VLSM Design Drill #2
The boss of our #CCNA is at it again today with another VLSM project. The scenario helps you exercise your brain in a VLSM world. As with all the VLSM design drills, you are given an existing internetwork with some pre-existing subnets, and you need to add some new subnet(s) to the design. What subnet would you pick so you don’t cause an overlap? Today’s post lists the question; next time, the answer. Details below the fold.
Your boss wants you to add a subnet to an existing design. The existing design already has these five subnets:
- 192.168.1.168/29
- 192.168.1.240/28
- 192.168.1.128/29
- 192.168.1.96/30
- 192.168.1.192/27
The boss has made these choices:
- He will add 3 new subnets
- All subnets will be part of class C network 192.168.1.0
- He will use one mask only for all the new subnets
- He has not decided which mask yet
- He wants to use the numerically highest possible subnet numbers
While the boss works to make his final choice for a mask, he wants you to do the planning. He has narrowed down the choices to three masks, as listed here. Your job: for each mask, find the three subnet IDs that would meet all the criteria, without overlapping the existing subnets.
1) /29
2) /28
3) /27
Ask questions if you have them. Also, check out the ICND1 100-101 Cert Guide’s chapter 20 for some tips on finding these overlaps, or check the other VLSM drills here in the blog.