I gather in this blog post different networking definitions a network engineer may encounter (or may not, what a shame, LOL) in his journey. It will be a short article but bare with me, there are tricky nuances!
|Layer 2 domain||the network formed by the sum total of switches, hubs and any layer 2 devices in a network. The layer 2 domain is delimited by the existence of a device performing a layer 3 (routing) function.|
|Administrative layer 2 domain||the layer 2 domain – or part thereof – that a network engineer manages.|
|L2 segment||a portion of the layer 2 domain. It is usually defined by either VLAN or VXLAN technology.|
|VLAN segment||the collection of network hosts and nodes that belong to the same VLAN ID. Hosts on one VLAN segment “A” can not communicate inherently with hosts on a VLAN segment “B” unless there is a routing component (a layer 3 gateway) that performs inter-VLAN routing.|
|Multitenant datacenter||a datacenter where multiple organisations, or departments within an organisation, share the resources of the same datacenter infrastructure network.|
|Workload||a logical block that consumes datacenter resources: compute, storage and network.|
|BUM traffic||Layer 2 Broadcast traffic +Unknown Unicast traffic (which is also a broadcast traffic type) + layer 2 Multicast traffic.|
|Unknown Multicast traffic||a multicast traffic that matches no entry in the multicast table.|
|Config/fault domain||the area of the network that is impacted by a configuration policy or a fault.|
|Live Migration||a software-defined datacenter feature offered by Microsoft. It is moving a compute workload from a virtualization server/cluster to another one, without powering off the workload.|
Vmware has a similar feature called vMotion.