chapter 8.pdf - Chapter 8 Subnetting IP Network Broadcast...

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1 Chapter 8 Subnetting IP Network Broadcast DomainsIn an Ethernet LAN, devices use broadcasts to locate: Other devicesA device uses Address Resolution Protocol (ARP) which sends Layer 2 broadcasts to a known IPv4 address on the local network to discover the associated MAC address. Services A host typically acquires its IPv4 address configuration using the Dynamic Host Configuration Protocol (DHCP) which sends broadcasts on the local network to locate a DHCP server. Routers do not propagate broadcasts. When a router receives a broadcast, it does not forward it out other interfaces. Problems with Large Broadcast DomainsA large broadcast domain is a network that connects many hosts. Slow network operations due to the significant amount of traffic it can cause Slow device operations because a device must accept and process each broadcast packet The solution is to reduce the size of the network to create smaller broadcast domains in a process called subnetting

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