Question : You have deployed two tier application, in this web server in public subnet and db server in private subnet. You have also created a NAT instance in public subnet and attached an EIP to that NAT instance and added route for that. Now, all the instances in private subnet need to download OS patch from internet and will access internet via NAT instances. However, after entire configuration they are still not able to reach internet. What could be the possible reason?
1. Keep the NAT instance in the same private subnet. So that instances from private subnet can reach NAT instances. And NAT instances can send back traffic to instances in private subnet.
2. Instances in private subnet can never access the internet. They have to be in public subnet.
4. You would have to complete one more step on NAT instance, disable source/destination check on the NAT instance.
Correct Answer : Get Lastest Questions and Answer : Explanation: It is mandatory that you disable the source and destination check on the NAT instances. So that they can reach internet, without checking what is the source and destination. NAT will do the IP translation from public/EIP to private IP when traffic is returned.
Question : You are building an automated transcription service in which Amazon EC worker instances process an uploaded audio file and generate a text file. You must store both of these files in the same durable storage until the text file is retrieved. You do not know what the storage capacity requirements are. Which storage option is both cost-efficient and scalable? 1. Multiple Amazon EBS volume with snapshots 2. A single Amazon Glacier vault 3. Access Mostly Uused Products by 50000+ Subscribers 4. Multiple instance stores
Ans : 3
Question : You want to install, your own custom database on EC. So that you can migrate your in-house MySQL db. On that EC instance. Now, you have also attached an EIP and Elastic Block store to that instance. After installing required software, it is recommended to stop and start the instance again. You have some license versioned data on instance store as well. Because of this, how your entire configuration will be impacted?
A. EIP of the instance will be detached and you have to attach it again, after restart and it could be different one. B. All the data which is on instance store will be lost. C. You have to attach EBS back to the instance after re-start D. Underlying host of EC2 instance would be changed E. You have to re-create all the Security Group and NACL, previously you created for this instance.
Correct Answer : Get Lastest Questions and Answer : Explanation: When you stop and start the instance following will happen. - Any data stored in instance store will be lost. - Data stored in EBS will not be impacted, even that will remain attached with the instance. - There will be no impact on security group and NACL - Yes, underlying host will be changed.
Question : In the event of a planned or unplanned outage of your primary DB instance, Amazon RDS automatically switches to a standby replica in another Availability Zone if you have enabled__________
In the event of a planned or unplanned outage of your primary DB instance, Amazon RDS automatically switches to a standby replica in another Availability Zone if you have enabled Multi-AZ. The automatic failover mechanism simply changes the canonical name record (CNAME) of the main DB instance to point to the standby DB instance. Note that high availability does not mean that Amazon keeps, for example, two databases running in parallel; it is the data on disk that is replicated. If the primary DB instance becomes unavailable, a failover begins and the database software is started on the standby replica. The time it takes for the failover to complete depends on the database activity and other conditions at the time the primary DB instance became unavailable. When the failover is complete, it can take additional time for the RDS console UI to reflect the new Availability Zone.
Amazon RDS handles failovers automatically so you can resume database operations as quickly as possible without administrative intervention. The primary DB instance switches over automatically to the standby replica if any of the following conditions occur:
An Availability Zone outage The primary DB instance fails The DB instances server type is changed The DB instance is undergoing software patching
1. The use of some AWS CloudFormation resources and templates will require you to specify an Amazon EC2 key pair for authentication. 2. The use of any AWS CloudFormation resources and templates do not require you to specify an Amazon EC2 key pair for authentication. 3. Access Mostly Uused Products by 50000+ Subscribers 4. The use of any AWS CloudFormation resources and templates do not require you to specify a root account.