Expanded core chapter
Managed Switching, VLANs and Trunks
Extended teaching, worked examples, calculations and configuration or commissioning walkthroughs.
Read expanded chapterNETCOMTECH TECHNICAL TEXTBOOK
Networking Technical Textbook
A structured path from Ethernet and switching through routing, resilience, security and operations.
Read in order as a course, or jump directly to the procedure you need in the field.
Book 1
Preface
From Ethernet and VLANs to routing, resilience, firewalls, monitoring and fault finding.
What this book should give you: By the end of this book, the reader should be able to explain how business traffic moves, how networks are separated, how paths fail, and how to prove a fault with evidence instead of guesswork.
This book contains 10 linked chapters. Read it from the beginning if the subject is new. Experienced readers can use the part headings and chapter index as a reference manual.
How a chapter is written
Each chapter starts with the business problem, defines the jargon, then moves into the technical explanation. It includes a worked business scenario, practical lab work, troubleshooting, a field checklist and review questions. The aim is to connect theory to real infrastructure work.
HOW TO USE THIS TEXTBOOK
Learn the subject, then prove you can use it
Who this is for
Network installers, junior administrators and business IT staff who need to understand how traffic moves and how to prove a fault.
Why a business cares
A reliable network keeps staff, phones, cameras, cloud applications and servers connected. The course links technical design choices to downtime, support time and business continuity.
How to study
Read the chapters in order if the subject is new. Each chapter includes plain-English definitions, business context, a lab, a troubleshooting exercise, a field checklist and a summary.
PART 1: FUNDAMENTALS
Part 1: Fundamentals
Understand switching, VLANs, routing and packet flow.
Chapter 1
Networking Knowledge Centre
Start with the main networking concepts.
Open chapterChapter 2
Managed Switch, VLAN and Trunk Guide
Access ports, trunks and VLAN paths.
Open chapterChapter 3
Router, Routing, NAT, DHCP and DNS
Layer 3 forwarding and core network services.
Open chapterPART 2: RESILIENCE AND SECURITY
Part 2: Resilience and Security
Build networks that survive faults and enforce policy.
Chapter 4
STP and LACP
Loop prevention and link aggregation.
Open chapterChapter 5
Switch Stacking and Redundancy
Stack rings, member failure and uplinks.
Open chapterChapter 6
Stateful Firewall Policy
Zones and application flows.
Open chapterChapter 7
ACL and Rule Design
Ordered rules and troubleshooting.
Open chapterPART 3: OPERATIONS
Part 3: Operations
Measure, monitor and troubleshoot.
Chapter 8
SNMP, Syslog and NTP
Operational telemetry and logs.
Open chapterChapter 9
Network Baselines
Counters and normal-state baselines.
Open chapterChapter 10
Outage Triage
Incident response and controlled changes.
Open chapterNot an IT specialist?
Start with the business-language guide. It explains what the main technologies do, why companies use them and what questions to ask before buying or changing infrastructure.