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Home > Archive > alt.certification.cisco > August 2003 > damn, i failed. questions.
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| Author |
damn, i failed. questions.
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| radioactiveman 2003-08-22, 7:26 pm |
| got a 758. most of the stuff i studied for wasn't even on it. damn.
here's my diagnostic report.
bridging and switching 66%
osi 83%
routed protocols 58%
routing protocols 66%
wan services 83%
network management 66%
lan technologies 66%
cisco and network basics 25%
anyone know what type of questions are cisco and network basics? i scored
only 25% on that one.
anyone know how to get the subnet mask required for a minimum host of
500, class c. there was a question like that but i could remember it
exactly. i know 2^9-2=510. how do i write it in subnet mask?
not to XXXXX or anything but the computer i was on was real slow. during
the sims, every key i press shows up on the screen 3 seconds later. when
i made a typo and try to backspace, it took forever. it got me so
frustrated. i probably wasted a good 10 to 15 mins extra on the sims cause
its so slow.
| |
| Netwerkz 2003-08-22, 11:26 pm |
|
"radioactiveman" <radioactivem@springfield.com> wrote in message
news an.2003.08.22.22.36.50.875879@springfield.com...
> got a 758. most of the stuff i studied for wasn't even on it. damn.
> here's my diagnostic report.
>
> bridging and switching 66%
> osi 83%
> routed protocols 58%
> routing protocols 66%
> wan services 83%
> network management 66%
> lan technologies 66%
> cisco and network basics 25%
>
> anyone know what type of questions are cisco and network basics? i scored
> only 25% on that one.
>
> anyone know how to get the subnet mask required for a minimum host of
> 500, class c. there was a question like that but i could remember it
> exactly. i know 2^9-2=510. how do i write it in subnet mask?
>
> not to XXXXX or anything but the computer i was on was real slow. during
> the sims, every key i press shows up on the screen 3 seconds later. when
> i made a typo and try to backspace, it took forever. it got me so
> frustrated. i probably wasted a good 10 to 15 mins extra on the sims cause
> its so slow.
>
The basics includeusing show commands, loading/saving ios images or configs,
connecting to the router (type of cable or connection), configuring
passwords,
etc.
2^9-2=510
NNNNNNNN.NNNNNNNN.NNNNNNNH.HHHHHHHH
N=network bit
H=host bit
in the third octect - going from left to right we add the values of
the bits to get the net mask octect value.
128+64+32+16+8+4+2 = 254
so class C subnet would be:
255.255.254.0
good luck on your retest
| |
|
| maybe I'm missing something (it wouldn't be the first time!) but the default
mask for a class C in standard subnetting is 255.255.255.0. So the most
hosts you can have is 254.
"Netwerkz" <Netwerkz101@comcast.net> wrote ie n message
news:cGA1b.176210$Oz4.45864@rwcrnsc54...
>
> "radioactiveman" <radioactivem@springfield.com> wrote in message
> newsan.2003.08.22.22.36.50.875879@springfield.com...
> > got a 758. most of the stuff i studied for wasn't even on it. damn.
> > here's my diagnostic report.
> >
> > bridging and switching 66%
> > osi 83%
> > routed protocols 58%
> > routing protocols 66%
> > wan services 83%
> > network management 66%
> > lan technologies 66%
> > cisco and network basics 25%
> >
> > anyone know what type of questions are cisco and network basics? i
scored
> > only 25% on that one.
> >
> > anyone know how to get the subnet mask required for a minimum host of
> > 500, class c. there was a question like that but i could remember it
> > exactly. i know 2^9-2=510. how do i write it in subnet mask?
> >
> > not to XXXXX or anything but the computer i was on was real slow.
during
> > the sims, every key i press shows up on the screen 3 seconds later.
when
> > i made a typo and try to backspace, it took forever. it got me so
> > frustrated. i probably wasted a good 10 to 15 mins extra on the sims
cause
> > its so slow.
> >
> The basics includeusing show commands, loading/saving ios images or
configs,
> connecting to the router (type of cable or connection), configuring
> passwords,
> etc.
>
> 2^9-2=510
>
> NNNNNNNN.NNNNNNNN.NNNNNNNH.HHHHHHHH
>
> N=network bit
> H=host bit
>
> in the third octect - going from left to right we add the values of
> the bits to get the net mask octect value.
>
> 128+64+32+16+8+4+2 = 254
>
> so class C subnet would be:
>
> 255.255.254.0
>
>
> good luck on your retest
>
>
---
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Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.512 / Virus Database: 309 - Release Date: 8/19/2003
| |
|
| As far as I understand subnetting, class C networks can have a maximum of
253 usable IP addresses (255-2). So, the question may have been a trick one.
You will need two class C networks to cover 500 IP addresses. For example,
192.168.0.0/24 & 192.168.1.0/24. You can move to a class B network
172.16.0.0 and use one subnet, consisting of (512 - 2) hosts (for example
172.16.0.0 255.255.254.0, which includes the following IP address space
(172.16.0.0 -- 172.16.0.255 -- 172.16.1.0 -- 172.16.1.255). You can also use
the 192.168.0.0 example and supernet the two Class C networks into
192.168.0.0 255.255.254.0, which will include two Class C networks
(192.168.0.0 & 192.168.1.0). This is used for route summarization to keep
routing tables of backbone routers smaller when multiple contiguous Class C
IP addresses are assigned to one organization. However, in this case we are
talking about classless networking, so the supernetting of Class C networks
makes it a classless network (Class C networks by definition have a mask of
/24; our 192.168.0.0 network has a mask of /23. The network still looks like
it is a Class C network "192.168.0.0"; however, the mask of /23 made it a
classless network). So, to answer your question, you can't create a Class C
network that will accommodate 500 hosts, but you can create a Class B
subnet, accommodating 500 hosts or a classless network accommodating 500
hosts.
