Yeah, and good luck sneaking this thing into any Cisco cert test or the Lab.
:-)
(Now I've got this mental image of someone swallowing a condom with a
rolled-up slip of paper in it... ;-)
-----Original Message-----
From: MADMAN [mailto:[EMAIL PROTECTED]]
Sent: Friday, September 14, 2001 2:11 PM
To: [EMAIL PROTECTED]
Subject: Re: route summarisation question [7:19970]
Your correct, here is the table and the URL to a neat little subnet
calcuator
http://www.cisco.com/techtools/ip_addr.html
----------------------------------------------------------------------------
-
IP Class: B IP Address: 172.21.134.0
Mask Bits: 5 Subnet Mask: 255.255.248.0
Subnets: 30+1 IP Major Net: 172.21.0.0
Hosts/Subnet: 2046 Major Net Bcast: 172.21.255.255
Subnets for Fixed Length Subnet
Masking
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . .
No. Subnet Hosts Hosts Broadcast
Address From To Address
0 172.21.0.0 172.21.0.1 172.21.7.254
172.21.7.255
1 172.21.8.0 172.21.8.1 172.21.15.254
172.21.15.255
2 172.21.16.0 172.21.16.1 172.21.23.254
172.21.23.255
3 172.21.24.0 172.21.24.1 172.21.31.254
172.21.31.255
4 172.21.32.0 172.21.32.1 172.21.39.254
172.21.39.255
5 172.21.40.0 172.21.40.1 172.21.47.254
172.21.47.255
6 172.21.48.0 172.21.48.1 172.21.55.254
172.21.55.255
7 172.21.56.0 172.21.56.1 172.21.63.254
172.21.63.255
8 172.21.64.0 172.21.64.1 172.21.71.254
172.21.71.255
9 172.21.72.0 172.21.72.1 172.21.79.254
172.21.79.255
10 172.21.80.0 172.21.80.1 172.21.87.254
172.21.87.255
11 172.21.88.0 172.21.88.1 172.21.95.254
172.21.95.255
12 172.21.96.0 172.21.96.1 172.21.103.254
172.21.103.255
13 172.21.104.0 172.21.104.1 172.21.111.254
172.21.111.255
14 172.21.112.0 172.21.112.1 172.21.119.254
172.21.119.255
15 172.21.120.0 172.21.120.1 172.21.127.254
172.21.127.255
16 172.21.128.0 172.21.128.1 172.21.135.254
172.21.135.255
17 172.21.136.0 172.21.136.1 172.21.143.254
172.21.143.255
18 172.21.144.0 172.21.144.1 172.21.151.254
172.21.151.255
19 172.21.152.0 172.21.152.1 172.21.159.254
172.21.159.255
20 172.21.160.0 172.21.160.1 172.21.167.254
172.21.167.255
21 172.21.168.0 172.21.168.1 172.21.175.254
172.21.175.255
22 172.21.176.0 172.21.176.1 172.21.183.254
172.21.183.255
23 172.21.184.0 172.21.184.1 172.21.191.254
172.21.191.255
24 172.21.192.0 172.21.192.1 172.21.199.254
172.21.199.255
25 172.21.200.0 172.21.200.1 172.21.207.254
172.21.207.255
26 172.21.208.0 172.21.208.1 172.21.215.254
172.21.215.255
27 172.21.216.0 172.21.216.1 172.21.223.254
172.21.223.255
28 172.21.224.0 172.21.224.1 172.21.231.254
172.21.231.255
29 172.21.232.0 172.21.232.1 172.21.239.254
172.21.239.255
30 172.21.240.0 172.21.240.1 172.21.247.254
172.21.247.255
31 172.21.248.0 172.21.248.1 172.21.255.254
172.21.255.255
The New Guy wrote:
>
> A buddy and I are currently preparing for the BSCN exam.
> One of the review questions involving route summarization is as follows:
>
> 172.21.136.0/24 and 172.21.143.0/24 can be summarized as: ??
>
> We both came to the same conclusion:
>
> ^
> 172.21.136.0 -> 10101100.00010101.10001000.00000000
> 172.21.143.0 -> 10101100.00010101.10001111.00000000
> ^
>
> Both addresses have the first 20 bits in common so the summarized address
> would
> be:
> 172.21.136.0/21
>
> However, Cisco says the answer is 172.21.134.0/21
> Can someone please confirm we summarized this route right. I think the
test
> from Cisco is wrong, typo or something
>
> Dyland
--
David Madland
Sr. Network Engineer
CCIE# 2016
Qwest Communications Int. Inc.
[EMAIL PROTECTED]
612-664-3367
"Emotion should reflect reason not guide it"
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=19990&t=19970
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