Course Roadmap
01
Introduction to Networking
02
Networking Fundamentals
03
Data Link Layer
04
Network Layer
05
Transport Layer
01
TCP vs UDP: When Each Wins
High
02
The TCP Three-Way Handshake
High
03
TCP Connection Termination
High
04
TCP Header Anatomy
Medium
05
Reliability: Sequence Numbers, ACKs, Retransmission
High
06
Flow Control & the Sliding Window
High
07
Congestion Control: Slow Start, AIMD, Reno, Cubic, BBR
High
08
Head-of-Line Blocking
Medium
09
UDP Internals
Medium
10
TCP Tuning Knobs in Production
Low
11
Interview Questions
High
06
DNS
07
HTTP and HTTPS
01
HTTP Request/Response Anatomy
High
02
HTTP Methods and Idempotency
High
03
HTTP Status Codes
High
04
HTTP Headers
High
05
HTTP/1.1 vs HTTP/2 vs HTTP/3
High
06
Persistent Connections, Pipelining, and Multiplexing
Medium
07
HTTP/2 Internals
Medium
08
HTTP/3 and QUIC
Medium
09
TLS Handshake Step-by-Step
High
10
Certificates and PKI
Medium
11
HTTP Caching in Browsers, Proxies, and CDNs
High
12
Interview Questions
High
08
Modern Application Protocols
09
Socket Programming
01
What Is a Socket?
High
02
TCP Socket Programming
Medium
03
UDP Socket Programming
Low
04
Handling Multiple Clients with Threads
Medium
05
Non-Blocking I/O and select()
Medium
06
epoll, kqueue, and IOCP
Medium
07
Async Networking with asyncio and Java NIO
Medium
08
Building a Concurrent TCP Echo Server
Low
09
Interview Questions
High
10
Network Tools and Packet Analysis
11
Network Performance
01
Latency vs Throughput vs Bandwidth
High
02
The Bandwidth-Delay Product
Medium
03
Where Latency Comes From
High
04
TCP Optimization in Production
Medium
05
Connection Pooling and Keep-Alive
High
06
HTTP Caching Strategies
High
07
CDNs and Edge Networks
High
08
Compression
Medium
09
Finding Network Bottlenecks in Production
Medium
10
Interview Questions
High
12
Networking in Distributed Systems
01
The Eight Fallacies of Distributed Computing
Medium
02
Failure Modes: Timeouts, Partial Failures, Partitions
High
03
Retry Strategies and Exponential Backoff
High
04
Idempotency: Why Retries Need It
High
05
Circuit Breakers
High
06
Load Balancing: Layer 4 vs Layer 7
High
07
Health Checks and Service Discovery
Medium
08
Graceful Shutdown and Connection Draining
Medium
09
Backpressure and Rate Limiting
High
10
Interview Questions
High
13
Network Security
01
TLS/SSL Deep Dive
High
02
Certificate Validation and Common Failures
Medium
03
Common Attacks: MITM, Replay, and Downgrade
Medium
04
DDoS: SYN Floods, Amplification, and Slowloris
High
05
DNS Spoofing and Cache Poisoning
Low
06
Firewalls and IDS/IPS
Medium
07
VPN Protocols: IPsec, WireGuard, and OpenVPN
Low
08
Zero Trust Networking
Low
09
Interview Questions
High