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Re: Passed INTRO on to ICND

been called the subnet exam. About 90% of the questions were on subnetting

and mixed in with other subjects. In fact the config answers could have been

gleaned from the IP addressing. I found the simulation question impossible

at the time (although I now know what it is - I think!).

I had NO or very few questions on ISDN, WANs, Frame Relay, routing theory,

VLANs, the configurations all had IP addressing calculations mixed in. I

have studied for this exam for the past two months and I really knew my

stuff regarding theory and commands. Unfortunately the exam was MASSIVELY

skewed towards addressing (a problem I have now resolved in my revision).

Also the Richard Deal book is excellent but his practice exam questions are

far too soft to prepare you adequately - be warned.

Looking forward to the resit - and possibly getting a better balance of

questions.

K.

I have already passed the Cisco 640-821 CCNA INTRO, I was just

wondering for anyone else who took the path of Intro and ICND how hard

the ICND is compared to the intro?

Thanks

Re: Passed INTRO on to ICND

Yea i went to www.learntosubnet.com

I also bough the Wendell odem INTRO book from Cisco Press it came w/

simulation Software. The book was only 25 bucks, in my opinion was

well worth it. I recieved the book in 3 days. However I have since

ordered the ICND book by wendell odem and it has been a week and a

half and i have not recieved it.

Anyhow, good luck on your next try.

Re: Passed INTRO on to ICND

I was expecting a lot of subnet questions and was fairly well prepared.

One thing that I found that helped a lot was writing down a table with

the magic number for each mask/# of bits.

# bits mask magic number

1 128 128

2 192 64

3 224 32

4 240 16

5 248 8

6 252 4

7 254 2

8 255 1

I also wrote down multiples of 16 upto 256. ie.

16

32

48

64

96

..

176

192

208

224

240

256

The reason I wrote down the multiples of 16 was because I found that

most 'hard' subnet questions were a .240, /20 or /28 network.

So if you get asked if 192.168.1.239 is a valid host in a /28 network,

you can look up and see that 239 is 1 less than 240, so it's a broadcast

address.

Or if your asked if 192.168.1.173/28 and 192.168.1.178/28 are in the

same subnet, you can see straight away that they are not.

If asked about a .224 or .192 network, then you can just look at every

2nd or 4th number in the list.

Kendo Nagasaki wrote:

One thing that I found that helped a lot was writing down a table with

the magic number for each mask/# of bits.

# bits mask magic number

1 128 128

2 192 64

3 224 32

4 240 16

5 248 8

6 252 4

7 254 2

8 255 1

I also wrote down multiples of 16 upto 256. ie.

16

32

48

64

96

..

176

192

208

224

240

256

The reason I wrote down the multiples of 16 was because I found that

most 'hard' subnet questions were a .240, /20 or /28 network.

So if you get asked if 192.168.1.239 is a valid host in a /28 network,

you can look up and see that 239 is 1 less than 240, so it's a broadcast

address.

Or if your asked if 192.168.1.173/28 and 192.168.1.178/28 are in the

same subnet, you can see straight away that they are not.

If asked about a .224 or .192 network, then you can just look at every

2nd or 4th number in the list.

Kendo Nagasaki wrote:

Re: Passed INTRO on to ICND

In the magic number table what I found helps me is writing how many hosts

and subnets are in each mask underneath so my table looks like :-

MASK 128 192 224 240 248 252 254 255

VALUE 128 64 32 16 8 4 2 1

SUBNETS 0 2 6 14 30 62 126 254

HOSTS 126 62 30 14 6 2 0 0

To remember how many subnets and hosts I put a the 14 value (16 minus

network and b/c address) in the 240 mask and can work out the rest from

there and each side mirrors the other. e.g. 6 subnets in 224 and 6 hosts in

248. So things become realy easy when I'm asked in (practice) questions how

many hosts in a 252 mask etc. However I'm going to add the 16 multiples

table as you suggest, the thing I forgot to mention in my original post that

basically I ran out of time. These subnets really need to be solved within

77 seconds (not that I've worked it out ;-)) to leave 10 minutes for the

simulation question which I bombed on last time coz I ran out of time. These

tables can be written out before the exam clock starts ticking.

If BMoore is interested and still out there the Wendell Odell ICND book in

PDF can be found here for download http://thinkjoshua.com/download.php There

are no practice questions from the CD or anything else from the CD for that

matter, just the PDF (disclaimer - this isn't my site).

K.

I was expecting a lot of subnet questions and was fairly well prepared.

One thing that I found that helped a lot was writing down a table with

the magic number for each mask/# of bits.

# bits mask magic number

1 128 128

2 192 64

3 224 32

4 240 16

5 248 8

6 252 4

7 254 2

8 255 1

I also wrote down multiples of 16 upto 256. ie.

16

32

48

64

96

..

176

192

208

224

240

256

The reason I wrote down the multiples of 16 was because I found that

most 'hard' subnet questions were a .240, /20 or /28 network.

So if you get asked if 192.168.1.239 is a valid host in a /28 network,

you can look up and see that 239 is 1 less than 240, so it's a broadcast

address.

Or if your asked if 192.168.1.173/28 and 192.168.1.178/28 are in the

same subnet, you can see straight away that they are not.

If asked about a .224 or .192 network, then you can just look at every

2nd or 4th number in the list.

Kendo Nagasaki wrote:

Re: Passed INTRO on to ICND

The ICND is of course by Wendell Odom.

Thanks Brad excellent stuff.

