Exam AZ-300 topic 1 question 18 discussion

I think it's C, D, & E because the answer cannot be A as a vertical scale change would require a restart of the VM thus violating the requirement of "must not experience any downtime". The answer cannot be B as an availability set is more of an HA solution than a scaling solution.

I think C,D,E because availability set - the application must "application must not experience any downtime " but a scale set automatically implements placement groups which work in a similar way to availability sets using fault and update zones. MS docs never recommend using scale sets and availability sets together and I dont even think it is possible? D & E because horizontal scaling means increasing the number of instances as opposed to vertical scaling which increases the instances resources.You can use metrics from application insights to trigger scaling. I didnt think both D and E were correct , but seeing that A and B are not correct then I must choose E aswell

CDE, I think the key here is "implement an auto scaling strategy" I do not believe the same VM can be in both an availability and scale set.

C,D,E(A: Vertical scaling is add memory,cpu ram can we do it on vm in runtime,so answer is no.B:No such concept.).

Each correct answer presents a complete solution so A D E

You can create custom, or user-defined, routes in Azure to override Azure's default system routes, or to add additional routes to a subnet's route table. You can specify the following next hop types when creating a user-defined route: Virtual appliance: A virtual appliance is a virtual machine that typically runs a network application, such as a firewall. Virtual network gateway: Specify when you want traffic destined for specific address prefixes routed to a virtual network gateway. The virtual network gateway must be created with type VPN. You cannot specify a virtual network gateway created as type ExpressRoute in a user-defined route because with ExpressRoute, you must use BGP for custom routes. A & D are correct

CDE are the correct answers

C. Create a VM scale set. D. Deploy application automatic horizontal scaling. E. Deploy a custom auto-scale implementation.

CDE are the correct answers

Scale Set is for Auto Scaling strategy C D E

First of all, you CANNOT use Availability Set (B) and Scale Set (C) combined. It's either one or the other. Second, the questions mentions auto scale, and Scale Sets are implicit Availability Sets. I like this explanation: "A typical architecture might use a scale set for agent or worker nodes, and an availability set for master or control nodes." Answer must be C, D and E. https://stackoverflow.com/questions/38112816/difference-in-azure-availability-sets-and-scale-sets

You can not create scaleset from this VM, you can use its image to create a new VM scale set. Options are not perfect as per answer but since A and B are totally wrong so only remaining options are C,D and E.

Virtual machines in a scale set can be deployed across multiple update domains and fault domains to maximize availability and resilience to outages due to data center outages, and planned or unplanned maintenance events. Answer. BCD

Answer should be BCD ..As it requires Autoscaling .

CDE, Virtual scaling requires a reboot (requirement says no downtime), Availability sets are for HA not scaling. So we need VMSS, Horizontal scaling, and a custom implementation to increase.decrease by one or more VMs.

i would say answer is BCD to meet high availabilty and auto scale requirements https://docs.microsoft.com/en-us/azure/virtual-machine-scale-sets/virtual-machine-scale-sets-use-availability-zones

A&B Cannot be the answers hence C, D, E are correct. Vertical scaling means adding more cpu. disk etc and availability set are to protect against HW failure of underlying hosts.