Couple of questions I got wrong

[Kryolla]

I just took the ICND test and failed 766. There was a couple of questions that confused me.

1) What is the unicast address from the following examples. I choose ffff.ffff.ffff. I got wrong Does anybody know the correct answer

2) Given the CIDR address what of the following belongs in the same block. Do I do normal subnetting for this? I also got this wrong

3) STP prevent routing loops or switching loops. I choose switching loops. Routing loops would be poisin reverse, split horizon, etc.

Thanks

 

[lgarner]

I haven' taken it, but I'll throw out my understandings:

1. All 1's is a broadcast, so that's not likely to be right.
2. There are always little details that I don't necessarily know, but I believe the only significance of CIDR is the "classless" part. But it is really normal subnetting.

i.e. 192.168.12.0/23 would include the "class c" networks of 192.168.12.0 and 172.168.13.0 for a total of 512 addresses (510 useable).

3. Spanning tree prevents switch loops, I don't see why that would be wrong.

 

[ReadRight]

I agree with lgarner. CIDR is like supernetting. It works the same as subnetting, but instead of breaking up one network into a bunch of subnets, you take a bunch of "subnets" and turn them into one network - just for routing purposes. So, if you have networks in your routing table:

192.168.0.0 /24
192.168.1.0 /24
192.168.2.0 /24
192.168.3.0 /24

instead of advertising all four networks separately to other routers, you can just advertise one route:

192.168.0.0 /22

 

[Kryolla]

I re took the ICND exam and passed today.

 

[volk125]

this might be off topic but I took CCNA before and missed by 2%, 83% was my score, and I did lots of hands on in college about a year and a half before taking the exam, and read the cisco press book and testking q&a before taking the exam. I also worked 1 year before the exam with cisco equipment and pix firewalls. In real world 75% of the stuff you learn for the exam is not needed at all. And that sucks! And all the employers care about is the stupid certificate saying that you did it. No matter how smart or how much real world experience you have. I'm going to do it again this year, but now my company will pay for everything, and that's the only reason I wanna do it again. Plus those little cert papers will increase your salary ) For those of you who have no opportunity to get some hands on, Simulators work just fine, and reading the TestKing Q&A will help a lot, because the CCNA test contains like 75% of same questions as TestKing.

 

[Wazz]

Just to follow up to volk125's post and reference to the router sims. I am taking my ccna next week, having deferred it countless times due to easter ect. I have just done a router sim on configuing ospf. Is it possible this comes up? I have never even seen all that
ip ospf message-digest 1 ospf # asecret
before. Should I defer it again and learn this stuff inside out?

 

[volk125]

Wazz, get the latest TestKing and go through it. But not just reading... understand the questions and answers and that will be enough, given that you already read the study guide and did hands on with the simulators. I recommend the TestKing because there is too much information and I think if you answer some questions on the exam that you already know from Testking quickly it leaves you more time to think about the harder questions. If given enough time on the exam I think I would do at least 95% however I tend to screw up when under pressure