Re: Subnet questions
On Sun, 4 Feb 2001, Hunt Lee wrote: > I have three subnet / route summarization questions but I don't > understand the answer, any help would be greatly appreciated. > > Q1) Choose the appropriate classless network address and broadcast > address for the IP address 10.6.38.50 with a subnet mask of > 255.255.240.0 > > A) 10.6.38.49 and 10.6.38.62 > > B) 10.6.32.0 and 10.6.47.255 > > C) 10.6.38.0 and 10.6.38.255 > > D) 10.0.0.0 and 10.255.255.255 > > Answer is B. No its not. The answer is 10.6.38.48 and 10.6.38.63. It probably meant to say classful. > Q2) Given a classless route summarization of 72.8.0.0 /13. Which IP > address fall into this scope? > > A) 72.15.36.8 > > B) 72.13.1.1 > > C) 72.8.20.10 > > D) 72.7.200.100 > > E) 72.16.7.4 > > F) 72.40.1.8 > > Answer is A, B & C - why isn't E the ansewr as well? The range of 72.8.0.0/13 is 72.8.0.0 - 72.15.255.255. Its 8 Class B's. > Q3) When using classless supernetting, which route best summarizes > the following networks? > > 192.168.9.0 > 192.168.10.0 > 192.168.11.0 > 192.168.12.0 > > A) 192.168.0.9 / 20 > > B) 192.168.0.0 / 16 > > C) 192.168.9.0 / 22 > > D) 192.168.8.0 / 21 > > I thought D is the answer, but the answer is C. A /22 is 4 Class C's, a /21 is 8. I recommand finding or making (to actually learn it) a subnet table and just keeping referencing it until you don't need to anymore. andy _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Subnet questions
Let's work through one or two of these to demonstrate what needs to happen. I've never tried to explain it to someone else before, so this will be good practice and I hope it makes sense! :-) > I have three subnet / route summarization questions but I don't > understand the answer, any help would be greatly appreciated. > > Q1)??? Choose the appropriate classless network address and broadcast > address for the IP address 10.6.38.50 with a subnet mask of > 255.255.240.0 > > A)??? 10.6.38.49 and 10.6.38.62 > > B)??? 10.6.32.0 and 10.6.47.255 > > C)??? 10.6.38.0 and 10.6.38.255 > > D)??? 10.0.0.0 and 10.255.255.255 > > Answer is B. > ? Ok, to really understand what is happening our first step is to convert the IP address and mask to binary: 1010.0110.00100110.00110010 = 10.6.38.50 ... = 255.255.240.0 Focus on the bit boundary where the mask changes from ones to zeroes. What is the place value of that right-most one? It's 16. So you know that your subnet boundaries, in decimal, will be in increments of 16, e.g. 10.6.0.0, 10.6.16.0, 10.6.32.0, 10.6.48.0, etc. You can see that 10.6.38.50 falls in the 10.6.32.0 subnet so that is the first part of the answer. For the second part of the answer, take the subnet address and convert all the host bits from zero to one. 1010.0110.0010 . = 10.6.32.0 1010.0110.0010 . = 10.6.47.255 There ya go, that's all there is to it. If you understand binary, it's fairly simple but it still takes a lot of practice to do it quickly. Let's do one more using basically the same approach. > > Q2)??? Given a classless route summarization of 72.8.0.0 /13.? Which IP > address fall into this scope? > > A)??? 72.15.36.8 > > B)??? 72.13.1.1 > > C)??? 72.8.20.10 > > D)??? 72.7.200.100 > > E)??? 72.16.7.4 > > F)??? 72.40.1.8 > > Answer is A, B & C - why isn't E the ansewr as well? > ? Start by converting the prefix and mask to binary. 01001000.1 000.. = 72.8.0.0 .1 000.. = 255.248.0.0 = /13 You can see, as was stated in the question, that 72.8.0.0 is the boundary for that prefix and mask. The place value of the last bit in the mask is 8. The next higher network with that mask would be 72.16.0.0, so the range of the 72.8 prefix is 72.8.0.0 - 72.15.255.255. A,B,and C are all in the 72.8.0.0/13 network. D is in 72.0.0.0/13, E is in 72.16.0.0/13, and F is in 72.40.0.0/13. Does that make sense? If not, there are others who are better at explaining this than I am. If this does make sense, work through the last few problems in your first post and post those results to the list. Work through it step by step, justifying each step as you go, and you'll quickly see how this all works together. HTH, John ___ Send a cool gift with your E-Card http://www.bluemountain.com/giftcenter/ _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: Subnet questions
