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Computer Networks

Networking from OSI layers to production security — TCP/IP, HTTP versions, TLS & PKI, DNS, WebSocket, firewalls, VPN, DDoS, CDN, load balancers, API gateway, and service mesh. Basic to advanced.

OSI & TCP/IPTCP & UDPHTTP & DNSTLS & SecurityCDN & Load BalancersInterview Patterns
35 Concepts
Beginner (12)
→Intermediate (17)
→Advanced (6)

Fundamentals

5 concepts

OSI Model

Beginner

TCP/IP Model

Beginner

Network Types — LAN, WAN, MAN & VPN

Beginner

Bandwidth, Latency & Throughput

Beginner

Packets, Frames & Encapsulation

Beginner

Transport Layer

5 concepts

TCP 3-Way Handshake

Beginner

TCP Flow & Congestion Control

Intermediate

UDP — User Datagram Protocol

Beginner

Ports & Sockets

Beginner

TCP vs UDP

Beginner

Network Layer

5 concepts

IP Addressing — IPv4 & IPv6

Beginner

Subnetting & CIDR

Intermediate

NAT — Network Address Translation

Intermediate

Routing — OSPF, BGP & Static Routes

Intermediate

ARP — Address Resolution Protocol

Beginner

Application Layer

5 concepts

HTTP/1.1 vs HTTP/2 vs HTTP/3

Intermediate

HTTPS & TLS Handshake

Intermediate

DNS — Domain Name System

Beginner

WebSockets

Intermediate

gRPC vs REST

Intermediate

Security

5 concepts

TLS Handshake Deep-Dive

Advanced

Certificates & PKI

Intermediate

Firewalls & Packet Filtering

Intermediate

VPN Deep-Dive

Intermediate

DDoS Protection

Advanced

Infrastructure

5 concepts

Load Balancers

Intermediate

Reverse Proxy

Intermediate

CDN (Content Delivery Network)

Intermediate

API Gateway

Intermediate

Service Mesh

Advanced

Interview Patterns

5 concepts

What Happens When You Type a URL

Advanced

TCP Connection Lifecycle

Advanced

How DNS Resolution Works

Intermediate

Long Polling vs SSE vs WebSocket

Intermediate

NAT Traversal Patterns

Advanced
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