Cisco CCST IT Support Study Guide (100-140)

Preparing for the Cisco CCST IT Support exam (100-140)? This is the complete study guide — six chapters covering all six official exam domains, written in plain language for entry-level candidates.

The real exam: about 40–50 questions in 50 minutes, US$125, entry level, no prerequisites. It tests the work of a real help desk: managing a ticket queue, documenting clearly, troubleshooting in a disciplined order, fixing hardware, connectivity, and operating system problems, spotting security threats, and using the tools of the trade — and this guide is built for exactly that kind of test.

What's inside:- Chapter 1 — IT Support Job Tasks and Responsibilities: queue management, time management, ticketing systems, service level agreements (SLAs), key performance indicators (KPIs), how to document a customer interaction so it stays useful, Cisco's eight-step problem solving process, and the interpersonal skills Cisco expects — professional communication, active listening, and explaining technical ideas to non-technical people

• Chapter 2 — Hardware Issues: safety first (electrical shock, ESD, fire), finding device information with Windows and macOS tools (Task Manager, System Information, Activity Monitor), every port and cable the exam names (HDMI, DisplayPort, USB-C, Thunderbolt, RJ-45, and more), installing and upgrading RAM, storage (SATA, SSD, NVMe, M.2), and expansion cards, and investigating common hardware failures

• Chapter 3 — Connectivity and Resource Access Issues: Active Directory, Entra ID, and AWS IAM, multifactor authentication, mapping shared and cloud drives, group policy updates, password resets and permission checks, the full run of peripheral problems (printers, headsets, webcams, scanners), and end-device connectivity — DNS, DHCP, APIPA, and the command set (ping, ipconfig, tracert, nslookup, netstat) that proves where a connection breaks

• Chapter 4 — Operating System and Application Issues: Windows problems (displays, BitLocker codes, updates, Safe Mode, OneDrive backup), macOS problems (permissions, AirDrop, Time Machine), mobile device problems (charging, email setup, MDM), virtualization and cloud terminology (AWS, Azure, GCP, hypervisors), and common application issues, including why software only ever comes from approved sources

• Chapter 5 — Common Threats and Preventions: phishing, malware, spam, spoofing, and unauthorized access attempts — how to recognize them, run a first investigation, help a user scan, and escalate at the right moment; social engineering aimed at the help desk itself (you are the prime target), and how company policies and confidentiality rules protect user data and PII

• Chapter 6 — Job Tools: remote access software (Remote Desktop, Remote Assistance, Webex, TeamViewer, VNC, and more) and how to run a safe session, plus researching problems with AI, search, forums, and knowledge bases — including the limits of AI, its privacy risks, and predictive vs. generative AI — and documenting what you find

One honest note: Cisco does not publish percentage weights for the 100-140 domains, so no part of this guide claims one domain matters more than another. Treat every domain as testable, because it is.

Files included (1): ccst-it-support-study-guide.pdf — the complete 6-chapter guide (115 pages)

Want practice questions too? The Deluxe tier adds the full 500-question practice bank and the cheat sheets, plus license-key access to the online practice hub.

Independent study material. Not affiliated with or endorsed by Cisco.