You nave multiple Amazon EC2 instances running in a cluster across multiple Availability Zones within the same
region. What combination of the following should be used to ensure the highest network performance
(packets per second), lowest latency, and lowest jitter? Choose 3 answers
A.
Amazon EC2 placement groups
B.
Enhanced networking
C.
Amazon PV AMI
D.
Amazon HVM AMI
E.
Amazon Linux
F.
Amazon VPC
A B D
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E is wrong
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A B D
D is correct – http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/virtualization_types.html
The main difference between PV and HVM AMIs is the way in which they boot and whether they can take advantage of special hardware extensions (CPU, network, and storage) for better performance.
For the best performance, we recommend that you use current generation instance types and HVM AMIs when you launch your instances.
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E is correct. The latest Amazon Linux HVM AMIs have the module required for enhanced networking installed and have the required attribute set.
Answer BDE
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The answer is BDF.
See https://aws.amazon.com/ec2/faqs/
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why F, not E? HVM AMI apply to Linux only.
I agree with Anto it’s BDE as Placement Group doesn’t support across AZs.
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The answer is “placement groups” plural. You can have a placement group in each AZ.
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The answer is A,B,D
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http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/enhanced-networking.html
The answer is A,B,D
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A,B,D.
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question always stress that “running in a cluster across multiple Availability Zones” so I doubt whether placement group can be again created in each AZ
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BDF is correct . A is wrong bcz :A placement group is a logical grouping of instances within a single Availability Zone.It cant spane across multiple AZ.
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If you select B then E goes hand in hand. BDE
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Would say
BDF
Enhanced Networking
Enhanced Networking enables you to get significantly higher packet per second (PPS) performance, lower network jitter and lower latencies. This feature uses a new network virtualization stack that provides higher I/O performance and lower CPU utilization compared to traditional implementations. In order to take advantage of Enhanced Networking, you should launch an HVM AMI in VPC, and install the appropriate driver. For instructions on how to enable Enhanced Networking on EC2 instances, see the Enhanced Networking on Linux and Enhanced Networking on Windows tutorials. For availability of this feature by instance, or to learn more, visit the Enhanced Networking FAQ section.
https://aws.amazon.com/ec2/details/
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B, D, E
In order to enable this feature, you must launch an HVM AMI with the appropriate drivers.
X1 instances provide the Elastic Network Adapter (ENA) interface (which uses the “ena” Linux driver) for Enhanced Networking.
C3, C4, R3, I2, M4 and D2 instances use Intel® 82599g Virtual Function Interface (which uses the “ixgbevf” Linux driver).
Amazon Linux AMI includes both of these drivers by default.
For AMIs that do not contain these drivers, you will need to download and install the appropriate drivers based on the instance types you plan to use.
You can use Linux or Windows instructions to enable Enhanced Networking in AMIs that do not include the SR-IOV driver by default.
Enhanced Networking is only supported in Amazon VPC.
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Based on the explanation..
D. you must launch an HVM AMI with the appropriate drivers.
E. Amazon Linux AMI includes both of these drivers by default.
F. Enhanced Networking is only supported in Amazon VPC.
if you say B. Enhance networking.. then all above are covered..
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I am sorry, Joe is right
Ans is B, D, F
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BDF
E over F is because the question asks about highest network performance
(packets per second), lowest latency, and lowest jitter not only the performance and latency
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I choose ABE
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BDF
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BDF
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I agree with DEF.
check below which explains enhanced networking in EC2.
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/sriov-networking.html
clearly states :
– HVM AMI
– Linux VM
– VPC
any thoughts?
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I think BDF
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Not A
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/placement-groups.html
A placement group is a logical grouping of instances within a _SINGLE_ Availability Zone.
I vote for B,D,F.
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Single region not Single AZ, man
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That excludes A, man
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B D F
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Yup, B D F
Enhanced networking with Linux “kernel” HVM AMI
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I agree B D F
Enhanced networking with Linux kernel HVM AMI
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BDF is the right answer.
See https://aws.amazon.com/ec2/details/#enhanced-networking
Enhanced Networking enables you to get significantly higher packet per second (PPS) performance, lower network jitter and lower latencies. This feature uses a new network virtualization stack that provides higher I/O performance and lower CPU utilization compared to traditional implementations. In order to take advantage of Enhanced Networking, you should launch an HVM AMI in VPC, and install the appropriate driver. For instructions on how to enable Enhanced Networking on EC2 instances, see the Enhanced Networking on Linux and Enhanced Networking on Windows tutorials.
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how about A, we should use placement groups for low latency.
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A is not supported by Multi AZs
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BDF
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BDF
-A is ruled out as placement group only supports single AZ
-C is ruled out as HVM is a better option than PV.
So it is only between E and F. Given it is a multi-AZ question, F is over E.
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BDF
A – Not supported for multi-AZ
B – Enhanced Networking is a given.
C or D? – I ruled out C because of this:
Paravirtual guests traditionally performed better with storage and network operations than HVM guests because they could leverage special drivers for I/O that avoided the overhead of emulating network and disk hardware, whereas HVM guests had to translate these instructions to emulated hardware. Now these PV drivers are available for HVM guests, so operating systems that cannot be ported to run in a paravirtualized environment (such as Windows) can still see performance advantages in storage and network I/O by using them. With these PV on HVM drivers, HVM guests can get the same, or better, performance than paravirtual guests.
E – Enhanced networking is supported on both Windows and Linux….
F – The instance needs to be in a VPC to enable enhanced networking.
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You are all disregarding the fact that answer A is clearly written in plural, PLACEMENT GROUPS!
you dont need to have one PLacement group. Each servers in one AZ can be placed in one placement group for that AZ.
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BDF
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BDF
Enhanced Networking enables you to get significantly higher packet per second (PPS) performance, lower network jitter and lower latencies. ==> This is what the question is asking.
In order to take advantage of Enhanced Networking, you should launch an HVM AMI in VPC. ==> the rest of the components for Enhanced Networking to work, so I strongly believe its : BDF
https://aws.amazon.com/ec2/details/#enhanced-networking
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BDF
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BDF http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/enhanced-networking-ena.html
A. Amazon EC2 placement groups (would not work for multiple AZs)
B. Enhanced networking (provides network performance, lowest latency)
C. Amazon PV AMI –
D. Amazon HVM AMI
E. Amazon Linux –
F. Amazon VPC (Enhanced networking works only in VPC)
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BDF
Amazon EC2 placement groups (would not work for multiple AZs)
Enhanced networking (provides network performance, lowest latency)
Amazon PV AMI
Amazon HVM AMI
Amazon Linux
Amazon VPC (Enhanced networking works only in VPC)
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I choose A, D, F.
A: Placement group can be use to improve network performance within cluster.
B: Wrong. You can not select this feature. You can only make it happen after select VPN and HVM ( supported instance type )
C: Wrong. no enhanced network enabled.
D: HVM has drivers for enhanced network.
E: Wrong. You shouldn’t provide only Linux no Windows.
F: VPC is a must for enhanced network.
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Can’t have a VPC or placement groups in multiple AZs…
If you had to pick one or the other as the answer, I’d choose the placement groups as it is at least plural.
What a terrible set of answers…
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It’s not A for sure Placement Groups can’t span multiple AZ.
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THE answer will be ( B , D , F ).
– A is wrong because placement group needs to be in a single AZ and in question we have a cluster of instances across multi AZ
– C is wrong because Enhanced Networking needs HVM AMI to be enabled on the instances and Enabling enhanced networking with a PV instance can make it unreachable.
– E is wrong because Enhanced Networking could be enabled for both Linux and windows OS.
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