Here is an example of the kind of treacherous nuance in which the 153 practice questions that come with Odom's ICND1 book (and are served through the Boson exam engine) seem to delight.
I am a CCENT candidate, have not yet taken my test, and have developed pretty solid confidence with the Boson ExSim Max exams. But whenever I feel that I need a dose of humility and reaffirm my fear that I will not have enough time to answer all of the questions in the real exam, I revisit the Cisco Press questions.
Many of these questions blend multiple distinct topics really make it impossible to succeed by guessing or luck. That's good! These questions have definitely reinforced my reading and made me feel like I really could begin to troubleshoot a network problem. Bravo!
At the same time, and maybe your experience is the same, I take way longer to answer the Cisco Press questions, which in my opinion are several levels more difficult than the Boson ExSim Max questions.
And so two questions, the second being your opinion on the question below, the first being anyone's experience with how the Cisco Press question compare in difficult to the real exam questions.
Among the question's possible answers, all are reserved IP addresses, but two are not valid private IP addresses, according to RFC 1918. I think that's what we're supposed to take home there.
The question's explanation could be improved, in my opinion, concerning the distinction between private and reserved.
Is is not true that any 169.254 address is reserved, according to RFC 3927?
Is it not also true that any 127 address is reserved, according to RFC 3330?
But neither is a valid private address, seems to be the point of the question, I guess.
Link-local addresses (RFC 3927):
Loopback addresses (RFC 3330):
Comments? Here is the question, verbatim:
Cisco Press CCNA ICND 1 :: CD-I1-3-06-001-1
Which of the following are reserved private IP addresses, according to RFC 1918.
Correct Answers: C, D, E.
"The RFC 1918 private network numbers are 10.0.0.0, Class Bs between 172.16.0.0 and 172.31.0.0 inclusive, and all Class C networks that begin with 192.168. All addresses that begin with 127 are reserved, but not as valid private IP addresses."