P4L4 - Datacenter Technologies

Question 1

What is an internet service

Answer 1

Any type of service accessible via a web interface

Question 2

How do users communicate with internet services?

Answer 2

Traditionally via web requests issued by their web browers

Question 3

Describe how internet services are commonly divided

Answer 3

1. Presentation Tier - static content related to webpage layout
2. Business Logic Tier - Business-specific processing
3. Database Tier - Data storage /management

Question 4

T/F: The different tiers of internet services do not need to run as separate processes on separate machines

Answer 4

True!

Question 5

What can be used to connect the components of an internet services

Answer 5

middleware

Question 6

Describe the concept of homogeneous architecture

Answer 6

Any node can process any type of request and perform any of the processing actions that is required

Question 7

What are the benefits of homogeneous architectures

Answer 7

Front-end load balance can be kept very simple

Question 8

What is a downside of homogeneous architecture

Answer 8

Little opportunity to benefit from caching!

Question 9

Describe the concept of heterogeneous architecture

Answer 9

Different nodes are designated to perform certain functions or handle certain types of requests

Question 10

What is a benefit of heterogeneous architecture?

Answer 10

System can benefit from caching and locality

Question 11

What is a downside of heterogeneous architecture?

Answer 11

Front-end needs to be more complex. It now needs to perform some request parsing to determine which node it should route the request to

Question 12

What are the goals of cloud computing?

Answer 12

1. On demand elastic resources and services
2. Fine grained pricing based on usage
3. Professionally managed and hosted
4. API-based access

Question 13

What does cloud computing provide?

Answer 13

Shared resources

Question 14

Why does cloud computing work

Answer 14

1. Law of large numbers - Average resource needs across a large number of clients will remain fairly constant
2. Economies of Scale - Cloud provide is able to leverage a large number of customers on a single piece of hardware

Question 15

List the cloud deployment models

Answer 15

1. Public clouds
2. Private clouds
3. Hybrid cloud
4. Community Clouds

Question 16

Describe the public cloud deployment model

Answer 16

Infrastructure belongs to the cloud provider and third party customers/tenants can rent the hardware to perform their tasks

Question 17

Describe the private cloud deployment model

Answer 17

Infrastructure and software is owned by the same entity.

Question 18

Describe the hybrid cloud deployment model

Answer 18

Combination of public and private clouds

Question 19

Describe the community cloud deployment model

Answer 19

Public clouds that are used by certain types of users