Section 10 Chapter 61 - Client Server Model

Question 1

Client Server Model

Answer 1

A client sends a request message and the server should respond with the data requested

Question 2

WebSocket protocol

Answer 2

Defines an API establishing a full duplex (bidirectional) connection between the client and the server. Packets are constantly being sent both ways and the packets have no security checks and much smaller header data. The connection is persistent

Question 3

CRUD mappings

Answer 3

CRUD - HTTP - SQL
Create - Post - Insert
Retrieve - Get - Select
Update - Put - Update
Delete - Delete - Delete

Question 4

Use of REST

Answer 4

Client requests some data and sends the command using CRUD. Client side javascript passes HTTP request to database server. Server returns an JSON/XML response which is forwarded to client

Question 5

Advantages of JSON over XML (4)

Answer 5

• Easier to read
• Compact
• Easier to create
• Easier to parse

Question 6

Thin vs Thick client

Answer 6

The thickness of a client refers to how much processing and storage is done on the client vs on the server