Issue with answer in question

[Zalo]

in the timed mode section (Q2) I see a discrepancy in the explanation of the answers of the following question:

2. QUESTION

A multinational bank has a hybrid cloud system in AWS using a 10 Gbps AWS Direct Connect (DX) dedicated connection. The Direct Connect connection is configured with a link aggregation group (LAG) bundle and a MAC Security Standard (MACsec) encryption which connects to all five Amazon VPCs in the ap-southeast-2 region. Each division has its own VPC and private VIF for on-premises connectivity. However, there are reports of lag and stability issues when accessing the AWS-hosted resources.

Upon investigation, a network engineer found out that there was an abrupt surge in throughput lasting for an hour each day every 3 PM, which saturates the Direct Connect (DX) connection during work days. The network engineer must find out what business unit is causing the surge to report to the company and implement a solution.

Which of the following provides the MOST operationally-efficient solution to resolve this problem?

To address the issue during high throughput, analyze the Virtual Interface metrics. Identify the VIF with the highest throughput to pinpoint the responsible division’s VPC. To change the port speed, you must create and configure a new connection. You can’t change the port speed after you create the connection request for a Direct Connect dedicated connection.

Hence, the correct answer is: Check the Amazon CloudWatch metrics for VirtualInterfacePpsEgress and VirtualInterfacePpsIngress to verify which VIF sent the highest throughput when lag happened. Provision a new 100 Gpbs dedicated connection. Transfer the traffic to the new dedicated connection from the existing dedicated connection.

The option that says: Check the Amazon CloudWatch metrics for VirtualInterfaceBpsEgress and VirtualInterfaceBpsIngress to verify which VIF sent the highest throughput when lag happened. Change the bandwidth of the existing dedicated connection to 100 Gbps for a faster connection is incorrect. It is true that VirtualInterfacePpsEgress and VirtualInterfacePpsIngress can help identify which specific VIF or business unit is generating a high number of incoming and outgoing packets during the period of increased throughput; however, changing the bandwidth for an existing Direct Connect (DX) dedicated connection is not possible. This action is only permitted for hosted connection by reaching out to AWS Direct Connect Partner who manages your hosted connection.

The option that says: Check the Amazon CloudWatch metrics for ConnectionPpsIngress and ConnectionPpsEgress to verify which VIF sent the highest throughput when lag happened. Provision a new 100 Gpbs dedicated connection. Transfer the traffic to the new dedicated connection from the existing dedicated connection is incorrect. Even though transferring the traffic to the new dedicated connection from the existing dedicated connection can solve the problem, the network engineer can’t know the VIF causing the surge of throughput as ConnectionBpsIngress and ConnectionBpsEgress simply aggregate the incoming and outgoing traffic across all VIFs. It cannot pinpoint the specific VIF causing the surge of throughput.

The option that says: Check the Amazon CloudWatch metrics for ConnectionBpsIngress and ConnectionBpsEgress to verify which VIF sent the highest throughput when lag happened. Change the bandwidth of the existing dedicated connection to 100 Gbps for a faster connection is incorrect. Although the ConnectionPpsIngress and ConnectionPpsEgress metrics are useful for monitoring overall traffic utilization of the Direct Connect connection, it does not provide the necessary granularity to identify the specific VIF or business unit causing the surge in throughput.

PPS and BPS are mixed up in the explanation.

[Tutorials-Dojo]

Thank you, Zalo, for bringing this to our attention.

We have updated this item, and the changes will be reflected in our content soon.

Let us know if you need further assistance. The Tutorials Dojo team is dedicated to helping you pass your AWS exam on your first try!

Regards,

Jon Bonso @ Tutorials Dojo