The Bits and Bytes of Computer Networking Course

Lesson 1 • Introduction to Network Standards Bodies

Surveys organizations that define interoperability standards and why they matter. Sets context for protocol specifications covered throughout the course.

Lesson 2 • Core Network Hardware Components

Identifies routers, switches, hubs, and access points and their distinct roles. Builds hardware literacy needed for all later configuration topics.

Lesson 3 • Network Topologies and Layouts

Examines physical and logical arrangements of network devices. Connects topology choice to performance, fault tolerance, and cost trade-offs.

Lesson 4 • How Data Moves Across a Network

Explains packet switching, data encapsulation, and transmission modes. Provides the conceptual basis for understanding protocols in later chapters.

Lesson 1 • Applying the Models to Real Traffic

Uses packet captures and diagrams to identify layer activity in live traffic. Develops analytical skills applied in troubleshooting chapters ahead.

Lesson 2 • Why Layered Models Exist

Explains abstraction, modularity, and vendor interoperability as drivers of layered design. Motivates the OSI and TCP/IP models before detailing their layers.

Lesson 3 • The TCP/IP Four-Layer Model

Maps TCP/IP layers to OSI equivalents and explains why TCP/IP dominates modern networking. Bridges theoretical OSI knowledge to practical internet protocols.

Lesson 4 • The Seven Layers of the OSI Model

Defines each OSI layer's responsibilities, data unit, and key protocols. Provides the reference framework used throughout the rest of the course.

Lesson 1 • IPv6 Addressing Fundamentals

Introduces 128-bit IPv6 structure, notation rules, and address types. Prepares students for dual-stack environments covered in advanced chapters.

Lesson 2 • Subnet Masks and CIDR Notation

Explains how subnet masks divide addresses into network and host portions. Introduces CIDR slash notation as the modern replacement for classful addressing.

Lesson 3 • Address Assignment Methods

Covers static assignment, DHCP, and APIPA as mechanisms for distributing IP addresses. Connects addressing theory to operational network management.

Lesson 4 • IPv4 Address Structure and Classes

Breaks down the 32-bit IPv4 address into octets, classes, and reserved ranges. Establishes addressing fundamentals required for subnetting calculations.

Lesson 1 • DNS: The Internet's Directory Service

Explains how DNS resolves hostnames to IP addresses through a hierarchical system. Directly enables understanding of application-layer traffic in later chapters.

Lesson 2 • File Transfer and Remote Access Protocols

Covers FTP, SFTP, SCP, SSH, and Telnet for data transfer and remote management. Highlights security trade-offs between legacy and modern alternatives.

Lesson 3 • HTTP and HTTPS Communication

Details request-response cycles, methods, status codes, and TLS encryption. Provides protocol literacy essential for web application and security topics.

Lesson 4 • Network Management Protocols

Introduces SNMP, NTP, and Syslog for monitoring, time synchronization, and logging. Connects protocol knowledge to operational visibility and compliance needs.

Lesson 1 • Trunk Links and 802.1Q Tagging

Explains how trunk ports carry multiple VLANs using 802.1Q frame tagging. Connects VLAN segmentation to multi-switch and router-on-a-stick designs.

Lesson 2 • How Ethernet Switching Works

Explains MAC address table building, frame forwarding, and collision domain elimination. Establishes the Layer 2 foundation for all switching and VLAN topics.

Lesson 3 • Layer 3 Switching and Inter-VLAN Routing

Introduces multilayer switches that route between VLANs without an external router. Advances students from basic switching to integrated Layer 2/3 design.

Lesson 4 • Spanning Tree Protocol

Covers STP's role in preventing Layer 2 loops in redundant switched networks. Explains root bridge election, port roles, and convergence behavior.

Lesson 1 • Border Gateway Protocol and Internet Routing

Introduces BGP as the exterior gateway protocol connecting autonomous systems on the internet. Explains path attributes, policy-based routing, and BGP's role at scale.

Lesson 2 • How Routers Make Forwarding Decisions

Explains routing table lookup, longest prefix match, and administrative distance. Provides the decision logic underlying all static and dynamic routing.

Lesson 3 • Link State Routing with OSPF

Details OSPF's LSA flooding, SPF algorithm, and area design for scalable routing. Represents the dominant enterprise interior gateway protocol students will encounter.

Lesson 4 • Distance Vector Routing Protocols

Examines RIP and EIGRP as distance vector protocols using hop count and composite metrics. Contrasts their convergence behavior and scalability characteristics.

Lesson 1 • VPNs and Encrypted Tunneling

Covers IPsec, SSL/TLS VPNs, and tunneling protocols for secure remote connectivity. Addresses both site-to-site and client-to-site VPN architectures.

Lesson 2 • Network Address Translation

Explains static NAT, dynamic NAT, and PAT as mechanisms for IP address conservation and hiding. Connects NAT to both security and IPv4 address exhaustion solutions.

Lesson 3 • Core Security Concepts and Threat Landscape

Defines confidentiality, integrity, and availability as the CIA triad and maps common threats to each. Frames all subsequent security controls within a risk-management mindset.

Lesson 4 • Firewalls and Access Control Lists

Compares stateless ACLs and stateful firewalls as traffic filtering mechanisms. Teaches rule creation logic applied to both router ACLs and firewall policies.

Lesson 1 • Essential Diagnostic Command-Line Tools

Covers ping, traceroute, nslookup, netstat, and ipconfig/ifconfig for rapid fault isolation. Connects each tool to the OSI layer it interrogates.

Lesson 2 • Network Performance Optimization

Addresses QoS marking, traffic shaping, and bandwidth management for performance tuning. Prepares students to meet service-level requirements in production environments.

Lesson 3 • Structured Troubleshooting Methodology

Introduces top-down, bottom-up, and divide-and-conquer diagnostic approaches. Establishes a repeatable process that prevents guesswork in fault isolation.

Lesson 4 • Common Layer 1 Through 4 Failures

Catalogs physical, data link, network, and transport layer failure symptoms and causes. Enables rapid layer-specific diagnosis using the OSI model as a guide.