1
00:00:02,190 --> 00:00:08,160
Now, to be honest, there are a number of different types of villain attacks in modern switched networks.

2
00:00:08,340 --> 00:00:14,400
The villain architecture simplifies network maintenance and improves performance, but it also opens

3
00:00:14,400 --> 00:00:15,870
the door to abuse.

4
00:00:15,870 --> 00:00:22,620
So it's important to understand the general methodology behind these attacks and the primary approaches

5
00:00:22,620 --> 00:00:23,790
to mitigate them.

6
00:00:24,550 --> 00:00:29,890
Vlan hopping enables traffic from one vlan to be seen by another.

7
00:00:29,890 --> 00:00:30,580
Vlan.

8
00:00:31,370 --> 00:00:32,780
Sounds kind of fun, huh?

9
00:00:35,150 --> 00:00:42,260
So as we've already seen before, a virtual local area network, virtual LAN or Vlan, is a group of

10
00:00:42,260 --> 00:00:48,590
hosts with a common set of requirements which communicate as if they were attached to the same broadcast

11
00:00:48,590 --> 00:00:51,650
domain regardless of their physical location.

12
00:00:52,320 --> 00:00:59,310
VLANs work by applying tags to network packets and handling these tags in networking systems, creating

13
00:00:59,310 --> 00:01:06,090
the appearance and functionality of network traffic that is physically on a single network but acts

14
00:01:06,120 --> 00:01:09,240
as if it is split between separate networks.

15
00:01:10,110 --> 00:01:10,790
Capiche?

16
00:01:14,550 --> 00:01:19,020
So let's take a moment and remember the reasons of why we are using VLANs.

17
00:01:19,920 --> 00:01:20,700
Security.

18
00:01:21,550 --> 00:01:25,840
Groups that have sensitive data are separated from the rest of the network.

19
00:01:27,440 --> 00:01:28,760
Cost reduction.

20
00:01:29,360 --> 00:01:34,190
Cost savings result from less of a need for expensive network upgrades.

21
00:01:35,640 --> 00:01:36,930
Higher performance.

22
00:01:37,320 --> 00:01:43,080
The number of router hops reduces and the apparent bandwidth for network users increases.

23
00:01:44,270 --> 00:01:46,430
Broadcast storm mitigation.

24
00:01:47,080 --> 00:01:50,950
Every Vlan only receives its own broadcast packets.

25
00:01:52,860 --> 00:01:55,500
Improved IT staff efficiency.

26
00:01:56,410 --> 00:02:00,490
As we were talking about before VLANs, make it easier to manage the network.

27
00:02:00,700 --> 00:02:03,460
It also simplifies the company's management.