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VXLAN, NSX Controllers, and NSX Preparation

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Elver Sena Sosa introduces VXLAN, one of the control planes of NSX, NSX Controllers, and how to prepare the vSphere environment for NSX.

This chapter is from the book

Deploying NSX Manager and attaching it to vCenter are the first steps in allowing you to deploy your software defined network. Your goal is to have logical switches, distributed logical routers, and create and enforce security policies with the distributed firewall and service composer.

Before you can reach your goal, you need to deploy our NSX Controllers and tell NSX Manager which ESXi hosts will be part of the NSX domain. The steps to tell NSX Manager which ESXi hosts will be part of the NSX Domain are

  • Install NSX modules.

  • Configure VXLAN networking in each ESXi host.

  • Create VNI pools.

  • Create transport zones.

This chapter covers all the steps needed to prepare your NSX domain. The chapter begins with a proper introduction of what VXLAN is.

Do I Know This Already?

The “Do I Know This Already?” quiz allows you to assess whether you should read this entire chapter or simply jump to the “Exam Preparation Tasks” section for review. If you are in doubt, read the entire chapter. Table 4-1 outlines the major headings in this chapter and the corresponding “Do I Know This Already?” quiz questions. You can find the answers in Appendix A, “Answers to the ‘Do I Know This Already?’ Quizzes.”

Table 4-1 Headings and Questions

Foundation Topic Section

Questions Covered in This Section



NSX Controllers


IP Pools


Host Preparation


Host Configuration


VNI Pools, Multicast Pools, and Transport Zones


  1. What is the source Layer 4 port number of a VXLAN frame?

    1. It is statically configured to TCP 8472.

    2. It is statically configured to UDP 8472.

    3. It is randomly generated by the VTEP.

    4. It is derived from the encapsulated frame.

  2. At least how many bytes does the VXLAN encapsulation add to the encapsulated frame?

    1. 50

    2. 100

    3. 1500

    4. 9000

  3. How many NSX universal controllers are required to be deployed in a production NSX environment?

    1. 1

    2. 2

    3. 3

    4. 4

  4. What NSX entity is responsible for slicing the distributed logical router?

    1. The NSX Manager

    2. The distributed router control virtual machine

    3. The API provider NSX Controller Master

    4. The Layer 3 NSX Controller Master

  5. What are two use cases of IP pools by NSX Manager? (Choose two.)

    1. To assign IPs to virtual machines in the virtual network.

    2. To assign the default gateway for VTEPs.

    3. To assign IPs to NSX Manager.

    4. To assign IPs to NSX Controllers.

  6. Which of the following is an action that takes place during host preparation?

    1. The NSX Manager tells vCenter to add the selected hosts in the NSX host clusters.

    2. The NSX Manager installs NSX modules on the ESXi hosts.

    3. vCenter adds the VXLAN VMkernel port to the ESXi hosts.

    4. The NSX Controller Master uploads the NSX configuration data to the ESXi hosts.

  7. Which NSX feature does not require logical networking preparation to be completed before it can be used?

    1. VXLAN

    2. Logical switches

    3. Distributed firewall

    4. Distributed logical routers

  8. How many vDS switches does NSX Manager support in a single host cluster?

    1. 1

    2. 2

    3. 32

    4. 128

  9. During host configuration you select a VMKNic teaming policy of enhanced LACP. How many VTEPs does NSX Manager create per ESXi host?

    1. 1

    2. 2

    3. As many dvUplinks as are configured on the vDS

    4. As many VMNICs as are installed on the ESXi hosts

  10. How many universal transport zones are supported in a cross vCenter NSX domain?

    1. 1

    2. 1 per NSX Manager in the cross vCenter NSX domain

    3. Up to the number of VNIs in the segment ID pool

    4. 1 per NSX universal controller

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