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What is a Layer 2 broadcast domain?
A broadcast domain is a logical division of a network in which all nodes of that network can be reached at Layer 2 by a broadcast. Segments of a LAN can be linked at the frame level using bridges. On a VLAN, a frame whose origin and destination are in the same VLAN are forwarded only within the local VLAN.
How many broadcast domains does a Layer 2 switch have?
1 broadcast domain
Answer is B. The switch creates 12 collision domains and 1 broadcast domain. A switch creates a single broadcast domain, not separate broadcast domains so any answer with 12 broadcast domains is incorrect. A switch creates separate collision domains for each port, not a single collision domain for the entire switch.
Do VLANs separate collision domains?
VLAN’s break up collisions domains for each port on the switch.
Why do we have four broadcast domains in the LAN?
Only routers separate the LAN into multiple broadcast domains. That is why we have four broadcast domains in the network pictured above. Ethernet broadcasts are usually used by Address Resolution Protocol (ARP) to translate IP addresses to MAC addresses.
Which is the boundary of the Layer 2 domain?
The access and distribution layers form the boundary for the Layer 2 domain of the building block network. This is an area where the Spanning Tree Protocol (STP) plays a critical role. Unfortunately, a common perception of STP is that it is a dated technology and has always been blamed for network disruptions.
Why do I need a broadcast domain on my router?
Broadcasts sent by a device in one broadcast domain are not forwarded to devices in another broadcast domain. This improves the performance of the network because not all devices on a network will receive and process broadcasts. Routers separate a LAN into multiple broadcast domains (every port on a router is in a different broadcast domain).
How is a broadcast domain connected to a VLAN?
Broadcast domains are now logical entities connected by “virtual bridges” in the device. Each virtual bridge configured in the LAN switch establishes a distinct broadcast domain, or VLAN. Frames from one VLAN cannot pass directly to another VLAN on the LAN switch (or else you create one big VLAN or broadcast domain).