Route Summarisation question
Assuming the following internal routes need to be summarised 10.40.3.11 255.255.255.240 10.40.3.15 255.255.255.240 10.40.3.18 255.255.255.240 10.40.3.26 255.255.255.240 Could they be summarised as 10.40.3.0 255.255.255.224 and the space summarised would be 10.40.3.1 - 10.40.3.53 Am I completely off base or close to the correct answer? I have studied so much I have confused myself. thanks stuart _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Route Summarisation question
/27 is the correct summarization for those routes, but the range it covers is 0-31, with 1-30 being valid hosts. Get a subnet calculator to double-check your math: http://support.3com.com/software/utilities_for_windows_32_bit.htm ftp://ftp.3com.com/pub/utilbin/win32/3CIPCalc.zip -- Jason Roysdon, CCNP+Security/CCDP, MCSE, CNA, Network+, A+ List email: [EMAIL PROTECTED] Homepage: http://jason.artoo.net/ Cisco resources: http://r2cisco.artoo.net/ "Stuart Laubstein" <[EMAIL PROTECTED]> wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > Assuming the following internal routes need to be summarised > 10.40.3.11 255.255.255.240 > 10.40.3.15 255.255.255.240 > 10.40.3.18 255.255.255.240 > 10.40.3.26 255.255.255.240 > > > Could they be summarised as > > 10.40.3.0 255.255.255.224 and the space summarised would be 10.40.3.1 > - 10.40.3.53 > > Am I completely off base or close to the correct answer? I have studied so > much I have confused myself. > > thanks > > stuart > > > > > _ > FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] > _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Route Summarisation question
You can summarise them using the following network and mask 10.40.3.0 with a mask of 255.255.255.224 or 10.40.3.0 / 27 Remember this will also include all networks inbetween 10.40.3.0 - 10.40.3.31 "Stuart Laubstein" <[EMAIL PROTECTED]> wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > Assuming the following internal routes need to be summarised > 10.40.3.11 255.255.255.240 > 10.40.3.15 255.255.255.240 > 10.40.3.18 255.255.255.240 > 10.40.3.26 255.255.255.240 > > > Could they be summarised as > > 10.40.3.0 255.255.255.224 and the space summarised would be 10.40.3.1 > - 10.40.3.53 > > Am I completely off base or close to the correct answer? I have studied so > much I have confused myself. > > thanks > > stuart > > > > > _ > FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] > _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Route Summarisation question
If you understand subnet masking well, route summarization is no different. It is, by all practical purposes, the same thing. The best way to check your self is to break it all down to Binary. The bits with the common factor will lead you to the point of reference for your summarized route. --- Santosh Koshy <[EMAIL PROTECTED]> wrote: > You can summarise them using the following network > and mask > > 10.40.3.0 with a mask of 255.255.255.224 > or > 10.40.3.0 / 27 > > Remember this will also include all networks > inbetween 10.40.3.0 - > 10.40.3.31 > > > "Stuart Laubstein" <[EMAIL PROTECTED]> wrote > in message > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > Assuming the following internal routes need to be > summarised > > 10.40.3.11 255.255.255.240 > > 10.40.3.15 255.255.255.240 > > 10.40.3.18 255.255.255.240 > > 10.40.3.26 255.255.255.240 > > > > > > Could they be summarised as > > > > 10.40.3.0 255.255.255.224 and the space > summarised would be > 10.40.3.1 > > - 10.40.3.53 > > > > Am I completely off base or close to the correct > answer? I have studied so > > much I have confused myself. > > > > thanks > > > > stuart > > > > > > > > > > _ > > FAQ, list archives, and subscription info: > http://www.groupstudy.com/list/cisco.html > > Report misconduct and Nondisclosure violations to > [EMAIL PROTECTED] > > > > > _ > FAQ, list archives, and subscription info: > http://www.groupstudy.com/list/cisco.html > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] = Chris from Chicago MasterCNE, 5.x CNE, ICNE, 4.x CNE, CCNA, MCP __ Do You Yahoo!? Get personalized email addresses from Yahoo! Mail - only $35 a year! http://personal.mail.yahoo.com/ _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
route summarisation question [7:19970]
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. 172.21.143.0 -> 10101100.00010101.1000. ^ 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 Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=19970&t=19970 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: route summarisation question [7:19970]
The block is 136-144 in the /21 range so you'd be right, though you'd also be summarizing other addresses which you do not explicitly have connectivity to. *** REPLY SEPARATOR *** On 9/14/2001 at 12:19 PM 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. >172.21.143.0 -> 10101100.00010101.1000. > ^ > >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 Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=19975&t=19970 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: route summarisation question [7:19970]
Dyland, you're right, it is a typo or something. As a sanity check (probably a BAD habit) I use the subnet program offered by boson... according to that program: 172.21.134.0/21 = 172.21.128.1 to 172.21.235.254 while 172.21.136.0/21 = 172.21.128.1 to 172.21.136.1 to 172.21.143.254 so, I would say that you are right... hth, Dave Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=19976&t=19970 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: route summarisation question [7:19970]
Derek... speaking of typo's my email was SUPPOSED to say: 172.21.134.0/21 = 172.21.128.1 to 172.21.135.254 while 172.21.136.0/21 = 172.21.136.1 to 172.21.143.254 Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=19977&t=19970 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
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+1IP Major Net:172.21.0.0 Hosts/Subnet: 2046Major Net Bcast: 172.21.255.255 Subnets for Fixed Length Subnet Masking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . No. Subnet HostsHostsBroadcast 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. > 172.21.143.0 -> 10101100.00010101.1000. > ^ > > 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=19983&t=19970 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: route summarisation question [7:19970]
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+1IP Major Net:172.21.0.0 Hosts/Subnet: 2046Major Net Bcast: 172.21.255.255 Subnets for Fixed Length Subnet Masking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . No. Subnet HostsHostsBroadcast 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. > 172.21.143.0 -> 10101100.00010101.1000. > ^ > > 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 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
