Exam 3V0-21.21 topic 1 question 21 discussion

OK, changing my answer AGAIN after reading A & D - Best to use https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.networking.doc/GUID-84207BEA-986E-443E-94B0-B1EC66C56598.html Assign priority tags to traffic, such as VoIP and streaming video, that has higher networking requirements for bandwidth, low latency, and so on. You can mark the traffic with a CoS tag in Layer 2 of the network protocol stack or with a DSCP tag in Layer 3.

AD - Assign priority tags to traffic, such as VoIP and streaming video, that has higher networking requirements for bandwidth, low latency, and so on. You can mark the traffic with a CoS tag in Layer 2 of the network protocol stack or with a DSCP tag in Layer 3. - Priority tagging is a mechanism to mark traffic that has higher QoS demands. In this way, the network can recognize different classes of traffic. The network devices can handle the traffic from each class according to its priority and requirements. - You can also re-tag traffic to either raise or lower the importance of the flow. By using a low QoS tag, you can restrict data tagged in a guest operating system. https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.networking.doc/GUID-84207BEA-986E-443E-94B0-B1EC66C56598.html

B >> Adding a new NIC in hosts won’t help, as the TOR switches are full C >> The TOR switches are 10 Gbps. Replacing the NICs with 25Gbps adapters won’t help. E >> Same problem as in B : no more place on the TOR switches

AD A. Enable and tag traffic on the backup distributed port group (is the way to optimize the network infrastructure) B. Add a new two-port 10 GbE NIC per ESXi host (there is no free ports in the TOR to connect them) C. Replace the existing NIC with a two-port 25 GbE NIC per ESXi host (Port in the TOR are 10 GbE) D. Match the Class of Service (CoS) and Differentiated Services Code Point (DSCP) values to the physical network E. Create a new virtual switch using the 1 GbE uplinks (There is no free ports in TOR to connect it) So A and D are the only answers that make sense.

Only AD makes sense

B- false = TOR is fully populated C- false= we cannot change a 4 port 10GB with a 2 port 25Gb this is will impact network config E- false

This is about elimination of answers.. B is not because we cant add ports. We dont have available ports on the ToR switches C. same E. same. We dont have 1GbE switch at all

Question is poorly worded. "All top-of-rack (ToR) switches are 10 GbE and fully populated" so are we assuming the 2 x 1GbE NICs mentioned are connected to these via backwards compatibility with 10G copper? Or that they can't be used at all(constraint)? As this is ambiguous im ruling out E and going with A&D

I think it's probably D&E D. Match the Class of Service (CoS) and Differentiated Services Code Point (DSCP) values to the physical network Class of Service (CoS) or Quality of Service (QoS) is a way to manage multiple traffic profiles over a network by giving certain types of traffic priority over others. For example you can give Voice traffic priority over email or http traffic. CoS is offered by service providers normally within an MPLS (Multi Protocol Label Switching) offering. Differentiated Services Code Point (DSCP) is a means of classifying and managing network traffic and of providing quality of service (QoS) in modern Layer 3 IP networks. It uses the 6-bit Differentiated Services (DS) field in the IP header for the purpose of packet classification. E. Create a new virtual switch using the 1 GbE uplinks Dedicate the 2x1GB NICS on the new vSwitch

A&E. A. Enable and tag traffic on the backup distributed port group YES B. Add a new two-port 10 GbE NIC per ESXi host They already have hardware. C. Replace the existing NIC with a two-port 25 GbE NIC per ESXi host They already have hardware. D. Match the Class of Service (CoS) and Differentiated Services Code Point (DSCP) values to the physical network NO E. Create a new virtual switch using the 1 GbE uplinks YES

I think A & E

I would say A and D??

I don't get it. The ToR are fully populated