I believe you're right about Q3. The answer should've been D, not C. Regards, Han-Song CCNP/MCSE/MCDBA -Original Message- From: Hunt Lee [mailto:[EMAIL PROTECTED]] Sent: Saturday, February 03, 2001 3:11 PM To: [EMAIL PROTECTED] Subject: Subnet questions I have three subnet / route summarization questions but I don't understand the answer, any help would be greatly appreciated. Q1) Choose the appropriate classless network address and broadcast address for the IP address 10.6.38.50 with a subnet mask of 255.255.240.0 A) 10.6.38.49 and 10.6.38.62 B) 10.6.32.0 and 10.6.47.255 C) 10.6.38.0 and 10.6.38.255 D) 10.0.0.0 and 10.255.255.255 Answer is B. Q2) Given a classless route summarization of 72.8.0.0 /13. Which IP address fall into this scope? A) 72.15.36.8 B) 72.13.1.1 C) 72.8.20.10 D) 72.7.200.100 E) 72.16.7.4 F) 72.40.1.8 Answer is A, B & C - why isn't E the ansewr as well? Q3) When using classless supernetting, which route best summarizes the following networks? 192.168.9.0 192.168.10.0 192.168.11.0 192.168.12.0 A) 192.168.0.9 / 20 B) 192.168.0.0 / 16 C) 192.168.9.0 / 22 D) 192.168.8.0 / 21 I thought D is the answer, but the answer is C. P.S. Is there anywhere I can get more practice on these type of questions? Regards, Hunt Lee IP Solution Analyst Cable and Wireless (Sydney) _ 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: Subnet questions
At 10:11 AM 2/4/01, Hunt Lee wrote: >I have three subnet / route summarization questions but I don't >understand the answer, any help would be greatly appreciated. > >Q1)Choose the appropriate classless network address and broadcast >address for the IP address 10.6.38.50 with a subnet mask of >255.255.240.0 > >A)10.6.38.49 and 10.6.38.62 > >B)10.6.32.0 and 10.6.47.255 > >C)10.6.38.0 and 10.6.38.255 > >D)10.0.0.0 and 10.255.255.255 > >Answer is B. Answer B looks right to me. Node 10.6.38.50 is on network 10.6.32.0. In the third octet, the first four bits are network bits. In the third octet, the only bit of the first four bits that is on in the number 38 is the 2^5 bit. For broadcast turn on all node bits: the last four bits of the third octet and all eight bits of the fourth octet. Also turn on the 2^5 bit in the third octet. > > >Q2)Given a classless route summarization of 72.8.0.0 /13. Which IP >address fall into this scope? > >A)72.15.36.8 > >B)72.13.1.1 > >C)72.8.20.10 > >D)72.7.200.100 > >E)72.16.7.4 > >F)72.40.1.8 > >Answer is A, B & C - why isn't E the ansewr as well? If I understand the question right, you should be looking for the answers that share the same left-most 13 bits. The first octet is the same for all of them, so concentrate on the second octet. Put the second octet into binary. A, B, and C are all 1 in the left-most 5 bits of the second octet. The rest aren't. > > >Q3)When using classless supernetting, which route best summarizes >the following networks? > >192.168.9.0 >192.168.10.0 >192.168.11.0 >192.168.12.0 > >A)192.168.0.9 / 20 > >B)192.168.0.0 / 16 > >C)192.168.9.0 / 22 > >D)192.168.8.0 / 21 > >I thought D is the answer, but the answer is C. I think it's D also. If you go to the 22nd bit, then 192.168.12.0 is different than the others. > > >P.S. Is there anywhere I can get more practice on these type of >questions? > >Regards, >Hunt Lee >IP Solution Analyst >Cable and Wireless (Sydney) > > > >_ >FAQ, list archives, and subscription info: >http://www.groupstudy.com/list/cisco.html >Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Priscilla Oppenheimer http://www.priscilla.com _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Subnet questions