In the magic number table what I found helps me is writing how many hosts

and subnets are in each mask underneath so my table looks like :-

MASK 128 192 224 240 248 252 254 255

VALUE 128 64 32 16 8 4 2 1

SUBNETS 0 2 6 14 30 62 126 254

HOSTS 126 62 30 14 6 2 0 0

To remember how many subnets and hosts I put a the 14 value (16 minus

network and b/c address) in the 240 mask and can work out the rest from

there and each side mirrors the other. e.g. 6 subnets in 224 and 6 hosts in

248. So things become realy easy when I'm asked in (practice) questions how

many hosts in a 252 mask etc. However I'm going to add the 16 multiples

table as you suggest, the thing I forgot to mention in my original post that

basically I ran out of time. These subnets really need to be solved within

77 seconds (not that I've worked it out ;-)) to leave 10 minutes for the

simulation question which I bombed on last time coz I ran out of time. These

tables can be written out before the exam clock starts ticking.

If BMoore is interested and still out there the Wendell Odell ICND book in

PDF can be found here for download http://thinkjoshua.com/download.php There

are no practice questions from the CD or anything else from the CD for that

matter, just the PDF (disclaimer - this isn't my site).

K.

I was expecting a lot of subnet questions and was fairly well prepared.

One thing that I found that helped a lot was writing down a table with

the magic number for each mask/# of bits.

# bits mask magic number

1 128 128

2 192 64

3 224 32

4 240 16

5 248 8

6 252 4

7 254 2

8 255 1

I also wrote down multiples of 16 upto 256. ie.

16

32

48

64

96

..

176

192

208

224

240

256

The reason I wrote down the multiples of 16 was because I found that

most 'hard' subnet questions were a .240, /20 or /28 network.

So if you get asked if 192.168.1.239 is a valid host in a /28 network,

you can look up and see that 239 is 1 less than 240, so it's a broadcast

address.

Or if your asked if 192.168.1.173/28 and 192.168.1.178/28 are in the

same subnet, you can see straight away that they are not.

If asked about a .224 or .192 network, then you can just look at every

2nd or 4th number in the list.

Kendo Nagasaki wrote:

Thanks Brad excellent stuff.

In the magic number table what I found helps me is writing how many hosts

and subnets are in each mask underneath so my table looks like :-

MASK 128 192 224 240 248 252 254 255

VALUE 128 64 32 16 8 4 2 1

SUBNETS 0 2 6 14 30 62 126 254

HOSTS 126 62 30 14 6 2 0 0

To remember how many subnets and hosts I put a the 14 value (16 minus

network and b/c address) in the 240 mask and can work out the rest from

there and each side mirrors the other. e.g. 6 subnets in 224 and 6 hosts in

248. So things become realy easy when I'm asked in (practice) questions how

many hosts in a 252 mask etc. However I'm going to add the 16 multiples

table as you suggest, the thing I forgot to mention in my original post that

basically I ran out of time. These subnets really need to be solved within

77 seconds (not that I've worked it out ;-)) to leave 10 minutes for the

simulation question which I bombed on last time coz I ran out of time. These

tables can be written out before the exam clock starts ticking.

If BMoore is interested and still out there the Wendell Odell ICND book in

PDF can be found here for download http://thinkjoshua.com/download.php There

are no practice questions from the CD or anything else from the CD for that

matter, just the PDF (disclaimer - this isn't my site).

K.

I was expecting a lot of subnet questions and was fairly well prepared.

One thing that I found that helped a lot was writing down a table with

the magic number for each mask/# of bits.

# bits mask magic number

1 128 128

2 192 64

3 224 32

4 240 16

5 248 8

6 252 4

7 254 2

8 255 1

I also wrote down multiples of 16 upto 256. ie.

16

32

48

64

96

..

176

192

208

224

240

256

The reason I wrote down the multiples of 16 was because I found that

most 'hard' subnet questions were a .240, /20 or /28 network.

So if you get asked if 192.168.1.239 is a valid host in a /28 network,

you can look up and see that 239 is 1 less than 240, so it's a broadcast

address.

Or if your asked if 192.168.1.173/28 and 192.168.1.178/28 are in the

same subnet, you can see straight away that they are not.

If asked about a .224 or .192 network, then you can just look at every

2nd or 4th number in the list.

Kendo Nagasaki wrote:

Re: Passed INTRO on to ICND

http://www.weird.com/~woods/classb.html

http://www.weird.com/~woods/classc.html

I memorized both of those charts for my INTRO Exam and wrote them down

before the exam started....

If you can memorize those 2 charts and know binary and how to do the

binary AND operation you should not have ANY trouble passing the CCNA

INTRO exam.

Re: Passed INTRO on to ICND

That's a lot to remember!

I had seen these tables before and I can understand the logic behind

them. But the magic number table can be applied to any of the octets,

instead of remembering a huge table for all of class B and class C. It's

also much easier to remember and write down.

How can you work out the subnet address of 192.168.2.67/28 quickly using

the class c table?

BMoore wrote:

I had seen these tables before and I can understand the logic behind

them. But the magic number table can be applied to any of the octets,

instead of remembering a huge table for all of class B and class C. It's

also much easier to remember and write down.

How can you work out the subnet address of 192.168.2.67/28 quickly using

the class c table?

BMoore wrote:

Re: Passed INTRO on to ICND

You do the boolean AND operation

you already know its going to be 192.168.2.*

so you take the binary of /28 which is 11110000 for the last octet

then you take the binary of 67 which is 01000011

you do the AND opertaion if their is a 1 and a 1 then it is a 1 if

their is a 0 and a 1 then it is a 0 or if its 0 and 0 its 0

so 11110000

+ 01000011

------------------

= 01000000

subnet address = 192.168.2.64

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