Unit 4: Application Layer Protocols & Network Management

Unit 4 Learning Hub

Application Layer Protocols & Network Management

Official MJPRU BCA Unit 4: Application Layer Protocols & Network Management for BCA-208N (Computer Networks).

Syllabus Topics:Application Layer Overview: Client-Server Programming Paradigm, Socket API (Socket, Bind, Listen, Accept, Connect, Send, Recv)Domain Name System (DNS): Distributed Hierarchical Database, Name Space (Root, TLD, Second-Level, Subdomains)DNS Operation: Recursive vs Iterative Query Resolution, DNS Caching, DNS Resource Records (A, AAAA, CNAME, MX, NS, PTR)Dynamic DNS (DDNS): Automated IP Address Mapping for Dynamic Host ConfigurationsRemote Logging - TELNET: Virtual Terminal Protocol, Network Virtual Terminal (NVT), Security Vulnerabilities (Plaintext Passwords)Secure Shell (SSH): Encrypted Remote Terminal Connection, Public-Key Authentication, Port Forwarding / TunnelingElectronic Mail Architecture: User Agent (MUA), Message Transfer Agent (MTA), Message Access Agent (MAA)Email Protocols: Simple Mail Transfer Protocol (SMTP, Port 25/587), Post Office Protocol (POP3, Port 110), Internet Message Access Protocol (IMAP4, Port 143)File Transfer Protocol (FTP): Dual Connection Architecture (Control Connection Port 21, Data Connection Port 20), Active vs Passive FTP ModesHypertext Transfer Protocol (HTTP): Client-Server Request-Response Model, Uniform Resource Identifier (URI/URL)HTTP Methods (GET, POST, PUT, DELETE, HEAD), Status Codes (200 OK, 301 Redirect, 404 Not Found, 500 Server Error)Persistent vs Non-Persistent HTTP, HTTP/1.1 vs HTTP/2 vs HTTP/3, Cookies and Web CachingSimple Network Management Protocol (SNMP): Architecture (Manager, Agent, MIB, SMI), SNMP Operations (Get, Set, Trap), UDP Port 161/162

Card 1 of 5·+0 XP earned

Introduction to Computers & The IPO Cycle

💻

Topic 1 · The foundation of modern computing

Introduction to Computers & The IPO Cycle

+25 XP

🐾

Ready to master this concept? Give it a quick read & tap the check!

💡 The Big Picture:A computer is an electronic system that takes raw data as Input, processes it under programmed logic, and produces meaningful Information as Output.

🍪 Everyday Analogy:Think of baking cookies: Flour & Sugar (Input) ➔ The Oven (Processing) ➔ Warm Delicious Cookie (Output)! 🍪

Key Exam Takeaways

·Data = Raw, unprocessed facts without context (e.g. 42, 'apple').
·Information = Structured data with meaning (e.g. 'Temperature: 42°C').
·Hardware is what you can touch; Software is the instructions running inside.

Instant Knowledge Check

+20 XP

Which of the following represents unprocessed raw facts?

1/5