B is the correct answer. - Original Message - From: Andy <[EMAIL PROTECTED]> To: Hunt Lee <[EMAIL PROTECTED]> Cc: <[EMAIL PROTECTED]> Sent: Saturday, February 03, 2001 9:40 AM Subject: Re: Subnet questions > > > On Sun, 4 Feb 2001, Hunt Lee wrote: > > > I have three subnet / route summarization questions but I don't > > understand the answer, any help would be greatly appreciated. > > > > Q1) Choose the appropriate classless network address and broadcast > > address for the IP address 10.6.38.50 with a subnet mask of > > 255.255.240.0 > > > > A) 10.6.38.49 and 10.6.38.62 > > > > B) 10.6.32.0 and 10.6.47.255 > > > > C) 10.6.38.0 and 10.6.38.255 > > > > D) 10.0.0.0 and 10.255.255.255 > > > > Answer is B. > > No its not. The answer is 10.6.38.48 and 10.6.38.63. It probably meant to > say classful. > > > Q2) Given a classless route summarization of 72.8.0.0 /13. Which IP > > address fall into this scope? > > > > A) 72.15.36.8 > > > > B) 72.13.1.1 > > > > C) 72.8.20.10 > > > > D) 72.7.200.100 > > > > E) 72.16.7.4 > > > > F) 72.40.1.8 > > > > Answer is A, B & C - why isn't E the ansewr as well? > > The range of 72.8.0.0/13 is 72.8.0.0 - 72.15.255.255. Its 8 Class B's. > > > Q3) When using classless supernetting, which route best summarizes > > the following networks? > > > > 192.168.9.0 > > 192.168.10.0 > > 192.168.11.0 > > 192.168.12.0 > > > > A) 192.168.0.9 / 20 > > > > B) 192.168.0.0 / 16 > > > > C) 192.168.9.0 / 22 > > > > D) 192.168.8.0 / 21 > > > > I thought D is the answer, but the answer is C. > > A /22 is 4 Class C's, a /21 is 8. I recommand finding or making (to > actually learn it) a subnet table and just keeping referencing it until > you don't need to anymore. > > andy > > _ > 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: Subnet questions
Yeah, misread the subnet, I see it now. On Sat, 3 Feb 2001, Groupstudy wrote: > B is the correct answer. > > - Original Message - > From: Andy <[EMAIL PROTECTED]> > To: Hunt Lee <[EMAIL PROTECTED]> > Cc: <[EMAIL PROTECTED]> > Sent: Saturday, February 03, 2001 9:40 AM > Subject: Re: Subnet questions > > > > > > > > On Sun, 4 Feb 2001, Hunt Lee wrote: > > > > > I have three subnet / route summarization questions but I don't > > > understand the answer, any help would be greatly appreciated. > > > > > > Q1) Choose the appropriate classless network address and broadcast > > > address for the IP address 10.6.38.50 with a subnet mask of > > > 255.255.240.0 > > > > > > A) 10.6.38.49 and 10.6.38.62 > > > > > > B) 10.6.32.0 and 10.6.47.255 > > > > > > C) 10.6.38.0 and 10.6.38.255 > > > > > > D) 10.0.0.0 and 10.255.255.255 > > > > > > Answer is B. > > > > No its not. The answer is 10.6.38.48 and 10.6.38.63. It probably meant to > > say classful. > > > > > Q2) Given a classless route summarization of 72.8.0.0 /13. Which IP > > > address fall into this scope? > > > > > > A) 72.15.36.8 > > > > > > B) 72.13.1.1 > > > > > > C) 72.8.20.10 > > > > > > D) 72.7.200.100 > > > > > > E) 72.16.7.4 > > > > > > F) 72.40.1.8 > > > > > > Answer is A, B & C - why isn't E the ansewr as well? > > > > The range of 72.8.0.0/13 is 72.8.0.0 - 72.15.255.255. Its 8 Class B's. > > > > > Q3) When using classless supernetting, which route best summarizes > > > the following networks? > > > > > > 192.168.9.0 > > > 192.168.10.0 > > > 192.168.11.0 > > > 192.168.12.0 > > > > > > A) 192.168.0.9 / 20 > > > > > > B) 192.168.0.0 / 16 > > > > > > C) 192.168.9.0 / 22 > > > > > > D) 192.168.8.0 / 21 > > > > > > I thought D is the answer, but the answer is C. > > > > A /22 is 4 Class C's, a /21 is 8. I recommand finding or making (to > > actually learn it) a subnet table and just keeping referencing it until > > you don't need to anymore. > > > > andy > > > > _ > > 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] > _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Subnet questions
I don't want to explain, it will take me too long. There have been a number of threads regarding subnet addressing lately and they had some good examples to examine. Search the archives. Be patient, learning to subnet and summarize off the top of your head requires some time and practice. The best way to learn is to just sit down and play with binary. Take a look at the following URL's for complete discussions on this topic. I think you will get what you need from them: http://www.cisco.com/univercd/cc/td/doc/cisintwk/idg4/nd20a.htm http://www.3com.com/nsc/501302.html - Original Message - From: Han-Song Kim <[EMAIL PROTECTED]> To: 'Groupstudy' <[EMAIL PROTECTED]> Sent: Saturday, February 03, 2001 8:10 PM Subject: RE: Subnet questions > Sorry about the previous response. I thought you're responding back to my > earlier e-mail. Still, why is the answer