I am not sure if Brian is talking about this
http://www.3com.com/nsc/501302.html but it is worth the reading.
It is by Chuck Semeria . (about 100 pages in pdf format accessible at bottom
of html page)
Daniel
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
Brian Lodwick
Sent: Saturday, October 14, 2000 9:31 AM
To: [EMAIL PROTECTED]
Subject: Re: Subnet mask question..
Brian,
I hate the way these tests word their questions sometimes. Why don't they
just state the mask as it should be -contiguous bits left to right(except
for wildcard masks ofcourse). If they are going to state the subnet portion
is stealing 11 bits from the host portion of the address why don't they just
state that.
You are exactly right though a /11 subnet mask is 255.224.0.0
Don't let these silly tests screw you up. I think sometimes they try to
impress a point and screw things up. I don't think Cisco is in the business
to have you memorize wrong information. (If you know subnetting in the real
world, you will pass their test questions regarding these issues ~~I would
read Cisco's ACRC book and practice their examples, there is also a great
section on 3com's website on subnetting I highly reccomend).
There are 3 portions of the address (network,subnet,and host)and the subnet
portion is using 11 host bits to subdivide this class b network.
The subnet mask would be /27 or 255.255.255.224 not /11.
>>>Brian
>
>At 08:47 AM 10/14/2000 +0000, you wrote:
>>Default netmask for class B is 255.255.0.0 with 11 subnet mask you will
>>have /27
>>ie 255.255.255.224
>>
>>it's bit confusing though..
>>
>>Nobody
>>Keith Woodworth <[EMAIL PROTECTED]> wrote in article
>><[EMAIL PROTECTED]>...
>> >
>> > Ive been at this for quite a while and the odd subnet question still
>>gets
>> > me.
>> >
>> > Boson question:
>> >
>> > IP address 172.16.3.57 w/ and 11-bit subnet mask. What are valid hosts?
>> >
>> > I think ok class B, but I look at 11 bits as 255.224.0.0
>> > (11111111.11100000.0.0) which does not go with the choices of answers I
>> > had.
>> >
>> > I got it wrong as the answer says an 11-bit mask is 255.255.255.224
>>when
>> > using a class b address. Is the mask there not 27 bits? What am I
>>missing
>> > there? How do they get the above mask w/11 bits?
>> >
>> > The valid hosts were:
>> >
>> > 172.16.3.33-172.16.3.62, which I think is valid for a 27 bit mask
>> >
>>
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