O'Reilly logo

CCNA® Cisco Certified Network Associate: Study Guide, Seventh Edition by Todd Lammle

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

VLAN Basics

Figure 11-1 shows how layer 2 switched networks are typically designed—as flat networks. With this configuration, every broadcast packet transmitted is seen by every device on the network regardless of whether the device needs to receive that data or not.

Figure 11-1: Flat network structure

f1101.eps

By default, routers allow broadcasts to occur only within the originating network, while switches forward broadcasts to all segments. Oh, and by the way, the reason it’s called a flat network is because it’s one broadcast domain, not because the actual design is physically flat. In Figure 11-1 we see Host A sending out a broadcast and all ports ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required