to Q3 C, not D? > > > > -Original Message- > From: Groupstudy [mailto:[EMAIL PROTECTED]] > Sent: Saturday, February 03, 2001 7:31 PM > To: [EMAIL PROTECTED] > Subject: Re: Subnet questions > > > B is the correct answer. > > - Original Message - > From: Andy <[EMAIL PROTECTED]> > To: Hunt Lee <[EMAIL PROTECTED]> > Cc: <[EMAIL PROTECTED]> > Sent: Saturday, February 03, 2001 9:40 AM > Subject: Re: Subnet questions > > > > > > > > On Sun, 4 Feb 2001, Hunt Lee wrote: > > > > > I have three subnet / route summarization questions but I don't > > > understand the answer, any help would be greatly appreciated. > > > > > > Q1) Choose the appropriate classless network address and broadcast > > > address for the IP address 10.6.38.50 with a subnet mask of > > > 255.255.240.0 > > > > > > A) 10.6.38.49 and 10.6.38.62 > > > > > > B) 10.6.32.0 and 10.6.47.255 > > > > > > C) 10.6.38.0 and 10.6.38.255 > > > > > > D) 10.0.0.0 and 10.255.255.255 > > > > > > Answer is B. > > > > No its not. The answer is 10.6.38.48 and 10.6.38.63. It probably meant to > > say classful. > > > > > Q2) Given a classless route summarization of 72.8.0.0 /13. Which IP > > > address fall into this scope? > > > > > > A) 72.15.36.8 > > > > > > B) 72.13.1.1 > > > > > > C) 72.8.20.10 > > > > > > D) 72.7.200.100 > > > > > > E) 72.16.7.4 > > > > > > F) 72.40.1.8 > > > > > > Answer is A, B & C - why isn't E the ansewr as well? > > > > The range of 72.8.0.0/13 is 72.8.0.0 - 72.15.255.255. Its 8 Class B's. > > > > > Q3) When using classless supernetting, which route best summarizes > > > the following networks? > > > > > > 192.168.9.0 > > > 192.168.10.0 > > > 192.168.11.0 > > > 192.168.12.0 > > > > > > A) 192.168.0.9 / 20 > > > > > > B) 192.168.0.0 / 16 > > > > > > C) 192.168.9.0 / 22 > > > > > > D) 192.168.8.0 / 21 > > > > > > I thought D is the answer, but the answer is C. > > > > A /22 is 4 Class C's, a /21 is 8. I recommand finding or making (to > > actually learn it) a subnet table and just keeping referencing it until > > you don't need to anymore. > > > > andy > > > > _ > > 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] > _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Subnet questions
You are exactly right. Well done. - Original Message - From: Han-Song Kim <[EMAIL PROTECTED]> To: 'Groupstudy' <[EMAIL PROTECTED]> Sent: Sunday, February 04, 2001 1:38 AM Subject: RE: Subnet questions > Ok, I looked into the resources that you've referred to, and put a little > more thought into this question. I think I can see why the answer could be > C on this problem, which makes this question a little tricky. > > If you could bare with me, let me just go through my logic and you can just > tell me if I'm on the right track or not. > > So, we're given the networks, > > 192.168.9.0 (192.168. 1001. ) > 192.168.10.0 (192.168. 1010. ) > 192.168.11.0 (192.168. 1011. ) and > 192.168.12.0 (192.168. 1100. ). > > Keeping in mind that the question asks for the "best" summarization... since > 192.168.8.0/21 would include additional networks not mentioned in the > problem (i.e. 192.168.13.0, 192.168.14.0, etc.), I can see how this might > not be the best answer. > > 192.168.9.0/22, on the other hand, is the "best" summarization for the first > three networks. The last network has no other networks to be summarized > with, therefore can be left out of the summarization. > > Is this the right reasoning for the correct answer being C? > > > > Regards, > > Han-Song Kim > Network Engineer, CCNP/ MCSE/ MCDBA > Planetary Networks > (W)408.745.3065 (C)408.910.7907 > [EMAIL PROTECTED] > > > > > -Original Message- > From: Groupstudy [mailto:[EMAIL PROTECTED]] > Sent: Saturday, February 03, 2001 11:51 PM > To: [EMAIL PROTECTED] > Subject: Re: Subnet questions > > > I don't want to explain, it will take me too long. There have been a number > of threads regarding subnet addressing lately and they had some good > examples to examine. Search the archives. > > Be patient, learning to subnet and summarize off the top of your head > requires some time and practice. The best way to learn is to just sit down > and play with binary. > > Take a look at the following URL's for complete