Elastic Load Balancing and Auto Scaling

Question 1

Auto Scaling responds to EC2 ______ checks and ________ metrics

Answer 1

Auto Scaling responds to EC2 status checks and CloudWatch metrics

Question 2

Auto-scaling can be scaled based on _____ or on a _____

Answer 2

Auto-scaling can scale based on demand on a schedule

Question 3

_______ policies define how to respond to _______ in demand

Answer 3

Scaling policies define how to respond to changes in demand

Question 4

Auto Scaling groups define collections of EC2 instances that are ______ and _________ together

Answer 4

Auto Scaling groups define collections of EC2 instances that are scaled and managed together

Question 5

What are the health check options available to EC2 instances? (2)

Answer 5

EC2 status checks

ELB uses the ELB health checks in addition to EC2 status checks

Question 6

Auto Scaling - Monitoring:

How long is the granularity with Basic monitoring?

Is this a free service or are you charged?

Answer 6

5 minute granularity

No charge

Question 7

Auto Scaling - Monitoring:
How long is the granularity with Detailed monitoring?

Is this a free service or are you charged?

Answer 7

• 1 minute granularity
• Charges apply

Question 8

The Auto Scaling setting, known as Cooldowns, is used with a simple scaling policy to prevent Auto Scaling from __________ or ___________ instances before the effects of previous activities are _______.

Answer 8

The Auto Scaling setting, known as Cooldowns, is used with a simple scaling policy to prevent Auto Scaling from launching or terminating instances before the effects of previous activities are visible.

Question 9

The Auto Scaling setting, known as Termination Policy, defines which instances to _________ first when a ______-__ event occurs

Answer 9

The Auto Scaling setting, known as Termination Policy, defines which instances to terminate first when a scale-in event occurs

Question 10

The Auto Scaling setting, known as Termination Protection, prevents Auto Scaling from terminating ________ ________

Answer 10

The Auto Scaling setting, known as Termination Protection, prevents Auto Scaling from terminating protected instances

Question 11

What is the reason for placing an instance from the “InService” state into the “Standby” state?

Answer 11

To update or troubleshoot the instance

Question 12

Additional Scaling Settings:

A _________ ____ provides a specified amount of time to wait for the action to complete before the instance can _________ to the ____ _____

Answer 12

A lifecycle hook provides a specified amount of time to wait for the action to complete before the instance can transition to the next state

Question 13

ELB Distributes incoming application traffic across multiple targets: What are they? (4)

Answer 13

• Amazon EC2 Instances
• Containers
• IP Addresses
• Lambda functions

Question 14

ELB Provides _____ _________ for applications

Answer 14

ELB Provides Fault tolerance for applications

Question 15

ELB distributes incoming traffic to a _____ __ or ________ __

Answer 15

ELB distributes incoming traffic to a Single AZ or Multiple AZs

Question 16

In ELB, only ___ ______ per AZ can be enabled for each ELB

Answer 16

In ELB, only one subnet per AZ can be enabled for each ELB

Question 17

Auto Scaling - Monitoring:

Group ______ provides data about the Auto Scaling Group (ASG).

Answer 17

Group metrics provide data about the Auto Scaling Group (ASG).

Question 18

To ensure that your load balancer can scale properly, verify that each Availability Zone has a /___ subnet and at least __ IP addresses per subnet

Answer 18

To ensure that your load balancer can scale properly, verify that each Availability Zone has a /27 subnet and at least 8 IP addresses per subnet

Question 19

ELB can be Internet facing or ____-____

Answer 19

Internal-only

Question 20

Internet-facing ELB nodes have ______ IPs that Route traffic to ______ IP addresses of the EC2 instances

Answer 20

Internet-facing ELB nodes have public IPs that Route traffic to private IP addresses of the EC2 instances

Question 21

________ only ELB nodes routes traffic to the ________ IP addresses of the EC2 instances

Answer 21

Internal only ELB nodes routes traffic to the private IP addresses of the EC2 instances

Question 22

Application Load Balancer Use Cases: (2)

Answer 22

• Microservices architectures (e.g. Docker containers)
• Lambda targets

Question 23

Gateway Load Balancer operates at which layer of the OSI model?

Answer 23

• Layer 3/ Networking

Question 24

When Cross-Zone Load Balancing is enabled each load balancer ____ distributes traffic across all enabled ___

Answer 24

When Cross-Zone Load Balancing is enabled each load balancer node distributes traffic across all enabled AZs

Question 25

With ___________ Load Balancers, cross-zone load balancing is enabled by default

Answer 25

With **Application** Load Balancers, cross-zone load balancing is enabled by default

Question 26

With Network Load Balancers and Gateway Load Balancers, cross-zone load balancing is _____ by \_\_\_\_\_\_

Answer 26

With Network Load Balancers and Gateway Load Balancers, cross-zone load balancing is **disabled by default**

Question 27

Gateway Load Balancer listens for packets on which ports?

