About Me
Web Security Associate (1D0-671)
1 Introduction to Web Security
1-1 Understanding Web Security
1-2 Importance of Web Security
1-3 Common Web Security Threats
2 Web Application Architecture
2-1 Client-Server Model
2-2 Web Application Components
2-3 Web Application Life Cycle
3 HTTP and HTTPS Protocols
3-1 HTTP Basics
3-2 HTTPS Basics
3-3 SSLTLS Protocols
3-4 Certificates and Certificate Authorities
4 Authentication and Authorization
4-1 Authentication Mechanisms
4-2 Authorization Models
4-3 Single Sign-On (SSO)
4-4 Multi-Factor Authentication (MFA)
5 Session Management
5-1 Session Handling
5-2 Session Hijacking
5-3 Session Fixation
5-4 Secure Cookie Management
6 Input Validation and Output Encoding
6-1 Input Validation Techniques
6-2 Output Encoding Techniques
6-3 Cross-Site Scripting (XSS) Prevention
6-4 SQL Injection Prevention
7 Secure Coding Practices
7-1 Secure Coding Principles
7-2 Common Vulnerabilities and Countermeasures
7-3 Code Reviews and Static Analysis
7-4 Secure Development Lifecycle (SDLC)
8 Web Application Firewalls (WAF)
8-1 WAF Functionality
8-2 WAF Deployment Models
8-3 WAF Rule Sets
8-4 WAF Monitoring and Management
9 Data Protection and Encryption
9-1 Data Encryption Techniques
9-2 Key Management
9-3 Data Integrity and Hashing
9-4 Secure Data Storage
10 Security Testing and Vulnerability Assessment
10-1 Security Testing Types
10-2 Vulnerability Assessment Tools
10-3 Penetration Testing
10-4 Security Audits
11 Incident Response and Management
11-1 Incident Detection
11-2 Incident Response Plan
11-3 Forensic Analysis
11-4 Incident Reporting and Communication
12 Legal and Compliance Issues
12-1 Data Protection Laws
12-2 Compliance Standards
12-3 Privacy Policies
12-4 Legal Responsibilities
13 Emerging Trends in Web Security
13-1 Cloud Security
13-2 Mobile Security
13-3 IoT Security
13-4 Blockchain Security
14 Case Studies and Practical Applications
14-1 Real-World Web Security Incidents
14-2 Lessons Learned
14-3 Best Practices Implementation
14-4 Future Trends in Web Security
Client-Server Model

Client-Server Model

Key Concepts

The Client-Server Model is a distributed application structure that partitions tasks or workloads between the providers of a resource or service, called servers, and service requesters, called clients. Here are the key concepts:

1. Client

A client is a computer or software that requests services or resources from a server. Clients typically initiate communication with servers, which then respond to the client's requests. Examples include web browsers, email clients, and mobile apps.

Example: When you open a web browser and type in a URL, the browser acts as a client that sends a request to the server hosting the website. The server then responds by sending back the web page content.

2. Server

A server is a computer or software that provides services or resources to clients. Servers are designed to handle multiple client requests simultaneously and efficiently. Examples include web servers, file servers, and database servers.

Example: A web server hosts websites and responds to client requests by sending the requested web pages. Similarly, a database server manages databases and responds to queries from client applications.

3. Request and Response

In the Client-Server Model, communication typically follows a request-response pattern. The client sends a request to the server, and the server processes the request and sends back a response. This interaction is fundamental to how the internet and networked applications function.

Example: When you submit a search query on a search engine, your browser (client) sends a request to the search engine's server. The server processes the query, retrieves relevant results, and sends them back to your browser as a response.

4. Network

The network is the infrastructure that connects clients and servers, enabling them to communicate. This includes physical components like cables and routers, as well as protocols like TCP/IP that govern how data is transmitted.

Example: The internet is a global network that connects millions of servers and clients. When you access a website, your request travels through various routers and cables to reach the server, and the response travels back through the same network.

Analogies

To better understand the Client-Server Model, consider the following analogy:

Think of a restaurant where customers (clients) place orders with waiters. The waiters then take these orders to the kitchen (server), where the chef prepares the food. Once the food is ready, the waiters bring it back to the customers. In this analogy, the restaurant represents the network, the customers are the clients, the waiters are the communication channels, and the kitchen is the server.

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