Is a VLAN and subnet the same thing?
At a high level, subnets and VLANs are analogous in that they both deal with segmenting or partitioning a portion of the network. However, VLANs are data link layer (OSI layer 2) constructs, while subnets are network layer (OSI layer 3) IP constructs, and they address (no pun intended) different issues on a network.
What is the difference between a broadcast domain and a subnet?
Broadcast domain usually refers to the “layer 2” (e.g. Ethernet) segment, on which all nodes can broadcast to each other. Subnetwork usually refers to the logical division of “layer 3” (e.g. IP) network that is a sub-segment of a larger network.
Does each subnet need its own router?
You don’t need a router. If you set the subnet mask on all of the PCs to be 255.255. 0.0, then they should all be able to ping each other. Basically, opening up the subnet mask puts all of the PCs on the same subnet, so a router isn’t needed.
Which is a subnet or a broadcast domain?
A subnet is a broadcast domain. More specifically, by default, a router will not forward a Layer 3 broadcast outisde the subnet. That’s why, for example, when you create a user VLAN on a layer 3 switch and the DHCP server does NOT reside in the local VLAN, a “helper address” must be configured for that user VLAN.
What’s the difference between a VLAN and a subnet?
At a high level, subnets and VLANs are analogous in that they both deal with segmenting or partitioning a portion of the network. However, VLANs are data link layer (OSI layer 2) constructs, while subnets are network layer (OSI layer 3) IP constructs, and they address (no pun intended) different issues on a network.
How are VLANs used to create layer 3 networks?
Without VLANs, a switch considers all devices on the switch to be in the same broadcast domain, so VLANs can essentially create multiple layer 3 networks on a single physical infrastructure. For example, if a DHCP server is plugged into a switch it will serve any host on that switch that is configured for DHCP.
What’s the difference between a VLAN and a switch?
Quality of Service schemes can optimize traffic on VLANs for real-time (VoIP) or low-latency requirements (SAN). Without VLANs, a switch considers all devices on the switch to be in the same broadcast domain, so VLANs can essentially create multiple layer 3 networks on a single physical infrastructure.