An IT firm uses Hybrid Connectivity by deploying most of their servers in AWS VPC while retaining some of their IT infrastructure at the on-premises location. Users access the data from servers hosted on EC2 instance in AWS VPC. The IT team has categorized IT services into 3 different groups; critical, normal & best efforts. To enhance user performance for accessing data over the cloud, the IT Head wants you as a Network Engineer to mark this traffic end to end between on-premises to AWS servers hosted on EC2 instance. This should allocate guaranteed bandwidth to end-users accessing critical services over users accessing normal services& the least bandwidth should be allocated to best effort IT service. Which of the following can be deployed to meet this requirement?

Answer options:

A.Use QOS Marking on applications & request the service provider to honor these markings on AWS Direct Connect links towards AWS.
B.Use QOS Marking on applications & send all user traffic over hardware VPN links terminating on VGW.
C.Use QOS Marking on applications & send over AWS Direct Connect links terminating on VGW.
D.Use QOS Marking on applications & use QOS supporting Software VPN to terminate VPN on EC2 instance & prioritize traffic in EC2 OS level.

Correct Answer – D
VGW does not support application QOS markings. To support QOS, Software VPN can be used to terminate an EC2 instance. This EC2 instance using any VPN software supports traffic prioritization while traffic sending traffic out to the AWS network. Within AWS networks, QOS marking is not supported, but return traffic has QOS marking based on which traffic can be prioritized.
Option A is incorrect as this will partially meet the requirement. This will prioritize traffic only on Service provider links & not in AWS, as VGW does not support QOS markings.
Options B & C are incorrect as VGW does not support QOS markings.
 For more information on using QOS, refer to the following URLs
https://www.watchguard.com/help/docs/help-center/en-US/Content/en-US/Fireware/qos_trafficmanagement/qos_markings_about_c.html