.16.0.0/12: private
192.168.0.0/16: private
224.0.0.0/4: multicast
240.0.0.0/4: experimental | |
| worrywarm 2004-02-24, 11:10 am |
| as I know, reserved IP includes network address of all 0s, network address of all 1s, 127.0.0.1, node address of all 0s, node address of all 1s, entire ip address set to all 0s, entire ip address set to all 1s.
I never heard about this. Can you explain a little bit more?
THank you very much! | |
| dmaftei 2004-02-24, 11:15 am |
| quote:
Originally posted by Kitsune
And, if I am mistaken, I am sure someone will correct me.
You can bet on that. Not to put you down, but it seems you have your addressing kind of messed up. There is no such thing as the network broadcast of B or the zero net of class b. I suspect you're thinking of the "subnet address" and the "broadcast address" of a given subnet. | |
| worrywarm 2004-02-24, 11:19 am |
| quote:
Originally posted by worrywarm
as I know, reserved IP includes network address of all 0s, network address of all 1s, 127.0.0.1, node address of all 0s, node address of all 1s, entire ip address set to all 0s, entire ip address set to all 1s.
I never heard about this. Can you explain a little bit more?
THank you very much!
wrote the msg at the same time when dmaftei writing  Yeah, I only know a few common reserved IP addresses.
The doubt is wnat Kitsune said are not in the list,what are they? what's the point of this question?
THanks!! | |
| dmaftei 2004-02-25, 9:44 am |
| quote:
Originally posted by worrywarm
The doubt is wnat Kitsune said are not in the list,what are they?
Exactly what is not in what list?!
quote:
what's the point of this question?
I've been wondering myself...  |
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