discussions on this topic. > I think you will get what you need from them: > > http://www.cisco.com/univercd/cc/td/doc/cisintwk/idg4/nd20a.htm > > http://www.3com.com/nsc/501302.html > > > - Original Message - > From: Han-Song Kim <[EMAIL PROTECTED]> > To: 'Groupstudy' <[EMAIL PROTECTED]> > Sent: Saturday, February 03, 2001 8:10 PM > Subject: RE: Subnet questions > > > > Sorry about the previous response. I thought you're responding back to my > > earlier e-mail. Still, why is the answer to Q3 C, not D? > > > > > > > > -Original Message- > > From: Groupstudy [mailto:[EMAIL PROTECTED]] > > Sent: Saturday, February 03, 2001 7:31 PM > > To: [EMAIL PROTECTED] > > Subject: Re: Subnet questions > > > > > > B is the correct answer. > > > > - Original Message - > > From: Andy <[EMAIL PROTECTED]> > > To: Hunt Lee <[EMAIL PROTECTED]> > > Cc: <[EMAIL PROTECTED]> > > Sent: Saturday, February 03, 2001 9:40 AM > > Subject: Re: Subnet questions > > > > > > > > > > > > > On Sun, 4 Feb 2001, Hunt Lee wrote: > > > > > > > I have three subnet / route summarization questions but I don't > > > > understand the answer, any help would be greatly appreciated. > > > > > > > > Q1) Choose the appropriate classless network address and broadcast > > > > address for the IP address 10.6.38.50 with a subnet mask of > > > > 255.255.240.0 > > > > > > > > A) 10.6.38.49 and 10.6.38.62 > > > > > > > > B) 10.6.32.0 and 10.6.47.255 > > > > > > > > C) 10.6.38.0 and 10.6.38.255 > > > > > > > > D) 10.0.0.0 and 10.255.255.255 > > > > > > > > Answer is B. > > > > > > No its not. The answer is 10.6.38.48 and 10.6.38.63. It probably meant > to > > > say classful. > > > > > > > Q2) Given a classless route summarization of 72.8.0.0 /13. Which IP > > > > address fall into this scope? > > > > > > > > A) 72.15.36.8 > > > > > > > > B) 72.13.1.1 > > > > > > > > C) 72.8.20.10 > > > > > > > > D) 72.7.200.100 > > > > > > > > E) 72.16.7.4 > > > > > > > > F) 72.40.1.8 > > > > > > > > Answer is A, B & C - w
Re: Subnet questions
Just wanted to correct my response to your question regarding classless supernetting. Thanks to "Groupstudy" who help me realize my wrong reasoning for answering the question: Q3) When using classless supernetting, which route best summarizes > > > > the following networks? > > > > > > > > 192.168.9.0 > > > > 192.168.10.0 > > > > 192.168.11.0 > > > > 192.168.12.0 > > > > > > > > A) 192.168.0.9 / 20 > > > > B) 192.168.0.0 / 16 > > > > C) 192.168.9.0 / 22 > > > > D) 192.168.8.0 / 21 The correct answer is indeed C if you carefully look at the problem. Notice that the question asks for the "best" summarization. If you choose D as the answer, then you will be including networks not mentioned in the problem (i.e. 192.168.13.0, 192.168.14.0, etc.). 192.168.9.0/22, on the other hand, is the "best" summarization for the first 3 networks since it doesn't include any unmentioned networks. The forth network has no other networks to be summarized with and is not relevant to summarization. The key is not to try to summarize all four networks (which is not required according to how the question is worded) like I did the first time, : ) , but to come up with the "best" summarization, which the problem explicitly asks for. Hope this was helpful to you! regards, Han-Song CCNP/MCSE/MCDBA _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Subnet questions
My pleasure. Now that you have a handle on the subnetting business, take a look at this thread and see if you can tell this guy what is wrong with his setup, and why he cannot ping the 10.1.1.1 address. Thread: Frame relay ppoint vs. multi: What's difference? Why can you not ping my own multipoint interface but if it is a point to point is does work? See below interface Serial1 no ip address encapsulation frame-relay ! interface Serial1.1 multipoint ip address 10.1.1.1 255.255.255.252 frame-relay interface-dlci 110 ! router igrp 10 network 10.0.0.0 1 commserver#ping 10.1.1.1 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 10.1.1.1, timeout is 2 seconds: . Success rate is 0 percent (0/5) = -- interface Serial0 no ip address encapsulation frame-relay no fair-queue ! interface Serial0.1 point-to-point ip address 