The CCST Networking exam and entry-level network roles

On a gray Tuesday morning in October, the phones at Brightline IT Services in Omaha start ringing at 7:52. Prairie Paws Veterinary Clinic, one of the company's longest-standing clients, cannot open its practice-management app at the second location. Reception can still print labels, and the card terminal still works, but every computer in the exam rooms shows a spinning wheel. Jordan Pelletier, who joined Brightline in September as a junior technician, takes the call. Two months ago Jordan would have restarted every computer in the building. Today Jordan asks the receptionist three questions, opens the ticket BL-24903, and walks over to the desk of Dev Anand, the company's network technician.

Dev listens, checks the clinic's network diagram on his second monitor, and asks Jordan which of the three facts matters most. Jordan thinks for a moment. The card terminal works, so the internet connection at the site is up. The label printers work, so the local network inside the building is up. The app runs from a server at the main location, so the problem is probably the link between the two sites. Dev smiles. Twenty minutes later the clinic's internet provider confirms that a configuration change overnight broke the tunnel between the locations, and the app comes back. Dev tells Jordan that what just happened, reasoning from symptoms to a layer of the network, is the core of the Cisco Certified Support Technician Networking certification, and that they are going to spend the next few months working through it together.

This course, CSCO-111, is the first half of HSM University's preparation for that exam. It covers the foundations: the models that describe networks, Ethernet and MAC addresses, IPv4 and IPv6 addressing including subnetting, copper, fiber and wireless media, the jobs of common network devices, protocols and port numbers, and the topologies and diagrams technicians read every day. The second course, CSCO-112, covers device management, switching and routing concepts, network services, security basics and troubleshooting. A third course, CSCO-190, is the final review and practice before the exam.

What the CCST certifications are

Cisco offers certifications at several levels. For many years the starting point was the Cisco Certified Network Associate, or CCNA, a demanding exam that expects candidates to configure and troubleshoot switches and routers. In the early 2020s Cisco introduced a new entry tier, the Cisco Certified Support Technician, or CCST, aimed at people starting out in IT: students, career changers, and help-desk staff who want to prove they understand the basics. The CCST family includes several separate certifications, each with its own exam. CCST IT Support covers computer hardware, operating systems and help-desk work. CCST Networking covers how networks are built and how to diagnose them. CCST Cybersecurity covers security principles, threats and incident handling.

Each CCST is a certification on its own, not a step that must be completed before the next. A candidate can take CCST Networking without CCST IT Support, and neither is required before the CCNA. Many people use them as a ladder anyway: CCST IT Support for a first help-desk job, CCST Networking to show they are ready for network support work, and the CCNA once they have more hands-on experience. At Brightline, Owen Larkin, the owner, pays the exam fee for any technician who passes, and he has asked Jordan to sit CCST IT Support first and CCST Networking later in 2027.

The CCST Networking exam has the code 100-150. Cisco publishes the topics an exam covers in a document called the exam topics or blueprint, and it revises them from time to time. Before you book the exam, check which version of the exam topics is current on Cisco's Learning Network and compare it with this course. The objectives in this course follow the exam topics as they were published in 2026.

Exam facts you can rely on

Cisco's exam page for 100-150 CCST Networking lists the exam length as 50 minutes and the price as 125 US dollars, with local pricing in other currencies. The exam is offered in seven languages, including English, French and Spanish. CCST exams have been delivered through Certiport, both at authorized testing centers such as colleges and training centers and through online proctoring at home. Always confirm the current delivery options, price and policies on Cisco's site when you are ready to book, because they change.

Some details are not published by Cisco. The number of questions is not stated on the exam page; study guides commonly report around 40 to 50 items. Cisco does not publish a numeric passing score for CCST exams either; you receive a pass or fail result with a breakdown by section. Some guides suggest aiming for 70 to 80 out of 100 on practice tests, but treat any number like that as advice, not a rule. The safest plan is to understand every objective well enough to explain it, not to aim for a minimum score.

The six exam domains

The exam topics are grouped into six domains. The first, standards and concepts, covers network models, network types, topologies, bandwidth and latency, and common protocols. The second, addressing and subnet formats, covers MAC addresses, IPv4 addressing and subnetting, and IPv6. The third, endpoints and media types, covers copper, fiber and coaxial cable, wireless standards and the devices people connect. The fourth, infrastructure, covers switches, routers, access points, firewalls, VLANs, and services such as DHCP, DNS and NAT, along with cloud basics. The fifth, diagnosing problems, covers troubleshooting methods and diagnostic commands. The sixth, security, covers firewalls, VPNs, wireless security, authentication and common threats.