Answer 27

Listens for all IP Packets on all ports

Question 28

Gateway Load Balancer are used with Virtual Appliances such as: (3)

Answer 28

Firewalls (IDS)/ (IPS) Deep packet inspection systems (DPI)

Question 29

Application Load Balancers listeners check for connection requests from clients using the **\_\_\_\_\_\_\_\_\_** and **\_\_\_\_** you configure

Answer 29

Application Load Balancers listeners check for connection requests from clients using the **protocol** and **port** you configure

Question 30

Application Load Balancers **\_\_\_\_** determine how to **\_\_\_\_** requests to its **\_\_\_\_\_\_\_\_\_\_ \_\_\_\_\_\_\_**

Answer 30

Application Load Balancers **rules** determine how to **route** requests to its **registered targets**

Question 31

A limitation of Application Load Balancers is that they only support

Answer 31

HTTP and HTTPS

Question 32

To use an **\_\_\_\_\_** listener with an Application Load Balancer, you must deploy at least one SSL/TLSS server **\_\_\_\_\_\_\_\_\_\_** on your load balancer

Answer 32

To use an **HTTPS** listener with an Application Load Balancer, you must deploy at least one SSL/TLSS server **certificate** on your load balancer

Question 33

Classic Load Balancer gives you a 504 error: The gateway has **\_\_\_\_\_\_ \_\_\_** which means the application is not **\_\_\_\_\_\_\_\_\_\_** within the idle **\_\_\_\_\_\_\_** period

Answer 33

The gateway has **timed out,** which means the application is **not responding** within the idle **timeout** period

Question 34

When using an internet-facing ELB, you need one ______ \_\_\_\_\_\_ in each ___ where the ELB is defined

Answer 34

When using an internet-facing ELB, you need one **public subnet** in each **AZ** where the ELB is defined

Question 35

Sticky sessions enable your users to **\_\_\_\_\_\_** to the same **\_\_\_\_ \_\_\_\_\_\_\_\_\_** every time they connect

Answer 35

Sticky sessions enable your users to **stick** to the same **EC2 instance** every time they connect

Question 36

If you remove an instance from a pool, but the (ELB) continues to direct traffic to that EC2 instance. What is the fix?

Answer 36

Disable sticky sessions

Question 37

When Deregistration Delay is enabled existing **\_\_\_\_\_\_\_\_\_\_\_\_\_** will remain **\_\_\_\_** if the EC2 instance becomes **\_\_\_\_\_\_\_\_\_**

Answer 37

When Deregistration Delay is enabled existing **connections** will remain **open** if the EC2 instance becomes **unhealthy**

Question 38

A use case for a lifecycle hook would be to run a script to download and install software after **\_\_\_\_\_\_\_\_\_** or - Pause an instance to process data before a **\_\_\_\_\_-\_\_**

Answer 38

A use case for a lifecycle hook would be to run a script to download and install **software** after **launching** or - Pause an instance to process data before a **scale-in**(**termination**)

Question 39

When Cross-Zone Load Balancing is **\_\_\_\_\_\_\_\_\_**, it only distributes traffic across the registered **\_\_\_\_\_\_\_** in its \_\_\_

Answer 39

When Cross-Zone Load Balancing is **disabled**, it only distributes traffic across the registered **targets** in its AZ

Question 40

Group metrics is an Auto Scaling Monitoring feature that is **\_\_\_ \_\_\_\_\_\_\_** by default

Answer 40

Group metrics is an Auto Scaling Monitoring feature that is **not** **enabled** by default

Question 41

What is the default time period for the Auto Scaling setting, known as Cooldowns?

Answer 41

The default value for the Auto Scaling setting, known as Cooldowns is **300 sec or 5 min**

Question 42

When enabled what is the default time a lifecycle hook provides you?

Answer 42

When enabled what is the default time a lifecycle hook provides you? **1** **hour by default**

Question 43

When Deregistration Delay is disabled existing **\_\_\_\_\_\_\_\_\_\_\_\_** is immediately **\_\_\_\_\_** if the EC2 instance becomes **\_\_\_\_\_\_\_\_\_\_**

Answer 43

When Deregistration Delay is disabled existing **connections** is immediately **closed** if the EC2 instance becomes **unhealthy**