Grey
"adioactiveman" <radioactivem@springfield.com> wrote in message
newsan.2003.08.22.22.36.50.875879@springfield.com...
> got a 758. most of the stuff i studied for wasn't even on it. damn.
> here's my diagnostic report.
>
> bridging and switching 66%
> osi 83%
> routed protocols 58%
> routing protocols 66%
> wan services 83%
> network management 66%
> lan technologies 66%
> cisco and network basics 25%
>
> anyone know what type of questions are cisco and network basics? i scored
> only 25% on that one.
>
> anyone know how to get the subnet mask required for a minimum host of
> 500, class c. there was a question like that but i could remember it
> exactly. i know 2^9-2=510. how do i write it in subnet mask?
>
> not to XXXXX or anything but the computer i was on was real slow. during
> the sims, every key i press shows up on the screen 3 seconds later. when
> i made a typo and try to backspace, it took forever. it got me so
> frustrated. i probably wasted a good 10 to 15 mins extra on the sims cause
> its so slow.
>
| |
|
|
"Grey" <bbb@ccc.com> wrote in message
news:hOadnQDim-gbcNuiXTWJhQ@comcast.com...
> As far as I understand subnetting, class C networks can have a maximum of
> 253 usable IP addresses (255-2).
254 usable addresses (256-2).
| |
| André Franke 2003-08-23, 8:24 am |
| "radioactiveman" <radioactivem@springfield.com> wrote:
>anyone know how to get the subnet mask required for a minimum host of
>500, class c. there was a question like that but i could remember it
>exactly. i know 2^9-2=510. how do i write it in subnet mask?
>
>not to XXXXX or anything but the computer i was on was real slow. during
>the sims, every key i press shows up on the screen 3 seconds later. when
>i made a typo and try to backspace, it took forever. it got me so
>frustrated. i probably wasted a good 10 to 15 mins extra on the sims cause
>its so slow.
That particular question was about 468 or so hosts in a class B
network. (passed yesterday and had the same question).
Now it makes sense, because the last octet describes 256(-2) hosts
wich wouldn't be enough and if you double it by going just one bit to
the left you get 512 wich is more that enough. Also it was required to
save as much bits for subnets as possible, what is also achieved by
using a subnet size that provides no less than the required number of
hosts.
They also could have asked about a host number of 255 to 510 and it
would always be the mask of 255.255.254.0 or /23.
As for the flash sims take some advice.
Use the following scheme for troubleshooting:
(optionally) ping the serial and ethernetport of a neighboring router
or do a 'sh ip route' first to see if you are on the misconfigured
router
1.
Router#sh run
2.
routing protocol enabled? (router rip/router igrp xxx)(same on all
routers?)
3.
number of interfaces = number of router network entries?
4.
Do the network entries match the interface adresses?
5.
Router#sh ip int brief
6.
all (connected)interfaces working? (Up/Up)
7.
IP/subnetmask ok?
If you find a misconfig or missing entry, correct that and check with
the following:
1.
Router#sh ip route
2.
C or S routes for each interface?
R or I routes for all other routers interfaces (except the directly
connected one)?
3.
ping to ethernetports (or - if available - connected hosts) of the
other routers ok?
That way you should be able to identify the problem(s) as fast as
possible. Also type slowly and carefully to avoid typos, don't try to
reuse previously typed stuff by editing it. Edit keys are not the same
as in text processing software and you will make mistakes consuming
extra time.
As I noticed you will be given the chance to answer extra questions if
you are through and there is time left while you didn't reach the
passing score. So if you make some mistakes but save your time you
will have the chance to gain you badly needed points later. It's all
just a matter of efficient work.
regards
André
| |
|
| > So, to answer your question, you can't create a Class C
> network that will accommodate 500 hosts, but you can create a Class B
> subnet, accommodating 500 hosts or a classless network accommodating 500
> hosts.
> > anyone know how to get the subnet mask required for a minimum host of
> > 500, class c.
radioactiveman, is there any option like "no answer "
| |
|
| Right, my mistake. I was posting it late at night. 
Grey
"Chris" <chris@nospam.com> wrote in message
news:bi7ir9$v4q$1@newsreaderm1
.core.theplanet.net...
>
> "Grey" <bbb@ccc.com> wrote in message
> news:hOadnQDim-gbcNuiXTWJhQ@comcast.com...
> > As far as I understand subnetting, class C networks can have a maximum
of
> > 253 usable IP addresses (255-2).
>
> 254 usable addresses (256-2).
>
>
| |
| radioactiveman 2003-08-23, 2:25 pm |
| On Sat, 23 Aug 2003 02:52:56 +0000, Netwerkz wrote:
>>
>> bridging and switching 66%
>> osi 83%
>> routed protocols 58%
>> routing protocols 66%
>> wan services 83%
>> network management 66%
>> lan technologies 66%
>> cisco and network basics 25%
>>
which section deals with the sims. i think i butchered those too.
| |
| André Franke 2003-08-23, 3:24 pm |
| "radioactiveman" <radioactivem@springfield.com> wrote:
>On Sat, 23 Aug 2003 02:52:56 +0000, Netwerkz wrote:
>
>>>
>>> bridging and switching 66%
>>> osi 83%
>>> routed protocols 58%
>>> routing protocols 66%
>>> wan services 83%
>>> network management 66%
>>> lan technologies 66%
>>> cisco and network basics 25%
>>>
>
>which section deals with the sims. i think i butchered those too.
Depends on what was reuired by the sims. No extra section for that.
regards
André
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