10.1.1.1 255.255.255.252 frame-relay interface-dlci 110 =20 ! interface Serial1 no ip address encapsulation frame-relay shutdown ! router igrp 10 network 10.0.0.0 ! =20 commserver#ping 10.1.1.1 =20 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 10.1.1.1, timeout is 2 seconds: ! Success rate is 100 percent (5/5), round-trip min/avg/max =3D = 112/116/128 ms - Original Message - From: Han-Song Kim <[EMAIL PROTECTED]> To: 'Groupstudy' <[EMAIL PROTECTED]> Sent: Sunday, February 04, 2001 2:25 AM Subject: RE: Subnet questions > Thank you bunch for helping me realize my mistakes!! :) > > regards, > Han-Song > > > > -Original Message- > From: Groupstudy [mailto:[EMAIL PROTECTED]] > Sent: Sunday, February 04, 2001 1:48 AM > To: [EMAIL PROTECTED] > Subject: Re: Subnet questions > > > You are exactly right. Well done. > > - Original Message - > From: Han-Song Kim <[EMAIL PROTECTED]> > To: 'Groupstudy' <[EMAIL PROTECTED]> > Sent: Sunday, February 04, 2001 1:38 AM > Subject: RE: Subnet questions > > > > Ok, I looked into the resources that you've referred to, and put a little > > more thought into this question. I think I can see why the answer could > be > > C on this problem, which makes this question a little tricky. > > > > If you could bare with me, let me just go through my logic and you can > just > > tell me if I'm on the right track or not. > > > > So, we're given the networks, > > > > 192.168.9.0 (192.168. 1001. ) > > 192.168.10.0 (192.168. 1010. ) > > 192.168.11.0 (192.168. 1011. ) and > > 192.168.12.0 (192.168. 1100. ). > > > > Keeping in mind that the question asks for the "best" summarization... > since > > 192.168.8.0/21 would include additional networks not mentioned in the > > problem (i.e. 192.168.13.0, 192.168.14.0, etc.), I can see how this might > > not be the best answer. > > > > 192.168.9.0/22, on the other hand, is the "best" summarization for the > first > > three networks. The last network has no other networks to be summarized > > with, therefore can be left out of the summarization. > > > > Is this the right reasoning for the correct answer being C? > > > > > > > > Regards, > > > > Han-Song Kim > > Network Engineer, CCNP/ MCSE/ MCDBA > > Planetary Networks > > (W)408.745.3065 (C)408.910.7907 > > [EMAIL PROTECTED] > > > > > > > > > > -Original Message- > > From: Groupstudy [mailto:[EMAIL PROTECTED]] > > Sent: Saturday, February 03, 2001 11:51 PM > > To: [EMAIL PROTECTED] > > Subject: Re: Subnet questions > > > > > > I don't want to explain, it will take me too long. There have been a > number > > of threads regarding subnet addressing lately and they had some good > > examples to examine. Search the archives. > > > > Be patient, learning to subnet and summarize off the top of your head > > requires some time and practice. The best way to learn is to just sit > down > > and play with binary. > > > > Take a look at the following URL's for complete discussions on this topic. > > I think you will get what you need from them: > > > > http://www.cisco.com/univercd/cc/td/doc/cisintwk/idg4/nd20a.htm > > > > http://www.3com.com/nsc/501302.html > > > > > > - Original Message - > > From: Han-Song Kim <[EMAIL PROTECTED]> > > To: 'Groupstudy' <[EMAIL PROTECTED]> > > Sent: Saturday, February 03, 2001 8:10 PM > > Subject: RE: Subnet questions >
Re: Subnet questions
> > > Ok, I looked into the resources that you've referred to, and put a little > > more thought into this question. Make sure the resources cover supernetting and not just subnetting. The goal of supernetting is to group routes together so that a router reduces the number of routes it tells other routers about. That's very different from subnetting where the goal is to subdivide the network number assigned to you by your ISP or ARIN. > > So, we're given the networks, > > > > 192.168.9.0 (192.168. 1001. ) > > 192.168.10.0 (192.168. 1010. ) > > 192.168.11.0 (192.168. 1011. ) and > > 192.168.12.0 (192.168. 