Cisco does not publish weights for the CCST Networking domains, so you cannot safely skip any of them. This course covers the first three domains in depth and introduces the devices from the fourth. CSCO-112 takes the fourth, fifth and sixth domains further. The figure below shows how the domains are split between the two courses.

Entry-level network roles

The CCST Networking certification is designed for people who will support networks rather than design them. Job titles vary from employer to employer, but most entry-level roles fall into a few groups. A help-desk or service-desk technician takes calls and tickets from users, solves the common problems and escalates the rest. A desktop or field support technician visits sites to install, move and repair equipment, including patch cables, switches and access points. A network operations center technician, often called a NOC technician, watches monitoring dashboards for a larger organization or a service provider, responds to alerts, and follows runbooks to restore service. A junior network administrator in a small organization might do all of these jobs in a single day.

At a managed-services provider like Brightline, the lines blur. Jordan answers the phones in the morning, drives to Kettle & Crumb Bakery at noon to replace a failed receipt printer, and spends the afternoon helping Dev plan new addresses for the bakery's third shop. Dev says the most valuable skill in all these roles is not memorizing port numbers but knowing how a network fits together, so that every symptom points to a likely cause.

What a network technician actually does

Dev keeps a list of the tickets Brightline handled in a typical month. About a third were user problems that looked like network problems but were not: a laptop with Wi-Fi switched off, a printer out of paper that reported itself as offline. Another third were genuine local problems: a damaged patch cable, a switch port that had been disabled, an access point that needed to be restarted, a new device that had been given an address already in use. The rest were problems outside the building, such as an internet provider outage, an expired certificate on a cloud service, or a change at another site. Every one of those tickets started with a technician gathering facts and deciding which part of the network to look at first.

Technicians also spend much of their time on planned work. When Kettle & Crumb opened its third shop, someone had to choose its address range, order and label the cables, set up the switch and access point, connect the point-of-sale terminals, and update the network diagram. When Riverside Family Law moved two lawyers into a new office, someone had to patch their ports and confirm that the document-management system still worked. None of this is glamorous, and all of it depends on getting details right. A wrong subnet mask, an unlabeled cable or an out-of-date diagram turns a future five-minute repair into a two-hour search.

Good technicians write things down. Brightline's service desk lead, Marisol Tran, reminds everyone that a ticket is a record for the next person, not just for the current one. A good ticket note says what the user reported, what the technician checked, what was found, what was changed and how the fix was confirmed. Dev adds that the network diagram and the address plan are the same kind of record for the whole network, and that a technician who updates them after every change is worth two who do not.

Skills the exam expects

The CCST Networking exam is mostly about understanding. You will be asked to recognize which layer of a model a protocol belongs to, to identify a valid address for a host on a given subnet, to choose the right cable for a job, to match a port number to a service, and to interpret the output of common commands. Some questions describe a short scenario and ask what you would check next. The exam does not expect you to design an enterprise network or configure advanced routing protocols, but it does expect you to know what the parts of a small network do and how to read their settings.

Three skills appear throughout. First, you need a mental model of how data moves from one device to another: from an application, down through the layers, across cables and radio links, through switches and routers, and back up on the other side. Second, you need to work comfortably with addresses: MAC addresses on the local network, IPv4 addresses and masks, and IPv6 prefixes. Third, you need to know the physical side well enough to pick and check media. Lessons 2 to 11 build each of these, and lesson 12 brings them together in practice problems.

Building a study plan

Dev suggests a plan that fits around a full-time job. Work through one lesson of CSCO-111 each week, reading it twice: once quickly to get the shape and once slowly with a notebook. After each lesson, do the quiz without looking back, then explain any question you missed to someone else, or out loud to yourself. Practice subnetting a little every day rather than in long sessions; ten problems a day for three weeks builds more speed than one long weekend. When CSCO-111 is complete, move to CSCO-112, then spend the last two weeks on CSCO-190 and timed practice.

Hands-on practice matters even for an entry-level exam. Cisco offers a network simulator called Packet Tracer through its Networking Academy, which lets you build small networks of switches, routers and computers on your own laptop and see how traffic moves. Many technicians also keep an old switch and an access point at home. At Brightline, Dev keeps a lab rack with two small switches, a router and an access point, and Jordan is allowed to break it as often as necessary. You can also practice many skills in this course with the Python examples and exercises, which run in your browser.

By the end of October, Jordan has a notebook with a page for each exam domain and a sticky note on the monitor that says 'which layer?'. Dev says that is a good start. The next lesson begins with the models that make the question 'which layer?' meaningful.