[SOLVED] CS代写 Final Fall 2017Computer Science 571 2nd Exam Prof. , December 7, 2017, 6:0

tag has been replaced by a number of new elements included in HTML5. Name two of them.
A1: Any 2 of header, footer, section, article, nav, aside
Q2: Which of the following capabilities are included in HTML5?
[ ] drag file in browser
[ ] interactive canvas gradient

[ ] editable content [ ] geolocation
[ ] drag and drop
[ ] storage
[X] ALL OF THE ABOVE
[You must choose the correct choice or choices. There is no partial credit]
Q3: What is the purpose of the different “profiles” included in the H. 264 video standard?
A3: each profile defines a set of “optional features” that trade complexity for file size. Q4: What is the meaning of the “preload” video attribute?
A4: specifies that the video will be loaded at page load and ready to run when pressing “play”.
Q5: If you were asked to make sure that your video files could be viewed on the large majority of browsers, what two video “containers” would you select?
A5: MPEG4 and WebM
JavaScript and Ajax Questions [10 pts]
Below is the HTML source code that produces the web page above. There are 4 links. When the user cursor is placed over each link, a pop-up widget is displayed viewing the contents of the Web page being hyperlinked.

$(function() {
var hits = 0;
$(“#updateMessage”).click(function() {
$(“#counter”).html(“Number of clicks = ” + ++hits);

(1) Requires duplication of content
(2) Over time can result in synchronization of content issues (3) May work only on a specific mobile size
Q2: Name the three “concepts” that are the basis of Responsive Website Design? A2: All three of:
(1) fluid grids
(2) flexible images
(3) CSS3 Media Queries
There is no partial credit on question A2. You must mention all 3.
Q3: What is the CSS code (property and value) to hide content on small screens?
A3: display: none; -OR- visibility: hidden;
Q4: Please write an example of a media query.
A4: Answering screen and (max-device-width: 480px) is enough
Q5: List one property of “fluid” grids.
A5: Any one of these: (a) defined using relative-based dimensions (b) define a grid divided into a specific number of columns (c) each grid element is designed with “proportional” width and height, not in pixels
Web Performance Questions [10 pts]
Each question is worth 2 points.
Q1: When estimating Web Server performance requirements, what are the three numbers that you should be estimating?
What is the number of clients that will connect per second (the “traffic”) What is the average number of bytes sent to the server (request)
What is the average number of bytes sent to the client (response)
Q2: What is a web server “farm”?

Multiple server with load balancing hardware to distribute web requests (“the “load”) across the servers.
Q3: What is the approach used by sites like CNN for Load Balancing?
DNS Redirection
Q4: What are the 2 main reasons that Nginx is recommended for high traffic sites. A4:
a) “low” memory usage and b) “large” number of requests per second for large concurrent connections (high traffic).
Q5: List two ways of improving Apache performance. A5:
Two of these:
a) Add additional RAM,
b) Tune MinSpareServers and MaxSpareServers
c) Enable HTTP compresions
d) Use Nginx as reverse-proxy
e) Use “fast:” modules liker mod_fastcgi
f) Use “direct” modules like mod_php
g) Load only “required: module for a smaller footprtint (low memory)
JavaScript Frameworks Serverless Applications Questions [10 pts]
Each question is worth 2 points.
Q1: Name two properties of Node.js? A1:
Javascript runtime built on Chrome V8Event driven Uses non-blocking IO model
Modules handle HTTP
Modules handel networking
Provides POSIX File IO

Supported by both AWS and GCP
Q2: What architectures are supported by AngulaJS A2:
MVC (Model – View – Controller)
MVVM (Model – View – ViewModel)
Q3: What is the approach used by sites like CNN for Load Balancing? A3: Which of the following are true of Serverless Architectures?
[X] No compute resource to manage
[ ] Provisioning and scaling handled by the client
[X] Execution environment provided by service
[X] Provides authorization and authentication services [ ] All of the above
Note: there is no partial credit
Q4: What are the 2 main reasons that Nginx is recommended for high traffic sites. A4: Which of the following are true of AWS Lambda?
[X] No servers to manage [X] Continuous scaling
[ ] Subminute metering [X] bring your oen code
[ ] Complex resource model
[X] Flexible Authorization and Use
[ ] Not suitable for real-time data processing [X] Easy to build scalable backend services [ ] All of the above
Note: there is no partial credit
Q5: What is this code an example of?
exports.helloGET = function helloGET (req, res) {
res.send(‘Hello World!’);
A5: A Google Cloud Function
Agile Development Questions [10 pts]

Each question is worth 2 points.
Q1-Q3: What is the difference between non-agile and agile regarding each of these? Complete the missing portion of the phrases.
A1: Regarding documents
Non-agile: document-driven
Agile: high bandwidth communication
A2: Process
Non-agile: serial
Agile: iterative
A3: Testing
Non-agile: test late
Agile: test early and continuously
Q4: Who make up the observers or “chickens” in agile development?
People that do not have deliverables in the sprint, like stakeholders, non-stakeholder, and Subject-Matter-Experts (SMEs).
Q5: What is a Scrum “retrospective”?
A5: Scrum team does a port-mortem after a sprint.

程序代写 CS代考 加微信: assignmentchef QQ: 1823890830 Email: [email protected]