1100. ). The question was, "When using classless supernetting, which route best summarizes the following networks?" So we're looking for one route that will let us tell other routers about our four networks. The possible answers were: A)192.168.0.9 / 20 obviously wrong because of the .9 at the end B)192.168.0.0 / 16 this could work, but it's less specific than answer D C)192.168.9.0 / 22 this doesn't work because it leaves out 192.168.12.0, plus it would be stupid to use .9 when the one bit isn't even referred to with a /22. The one bit is in the node ID (suffix) part of the addresses. D)192.168.8.0 / 21 this works > > > > Keeping in mind that the question asks for the "best" summarization... >since > > 192.168.8.0/21 would include additional networks not mentioned in the > > problem (i.e. 192.168.13.0, 192.168.14.0, etc.), I can see how this might > > not be the best answer. With a /21, the one bit and two bit don't matter so 13 and 14 don't matter. Those bits are in the node part when we use /21. > > > > 192.168.9.0/22, on the other hand, is the "best" summarization for the >first > > three networks. The last network has no other networks to be summarized > > with, therefore can be left out of the summarization. The goal is to group all four networks. Leaving out one would cause you not to meet that goal. I think D is the right answer. Priscilla > > > > Is this the right reasoning for the correct answer being C? > > > > > > > > Regards, > > > > Han-Song Kim > > Network Engineer, CCNP/ MCSE/ MCDBA > > Planetary Networks > > (W)408.745.3065 (C)408.910.7907 > > [EMAIL PROTECTED] Priscilla Oppenheimer http://www.priscilla.com _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Subnet questions
> > > Ok, I looked into the resources that you've referred to, and put a little > > more thought into this question. Make sure the resources cover supernetting and not just subnetting. The goal of supernetting is to group routes together so that a router reduces the number of routes it tells other routers about. That's very different from subnetting where the goal is to subdivide the network number assigned to you by your ISP or ARIN. > > So, we're given the networks, > > > > 192.168.9.0 (192.168. 1001. ) > > 192.168.10.0 (192.168. 1010. ) > > 192.168.11.0 (192.168. 1011. ) and > > 192.168.12.0 (192.168. 1100. ). The question was, "When using classless supernetting, which route best summarizes the following networks?" So we're looking for one route that will let us tell all other routers about our four networks. The possible answers were: A)192.168.0.9 / 20 obviously wrong because of the .9 at the end B)192.168.0.0 / 16 this could work, but it's less specific than answer D C)192.168.9.0 / 22 this doesn't work because it leaves out 192.168.12.0, plus it would be stupid to use .9 when the one bit isn't even referred to with a /22. The one bit is in the node ID (suffix) part of the addresses. D)192.168.8.0 / 21 this works > > > > Keeping in mind that the question asks for the "best" summarization... >since > > 192.168.8.0/21 would include additional networks not mentioned in the > > problem (i.e. 192.168.13.0, 192.168.14.0, etc.), I can see how this might > > not be the best answer. With a /21, the one bit and two bit don't matter so 13 and 14 don't matter. Those bits are in the node part when we use /21. > > > > 192.168.9.0/22, on the other hand, is the "best" summarization for the >first > > three networks. The last network has no other networks to be summarized > > with, therefore can be left out of the summarization. The goal is to group all four networks. Leaving out one would cause you not to meet that goal. I think D is the right answer. Priscilla > > > > Is this the right reasoning for the correct answer being C? > > > > > > > > Regards, > > > > Han-Song Kim > > Network Engineer, CCNP/ MCSE/ MCDBA > > Planetary Networks > > (W)408.745.3065 (C)408.910.7907 > > [EMAIL PROTECTED] > > > > > > > > > > -Original Message- > > From: Groupstudy [mailto:[EMAIL PROTECTED]] > > Sent: Saturday, February 03, 2001 11:51 PM > > To: [EMAIL PROTECTED] > > Subject: Re: Subnet questions > > > > > > I don't want to explain, it will take me too long. There have been a >number > > of threads regarding subnet addressing lately and they had some good > > examples to examine. Search the archives. > > > > Be patient, learning to subnet and summarize off the top of your head > > requires