O'Reilly logo

CCIE Fundamentals: Network Design and Case Studies, Second Edition by Cisco Systems, Inc.

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

Appendix E. Broadcasts in Switched LAN Networks

To communicate with all or part of the network, protocols use broadcast and multicast datagrams at Layer 2 of the Open Systems Interconnection (OSI) model. This obviously supposes a medium that supports broadcasting (such as Ethernet, for instance). When a node needs to communicate with every station of the network, it sends a datagram to the MAC address FF-FF-FF-FF-FF-FF (a broadcast), which is an address to which the network interface card (NIC) of every host must listen to. Routers, operating at Layer 3 of the OSI model, typically do not forward such broadcasts. They limit them to the segment they originated from. When a host needs to communicate with part of the network, it sends a datagram to ...

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