The solution is wrong and this is becoming real embarressement. Se0/2/1 on R6 should be configured as:
int ser0/2/1 ip address 172.16.69.2 255.255.255.254 ! However, I think the question may have been misunderstood by the person solving the lab in a sense that there are two obvious solutions - one is to subnet /30 into two /31 subnets and the other one is to create multilink PPP between R6 and R9 and use /30 mask. I will talk to the original developer to take a closer look. This has, for now, been changed in our development copy to 2x /31. Keep up the good work, Bauke! -- Marko Milivojevic - CCIE #18427 Senior Technical Instructor - IPexpert Mailto: [email protected] Telephone: +1.810.326.1444 Fax: +1.810.454.0130 Community: http://www.ipexpert.com/communities On Wed, Dec 30, 2009 at 01:24, Bauke Dzavhale <[email protected] > wrote: > Team, > > Can someone help clarify the ip add assignment on R6 and R9, Task 2-2 LAB5- > Vol2 DSG? > > We are give the subnet 172.16.69.0/30 to be used and we have 4 interfaces > (s0/2/0, s0/2/1) on both R6 and R9. > This is my understanding: > > 1- The subnet gives us 4 ip addresses: 172.16.69.0, 172.16.69.1, > 172.16.69.2, 172.16.69.3, with *.0* and * .3* being subnet and > broadcast address respectively. > > There is 2 approaches here: > a) If I did not have the restriction to use /30 subnet, I would open up the > range and I would use a /29 subnet, which would give me enough [6 usable] ip > addresses to assign to my 4 interfaces. > b) Since I have the /30 restriction in place I will use the 4 ip addresses > indicated above for my 4 serial interfaces [provided ip classless is in > place], and this allows me to do the following: > > In R6: > int s0/2/0 > ip add 172.16.69.0 255.255.255*.252* > > int s0/2/1 > ip add 172.16.69.*2 * 255.255.255.*252* > > > In R9: > int s0/2/0 > ip add 172.16.69*.1* 255.255.255.*252* > > int s0/2/1 > ip add 172.16.69.3* * 255.255.255.*252* > > The solution assigns the same ip add [172.16.69.*0 * 255.255.255.*254*] > to both s0/2/0 and s0/2/1 on R6, and the remaining (.1 and .3 ) are > assigned to R9. > > My obvious question are: > - Can we do this on R6? The *.2* has not even been used but s0/2/0 and > s0/2/1 share the same ip add [*.0*] on R6.... > - Why change the mask to 255.255.255.*254* (/31) ? The requirement is to > use /30. > > > Thanks > > B. > > ------------------------------ > *All new Yahoo! Mail - * <http://ca.promos.yahoo.com/newmail/overview2/>Get > a sneak peak at messages with a handy reading pane. > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > >
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