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Jan 26th, 2008

I am going to sit for CCNA 640-802 very soon. So I am trying to solve all CCNA Practice Questions from Cisco's Learning and Assessment Team(CCNA Prep Center).

So please help me to solve a question from this site.

27. Which two of these addresses are private IP addresses? (Choose two.)

i)10.215.34.124, ii)127.16.71.43, iii)172.17.10.10, iv)225.200.15.10

according to-

[http://forums.cisco.com/

Tranning->

CCNA Prep Center->

CCNA Practice Questions from Cisco's Learning and Assessment Team->

ICND1 and ICND2 Practice Questions->

ICND1, Module 1 New!->

Question no. 27 ]

ii) & iii) are correct answer.

But we know-

Class A-10.0.0.0 through 10.255.255.255

Class B-172.16.0.0 through 172.31.255.255

Class C-192.168.0.0 through 192.168.255.255

are private addresses.

Please send your suggestion.

I have this problem too.
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Hi There

You are indeed correct. This is obviously a misprint on the web page.

Although you could argue that 127.0.0.0/8 is indeed a private IP range, as it is reserved for host loopback addresses (RFC 3330).

http://www.faqs.org/rfcs/rfc3330.html

**** Taken from RFC 3330 ****

127.0.0.0/8 - This block is assigned for use as the Internet host loopback address. A datagram sent by a higher level protocol to an

address anywhere within this block should loop back inside the host. This is ordinarily

implemented using only 127.0.0.1/32 for loopback, but no addresses within this block

should ever appear on any network anywhere [RFC1700, page 5].

**** end of extract ***

When questions are asked about "private" IP addresses, it is normally understood to mean private IP addresses as per RFC 1918, which as you correctly listed in your post are

10.0.0.0/8

172.16.0.0/12

192.168.0.0/16

So if I were answering that question, I would pick answers 1 & 3.

Answer 2 is an address in the loopback range and answer 4 is an address in the multicast range.

Best Regards,

Michael.

Majdi Harb Sat, 01/26/2008 - 09:54

Hi subrata_mckv

correct answers are:

10.215.34.124

172.17.10.10

it may be a print error, if you were to encounter this question in your exam answer i and iii and i'll be resposible of this answer :)

good luck

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