some time and practice. The best way to learn is to just sit >down > > and play with binary. > > > > Take a look at the following URL's for complete discussions on this topic. > > I think you will get what you need from them: > > > > http://www.cisco.com/univercd/cc/td/doc/cisintwk/idg4/nd20a.htm > > > > http://www.3com.com/nsc/501302.html > > > > > > - Original Message - > > From: Han-Song Kim <[EMAIL PROTECTED]> > > To: 'Groupstudy' <[EMAIL PROTECTED]> > > Sent: Saturday, February 03, 2001 8:10 PM > > Subject: RE: Subnet questions > > > > > > > Sorry about the previous response. I thought you're responding back to >my > > > earlier e-mail. Still, why is the answer to Q3 C, not D? > > > > > > > > > > > > -Original Message- > > > From: Groupstudy [mailto:[EMAIL PROTECTED]] > > > Sent: Saturday, February 03, 2001 7:31 PM > > > To: [EMAIL PROTECTED] > > > Subject: Re: Subnet questions > > > > > > > > > B is the correct answer. > > > > > > - Original Message - > > > From: Andy <[EMAIL PROTECTED]> > > > To: Hunt Lee <[EMAIL PROTECTED]> > > > Cc: <[EMAIL PROTECTED]> > > > Sent: Saturday, February 03, 2001 9:40 AM > > > Subject: Re: Subnet questions > > > > > > > > > > > > > > > > > > On Sun, 4 Feb 2001, Hunt Lee wrote: > > > > > > > > > I have three subnet / route summarization questions but I don't > > > > > understan
Re: Subnet questions
It did not say you had to summarize into one route. Answer C means you would need two routes, but it is better than advertising networks which do not originate from your domain... - Original Message - From: Priscilla Oppenheimer <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Sunday, February 04, 2001 3:26 PM Subject: Re: Subnet questions > > > > > > Ok, I looked into the resources that you've referred to, and put a little > > > more thought into this question. > > Make sure the resources cover supernetting and not just subnetting. The > goal of supernetting is to group routes together so that a router reduces > the number of routes it tells other routers about. That's very different > from subnetting where the goal is to subdivide the network number assigned > to you by your ISP or ARIN. > > > > > So, we're given the networks, > > > > > > 192.168.9.0 (192.168. 1001. ) > > > 192.168.10.0 (192.168. 1010. ) > > > 192.168.11.0 (192.168. 1011. ) and > > > 192.168.12.0 (192.168. 1100. ). > > The question was, "When using classless supernetting, which route best > summarizes the following networks?" > > So we're looking for one route that will let us tell other routers about > our four networks. The possible answers were: > > A)192.168.0.9 / 20 obviously wrong because of the .9 at the end > > B)192.168.0.0 / 16 this could work, but it's less specific than answer D > > C)192.168.9.0 / 22 this doesn't work because it leaves out > 192.168.12.0, plus it would be stupid to use .9 when the one bit isn't even > referred to with a /22. The one bit is in the node ID (suffix) part of the > addresses. > > D)192.168.8.0 / 21 this works > > > > > > > > Keeping in mind that the question asks for the "best" summarization... > >since > > > 192.168.8.0/21 would include additional networks not mentioned in the > > > problem (i.e. 192.168.13.0, 192.168.14.0, etc.), I can see how this might > > > not be the best answer. > > With a /21, the one bit and two bit don't matter so 13 and 14 don't matter. > Those bits are in the node part when we use /21. > > > > > > > 192.168.9.0/22, on the other hand, is the "best" summarization for the > >first > > > three networks. The last network has no other networks to be summarized > > > with, therefore can be left out of the summarization. > > The goal is to group all four networks. Leaving out one would cause you not > to meet that goal. I think D is the right answer. > > Priscilla > > > > > > > Is this the right reasoning for the correct answer being C? > > > > > > > > > > > > Regards, > > > > > > Han-Song Kim > > > Network Engineer, CCNP/ MCSE/ MCDBA > > > Planetary Networks > > > (W)408.745.3065 (C)408.910.7907 > > > [EMAIL PROTECTED] > > > > > Priscilla Oppenheimer > http://www.priscilla.com > > _ > 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]
