Web Service

Question 1

A set of clearly defined methods of communication between various components.

Answer 1

API

Question 2

Refer to a published document that defines how these methods of communication can be used.

Answer 2

API

Question 3

Refers to the actual implementation of an interface that other app/programs can call on.

Answer 3

API

Question 4

API is also used informally to refer to the ____________ that describes the usage of this interface.

Answer 4

document

Question 5

Web Services involve __________________

Answer 5

network communication

Question 6

Web Services are APIs designed to support interoperable _______________________.

Answer 6

machine-machine interaction over a network

Question 7

WS expose services to clients over a ________, using a uniform interface.

Answer 7

network

Question 8

Since many systems do not inherently interoperate well, thus the need for _______________.

Answer 8

APIs/web services.

Question 9

2 types of Web Service Implementations

Answer 9

1. Simple Object Access Protocol (SOAP)
2. Representational State Transfer (REST)

Question 10

This web service usage revolves around the exchange of XML messages.

Answer 10

SOAP

Question 11

True or False: SOAP is transport agnostic.

Answer 11

True

Question 12

In SOAP web services, req/res formats are formally defined in ____________________ files.

Answer 12

Web Service Definition (WSD) files.

Question 13

WSDs are written in Web Service Definition Language (WSDL), which has an _________________.

Answer 13

XML-like structure.

Question 14

The API for SOAP.

Answer 14

WSD - Web Service Definition

Question 15

Discovery services use the __________________________ framework for sharing and finding WSDs.

Answer 15

Universal Description, Discovery, and Integration (UDDI)

Question 16

REST

Answer 16

Representational State Transfer

Question 17

REST uses the HTTP/HTTPS protocol for message _________.

Answer 17

transport.

Question 18

True or False: Request/response payloads for RESTful web services can use any data format.

Answer 18

True

Question 19

True or False: RESTful web services are stateful.

Answer 19

False, stateless.

Question 20

RESTful Web Services use HTTP, and thus use ________.

Answer 20

HTTP urls.

Question 21

6 constraints of designing RESTful ws that limit the ways the server can process and respond to requests.

Answer 21

1. Client-Server
2. Stateless
3. Cache
4. Uniform Contract
5. Layered System
6. Code-on-Demand* (optional)

Question 22

_____________ is separated into consumer and service logic.

Answer 22

Solution Logic

Question 23

Consumers invoke services using a published _____________.

Answer 23

technical contract.

Question 24

Each request sent and processed is ________________. It doesn’t depend on context from an earlier message.

Answer 24

self-contained

Question 25

This frees up server storage space and processing power that would otherwise be used to store and read earlier messages.

Answer 25

Stateless

Question 26

Response messages are explicitly labeled as __________ or _________ for potential use.

Answer 26

cacheable or non-cacheable

Question 27

Ways to tell if the request messages are equivalent or not.

Answer 27

cache-control

Question 28

Ways to label if a response is cacheable or not, by whom, and for how long.

Answer 28

cache-control

Question 29

Improves runtime efficiency by eliminating the need to send duplicate responses.

Answer 29

Cache

Question 30

Service consumers and service providers share a common, general technical support

Answer 30

uniform contract

Question 31

Clients of a RESTful WS need to know:

Answer 31

- The URL and HTTP method for a particular operation - The required inputs - The returned outputs

Question 32

Standardizes the interaction between different entities, making interoperability possible.

Answer 32

Common general contract

Question 33

It is in the interest of all parties taht this uniform contract change as _______________.

Answer 33

Iittle as possible.

Question 34

Solutions can be comprised of multiple architectural layers.

Answer 34

Layered System

Question 35

Each layer can't ______ pas the next layer. Each service is only concerned about interacting with next layer.

Answer 35

see

Question 36

Each layer's logic can evolve independently of the others, as long as the ________________ between them remains the same.

Answer 36

general contract (API)

Question 37

Service consumers can support the execution of deferred service logic.

Answer 37

Code-on-Demand

Question 38

Code-on-Demand disadvantage

Answer 38

Consumers need an execution environment for the deferred proces.s

Question 39

May prevent server bottlenecks. But requires additional features on the consumer's part.

Answer 39

Code-on-demand

Question 40

REST Architectural goals (7)

Answer 40

PPSSMVR 1. Performance 2. Portability 3. Simplicity 4. Scalability 5. Modifiability 6. Visibility 7. Reliability

Question 41

This architectural goal considers the throughput and latency of request and responses. As well as resource utilization in the server.

Answer 41

Performance

Question 42

Sometimes, the __________________ can be tweaked to make the response seem faster without actually changing the actual time to process.

Answer 42

order of messages/data sent

Question 43

This architectural goal addresses the architecture's need to support a varying number of concurrent connections.

Answer 43

Scalability

Question 44

This architectural goal is required for an app that will change over time.

Answer 44

Modifiability

Question 45

This architectural goal lets the app be self-monitored and regulated to optimize performance

Answer 45

Visibility

Question 46

To some extent, it benefits different modules to know ________________ (though it may seem contradictory to the Layered System requirement or modularity approach).

Answer 46

the inner workings of the others

Question 47

This architectural goal refers to the ease of moving applications from deployed location to another.

Answer 47

Portability

Question 48

This architectural goal is the degree of service's susceptibility to failure.

Answer 48

Reliability

Question 49

Downtimes can be addressed by using _________________.

Answer 49

Redundant servers

Question 50

Is facebook, amazon, and twitter website or web service?

Answer 50

They are both. FB/Amazon/Twitter that we NORMALLY SEE are websites. But these companies ALSO PROVIDE WEB SERVICES meant for 3rd party apps to call on.