From the course: Learning Subnetting
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Practice exercise #7
From the course: Learning Subnetting
Practice exercise #7
- [Instructor] Let's take a look at another practice exercise. This one is a troubleshooting example. We have an incorrectly assigned PC on this network and we need you to determine what is that PC? Is it PC one, two, three or four? Given this scenario, given this topology, which PC has the incorrect IP address? Now the assumption we're going to make going in, is that the router IP addresses are correct. We're going to assume that for VLAN A, the router has an IP address of 172.16.90.255/20. We're going to assume that that is valid. And the other IP address on router R1 for VLAN B, 172.16.208.255/20, we're going to assume that that is valid as well. Now, I've seen some students get really tripped up on this part. They'll see that 255 in the fourth octet and they'll say, "Hold on. That's not valid." "You cannot have a 255 in the last octet." Actually, yes you can. It all depends on your subnet mask. If we had a 24-bit subnet mask, I would agree. That would be a problem. That would be…
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