XenServer networking isn't that much different from VMware as it also features methods to connect virtual machines to external networks, internal networks, and VLAN networks. Virtual machines have virtual network interface cards or adapters connected to networks using virtual NICs. Virtual NICs connect to vSwitches inside XenServer that connect to other virtual networks and external physical networks.
Virtual networking in XenServer is not that much different than networking in the physical realm. You assign virtual interfaces to a virtual machine and configure them with both an IP address and a MAC address–although, a MAC is assigned by default. The internal vSwitch networks your virtual machines and allows them to connect to external physical switches through the physical Ethernet adapter.
The sequence of configuring networking on XenServer is important and should match on all XenServer hosts to maintain ease of manageability. Networking is also a XenServer Pool function...