# Infrastructure Virtualization - 6

1. Following are applicable to virtual switching in general,
 >virtual switch is a software program that enables one VM to communicate with another. Also establish connections between virtual and physical networks.
 >![image.png](https://cdn.hashnode.com/res/hashnode/image/upload/v1656183175427/d2mNh2B-y.png align="left")

 - Responsible for virtual machine Layer 2 connectivity
 - Can be configured per host, without use of a VM manager
 - Supports LACP(Link aggregation control protocol)
 - Can belong to more than one host
 - _Allow live migration of VM_

2. Differences between VMware vNetwork Standard Switch and VMware vNetwork Distributed Switch (vDS or distributed virtual switch i.e DVS)?
 >![image.png](https://cdn.hashnode.com/res/hashnode/image/upload/v1656177829337/pdaBKexmL.png align="left")

 - VMware vCenter requirement
 - Uplink Port Groups
 - Resides in more than one host
 - Supports LACP(Link aggregation control protocol)

3. Following virtual devices can be considered distributed virtual switches,
 - Open vSwitch
 - VMware vDS
 - Cisco Nexus 1000V

4. Facts about Cisco Nexus 1000V Switch for VMware vSphere
 - Cisco Nexus 1000V can coexist with other virtual switches in the same host
 - The communication between VSM (Virtual Supervisor Module) and VEM (Virtual Ethernet Module) requires Layer 3 connectivity
 - The VEM runs inside the VMware vSphere kernel
 - The communication between active and standby VSMs requires Layer 2 connectivity

5. Correct associations of Cisco Nexus 1000V interfaces and VMware vSphere interfaces,
 - vEthernet and vmk
 - Ethernet and vmnic (vm network interface controller)

6. Cisco Nexus 1000V features
 >![image.png](https://cdn.hashnode.com/res/hashnode/image/upload/v1656183270380/jzX7xlHsx.png align="left")

 - vTracker
 - PortChannel
 - Private VLAN
 - TrustSec

7. Hypervisors that support Cisco Nexus 1000V,
 - VMware vSphere
 - KVM
 - Microsoft Hyper-V for Windows 2012

8. Protocols used in VXLAN (Virtual eXtensible LANs) encapsulation header,
 - UDP
 - IP

9. Advantages of VXLANs over VLANs,
 - Avoid MAC address table overflow in physical switches
 - Offers easier provisioning of broadcast domains for virtual machines
 - Provides more segment (are assigned to the range 4096 to 16,777,215)
 >![image.png](https://cdn.hashnode.com/res/hashnode/image/upload/v1656183351129/9eCQ0BEZr.png align="left")
 >![image.png](https://cdn.hashnode.com/res/hashnode/image/upload/v1656183381749/QQ-p0sI3W.png align="left")

10. Improvements of Cisco Nexus 1000V Enhanced VXLAN over standard VXLAN deployments,
 - Does not require IP multicast
 - Eliminates flooding