Which command is used to display the network configuration of the Tunnel Endpoint (TEP) IP on a bare metal transport node?
ifconfig ens192
The output of the command would look something like this:
ens192: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 10.10.10.10 netmask 255.255.255.0 broadcast 10.10.10.255 inet6 fe80::250:56ff:fe9a:1b8c prefixlen 64 scopeid 0x20<link> ether 00:50:56:9a:1b:8c txqueuelen 1000 (Ethernet) RX packets 123456 bytes 123456789 (123.4 MB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 234567 bytes 234567890 (234.5 MB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
The TEP IP in this example is10.10.10.10.
An NSX administrator would like to create an L2 segment with the following requirements:
* L2 domain should not exist on the physical switches.
* East/West communication must be maximized as much as possible.
Which type of segment must the administrator choose?
An overlay segment is a layer 2 broadcast domain that is implemented as a logical construct in the NSX-T Data Center software. Overlay segments do not require any configuration on the physical switches, and they allow for optimal east/west communication between workloads on different ESXi hosts. Overlay segments use the Geneve protocol to encapsulate and decapsulate traffic between the hosts. Overlay segments are created and managed by the NSX Manager.
Which table on an ESXi host is used to determine the location of a particular workload for a frame-forwarding decision?
The MAC table on an ESXi host is used to determine the location of a particular workload for a frame-forwarding decision. The MAC table maps the MAC addresses of the workloads to their corresponding tunnel endpoint (TEP) IP addresses. The TEP IP address identifies the ESXi host where the workload resides. The MAC table is populated by learning the source MAC addresses of the incoming frames from the workloads. The MAC table is also synchronized with other ESXi hosts in the same transport zone by using the NSX Controller.
https://nsx.techzone.vmware.com/resource/nsx-reference-design-guide
An NSX administrator is using ping to check connectivity between VM1 running on ESXi1 to VM2 running on ESXi2. The ping tests fails. The administrator knows the maximum transmission unit size on the physical switch is 1600.
Which command does the administrator use to check the VMware kernel ports for tunnel end point communication?
The commandvmkping ++netstack=geneve -d -s 1572 <destination IP address>is used to check the VMware kernel ports for tunnel end point communication. This command uses the geneve netstack, which is the default netstack for NSX-T. The-doption sets the DF (Don't Fragment) bit in the IP header, which prevents the packet from being fragmented by intermediate routers. The-s 1572option sets the packet size to 1572 bytes, which is the maximum payload size for a geneve encapsulated packet with an MTU of 1600 bytes. The<destination IP address>is the IP address of the remote ESXi host or VM.Reference: : VMware NSX-T Data Center Installation Guide, page 19. : VMware Knowledge Base: Testing MTU with the vmkping command (1003728). : VMware NSX-T Data Center Administration Guide, page 102.
A customer is preparing to deploy a VMware Kubernetes solution in an NSX environment.
What is the minimum MTU size for the UPLINK profile?
The minimum MTU size for the UPLINK profile is 1700 bytes. This is because the UPLINK profile is used to configure the physical NICs that connect to the NSX-T overlay network. The overlay network uses geneve encapsulation, which adds an overhead of 54 bytes to the original packet. Therefore, to support a standard MTU of 1500 bytes for the inner packet, the outer packet must have an MTU of at least 1554 bytes. However, VMware recommends adding an extra buffer of 146 bytes to account for possible additional headers or VLAN tags. Therefore, the minimum MTU size for the UPLINK profile is 1700 bytes (1554 + 146).Reference: : VMware NSX-T Data Center Installation Guide, page 23. : VMware NSX-T Data Center Administration Guide, page 102. : VMware NSX-T Data Center Installation Guide, page 24.
https://nsx.techzone.vmware.com/resource/nsx-reference-design-guide#a-31-the-nsx-virtual-switch
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