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The future of networking is virtual. Keep your skills relevant and future-proof your career by earning yourVMware Certified Professional – Network Virtualization (VCP-NV) certification for half price through June 30, 2015.

Plus, if you have certain Cisco certification*, we will waive the course requirement in recognition of your previous certification through January 31, 2016. Visit the VCP-NV certification requirements page for complete details.

Whether you are earning your first VMware certification or seeking recertification this is a terrific opportunity to discover cutting-edge NSX technology and save on your exam.

Certification	Exam Code	Discount Code
VCP-NV	VCPN610	VCPNV50

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* Valid CCNA Data Center, CCNA Routing & Switching, CCNP Data Center, CCNP Routing & Switching, CCIE Data Center, or CCIE Routing & Switching certification can be applied towards VCP-NV certification. See the certification program page for complete details.

The virtual NIC type remains as flexible even after installing VMware Tools or upgrading Virtual Hardware version (2108662)

Purpose

To provide an explanation to why a virtual NIC of a virtual machine remains as flexible even after installing VMware Tools or upgrading the Virtual Hardware version.

Resolution

Modern Guest Operating Systems such as Windows 2008 does not support this type of adapter and does not provide an option to select flexible when creating a virtual machine. Although legacy Operating System such as Windows 2003 still provides this option, this type of virtual NIC should only be used as a placeholder until you decide which vNIC will need to be configured for the virtual machine.

For more information, see Choosing a network adapter for your virtual machine (1001805).

Converting from flexible to VMXNET is an automated process during a VMware Tools installation following a reboot of the virtual machine.

To confirm that the virtual NIC has changed from flexible to another type:

1. Log in to the Windows Guest OS with no VMware Tools installed.
2. Open a command prompt and run command to display the adapter configuration.
   
   ipconfig /all
   
   Note: Notice the Adapter type is AMD PCNET Family PCI Ethernet adapter.
   
3. Install VMware tools.
4. Once installation completes, reboot the virtual machine.
5. Log back in to the Windows Guest OS and re-open the command prompt.
6. Re-run command:
   
   ipconfig /all
   
   Note: Notice the Adapter type is now VMware Accelerated AMD PCnet adapter.

If you choose to use VMXNET2 or VMXNET3, delete the existing virtual NIC of the virtual machine. Then add a new virtual NIC and configure with the desired type such as VMXNET2 or VMXNET3.

Source KB:-

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2108662#sf36549405&src=vmw_so_vex_ragga_1012

DEM's vs Agents in vCAC

The original functionality was all based on agents, the agent was installed to do one thing, and it could only do one thing. It connects to the manager service via SOAP, and requires installing a dedicated agent for a particular type of endpoint. The DEM communicates with the web server via REST, it does not maintain a personality like an agent, but pulls down the required workflows at runtime. This allows you to update a given workflow one time centrally, and all the DEM's will run that new version next time they execute it.

There was an architectural decision after the DEM was introduced, that new functionality would be written into the DEM type platform and originally DynamicOps was talking about moving the agent functionality into the DEMs (never happened). So you will see things like Amazon EC2, physical provisioning, calling vRO, etc. are executed by the DEM Workers, but the original core functionality of the product (vSphere, Hyper-V, etc) have associated agents that execute that work.

DEMs are used for provisioning and managing machines on:

1.       VMware® vCloud Director® and VMware vCloud® Hybrid Service™ 

2.       Red Hat Enterprise Virtualization (RHEV) Manager

3.       Microsoft System Center Virtual Machine Manager (SCVMM)

4.       Amazon Web Services

5.       Physical Server Management Interfaces for Dell, HP, and Cisco

Agents are used for provisioning and managing machines and services on:

1.       Hypervisor proxy agents (VMware vSphere®, Citrix, XenServer, Hyper-V)

2.       External provisioning infrastructure (EPI)

3.       Virtual Desktop Infrastructures (VDIs)

4.       Windows Management Instrumentation (WMI)

The DEM can be installed as either a DEM Orchestrator or a DEM Worker. At least one DEM instance must be present for each role.  Additional instances can be added for scalability and availability.

The DEM Orchestrator provides the following functions:

a.       Monitors and manages the DEM Worker status:

                                                   i.      If a DEM Worker fails, the DEM Orchestrator shifts the workflow to another DEM Worker instance.

b.      Schedules workflows

c.       Generates workflow history for reporting

  

DEM Workers communicate with the external systems to execute workflows.