An Example of Finding a VLSM Overlap
For example, imagine that a practice question for the CCENT exam shows Figure 20-2. It uses a single Class B network (172.16.0.0), with VLSM, because it uses three different masks: /23, /24, and /30.
Figure 20-2 VLSM Design with Possible Overlap
Now imagine that the exam question shows you the figure, and either directly or indirectly asks whether overlapping subnets exist. This type of question might simply tell you that some hosts cannot ping each other, or it might not even mention that the root cause could be that some of the subnets overlap. To answer such a question, you could follow this simple but ...
Get CCENT/CCNA ICND1 100-101 Official Cert Guide now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
