12 - Networked Appl. Architectures

Question 1

What is a monolithic application?

Answer 1

• A single tiered software app where UI and data access code are combined in a single program
• run mainframe w/ dumb terminals
• char based interfaces

Question 2

What is a network app?

Answer 2

• provide ability to split apps along various lines
• client server, 2/3 tier, objects
• P2P, parallel computing, web appl

Question 3

Benefits of network appl?

Answer 3

• Easier programming, sociability, security, less code on client

Question 4

Details of mobile, web and framework tech

Answer 4

• Became very easy to write web app, (.Net, Python/Django, Ruby on Rails)
• Hard to split functionality neatly into business and logic layers
• Clients need to be smart and efficient, cache local data

Question 5

What is a frameworks setup?

Answer 5

An abstraction where in software can be selectively added to or edited

Question 6

Name client appl.

Answer 6

• Mobile: iOS, Android
• Portable: PhoneGap, HTML5, JQuery
• Frameworks: AngularJS, Meteor

Question 7

Cloud/Web Appl Adv.

Answer 7

• Easier to build through frameworks

- Scalable through cloud computing

Question 8

Load Balancing Alg characteristics

Answer 8

• Allows for multiple web servers
• Load balanced for between 1 - (n-1) servers
• Server Load,
• Num of connections
• Round-robin

Question 9

What is DevOps?

Answer 9

• Collaboration between development and operations for deployment

Question 10

HTTP is …

Answer 10

session-less, so state needs to be saved between requests from a client

Question 11

Cookies..

Answer 11

Used to store IDs and Auth codes

Question 12

For load-balancing servers, may need..

Answer 12

• Sticky sessions (method used w/ App load balancing to achieve server affinity)
• Shared session state server (in-memory, database)

Question 13

Benefits of load balancing (3)

Answer 13

• Update servers by: - Drain connections, remove from LB, update it, add back to LB
• Scaling allows for additional servers to be added
• SSL access: terminate SSL at LB and pass traffic on HTTP

Question 14

What is typical database?

Answer 14

Relational database as data store

Question 15

What efficiencies does a database have?

Answer 15

• Horizontal: through partitioning, replicas & load balancing
• Vertical: larger servers

Question 16

Network Comms ….

Answer 16

• Low-level sockets,

- RMI (Remote Method Invocation), takes method invocation and creates proxies with socket comms in between

Question 17

HTTP Request Method Types:

Answer 17

• GET

- POST

Question 18

HTTP Response Codes
200
302
400
500
502

Answer 18

• 200 OK
• 302 Found
• 400 Bad Request
• 500 Int Server Error
• 502 Bad Gateway