Description
For learners studying for Cisco Certified Support Technician (CCST) Networking
What you'll learn
Practice pack content
Domain 1 - Standards and Concepts
Domain 2 – Addressing and Subnet Formats
Domain 3 – Endpoints and Media Types
Domain 4 – Infrastructure
Domain 5 – Diagnosing Problems
Domain 6 – Security
Final Exam Simulators
Exam Study Guide
Interactive Flashcards
Try 3 CCST Networking 100-150 practice questions
Choose an answer, explore the explanation, and see why the other options are less suitable. Three short scenarios. No sign-in required.
1. An address for a new printer
A technician must assign a static IPv4 address to a printer on the 192.168.20.64/26 subnet, whose gateway is 192.168.20.65. The administrator confirms that none of the listed addresses is already assigned to another device. Which address is a valid host address on this subnet?
Answer and full explanation
Correct answer: B — 192.168.20.94 is a usable address in this subnet.
Why B is correct
A /26 prefix leaves six bits for host addresses, creating blocks of 64 addresses. This subnet runs from 192.168.20.64 through 192.168.20.127. The first address identifies the network, and the last is its broadcast address. The usable host range is therefore 192.168.20.65 through 192.168.20.126. Address 192.168.20.94 falls inside that range and, as stated, is not assigned to another device.
Why the other options are less suitable
- A — 192.168.20.64: This address identifies the /26 subnet because its host bits are all zero. It is not an assignable host address in this subnet.
- C — 192.168.20.127: This is the subnet’s broadcast address because its host bits are all one. It represents a broadcast to the subnet rather than an individual printer.
- D — 192.168.20.129: This is a usable host address in the next subnet, 192.168.20.128/26. It is outside the subnet specified for the printer.
Key takeaway: Use the prefix to identify the subnet boundaries, then exclude the network and broadcast addresses from ordinary host assignments.
Read two more sample questions
2. A frame with a known destination
A technician reviews a Layer 2 switch on a small office LAN. A valid unicast frame arrives on port 2, and the MAC address table places its destination on port 5 in the same VLAN; both ports are forwarding normally. What should the switch do with this frame?
Answer and full explanation
Correct answer: D — Forward the frame through port 5.
Why D is correct
A Layer 2 switch uses the destination MAC address to decide where to forward a frame. The existing table entry identifies port 5 as the path to that destination within this VLAN. Because port 5 differs from the incoming port, the switch forwards the frame through port 5. Flooding is unnecessary when a valid destination entry is already available. No IP routing decision is needed for this local Layer 2 forwarding action.
Why the other options are less suitable
- A — Flood within the VLAN: A switch normally floods an unknown unicast frame to other forwarding ports in the same VLAN. Here, the destination is known, so that wider distribution is unnecessary.
- B — Send to the default gateway: A gateway is relevant when a host needs to reach a different IP network. This frame already identifies a destination reachable through port 5 in the same VLAN.
- C — Drop a known destination: A switch can filter a frame when its destination is reachable through the same port on which it arrived. The incoming port is 2 and the destination port is 5, so that condition does not apply.
Key takeaway: A known unicast destination is forwarded to its mapped port; an unknown destination normally requires flooding within the VLAN.
3. Reachable by address, not by name
A Windows laptop successfully pings a printer at 192.168.10.80, but pinging printer.example.com returns a message that the host cannot be found. The technician wants to query the configured DNS server for that name before changing any settings. Which command most directly performs that check?
Answer and full explanation
Correct answer: A — Use nslookup to query name resolution.
Why A is correct
The nslookup command queries DNS for information about a supplied name. Without a separate server argument, it uses the default DNS server. The successful IP ping confirms that the printer answered an IP-level connectivity test, while the hostname error points toward a name-resolution problem. The lookup result can show a returned address or an error that guides the next investigation step. This checks the stated requirement without changing the laptop’s configuration.
Why the other options are less suitable
- B — Display network settings: The
ipconfig /allcommand is useful for reviewing the laptop’s full TCP/IP configuration. It does not ask the DNS server to resolve the printer’s name. - C — Trace the IP path: The
tracertcommand helps investigate the route toward an IP destination. This command targets the numeric address rather than testing resolution ofprinter.example.com. - D — Repeat the IP ping: Another ping could help check whether IP connectivity remains consistent. It repeats the test that already succeeded without querying the printer’s hostname.
Key takeaway: Separate IP reachability from name resolution, and use a DNS query to investigate a hostname lookup problem.
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Requirements
- Basic computer use and familiarity with IP addressing, Ethernet and Wi-Fi help with these scenarios. Cisco lists no formal certification prerequisites, but expects candidates to understand the exam topics.
- Combine question practice with foundational networking study and your own authorized exercises, such as checking interface settings, testing connectivity and interpreting command output. Revisit unfamiliar concepts before repeating practice questions.
- You will need an internet-connected device, a current web browser and an ExamsDigest account to access this online practice product.
Know the exam you’re studying for
These details describe Cisco’s official Cisco Certified Support Technician (CCST) Networking 100-150 exam.
What our students say
“Subnetting was the topic I kept getting stuck on while studying for CCST Networking 100-150. Working through the questions and reviewing my mistakes helped me understand the difference between network, broadcast and usable host addresses.”
Ethan Parker
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“I liked having explanations for the incorrect answers, too. Sometimes I picked the right answer for the wrong reason, and reading the explanation helped me catch that instead of moving on without understanding.”
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“I used ExamsDigest alongside my networking course. The troubleshooting scenarios helped me recognize when to check IP settings, test connectivity or investigate DNS. They also gave me specific topics to revisit in my notes.”
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Your questions, answered.
Which exam do these practice questions target?
These practice questions target Cisco Certified Support Technician (CCST) Networking, exam 100-150. Check that code against your planned booking before purchasing. Review the product’s listed topics, included resources and access terms against your needs. CCST Networking is distinct from CCST IT Support, CCST Cybersecurity and CCNA, so practice for another Cisco exam should not be treated as interchangeable.
Is CCST Networking suitable for beginners?
Yes. CCST Networking addresses entry-level concepts, making this practice relevant to networking students, career changers and junior support technicians. Cisco lists no formal certification prerequisites, but expects an understanding of the exam topics. Basic computer use, IP addressing, Ethernet and Wi-Fi knowledge will help you follow the scenarios. Learners who are new to these topics should study the foundations alongside question practice.
How should I combine questions with practical study?
Combine questions with foundational networking study and exercises on devices or test networks you are authorized to use. Useful activities include checking IP settings, testing connectivity, tracing a route, reviewing switch information and capturing your own network traffic. After an exercise, explain what the output means and what you would check next. These study suggestions do not imply that equipment, labs or simulation software are included in the pack.
What should I do after choosing an incorrect answer?
Use an incorrect answer to identify the concept or decision you misunderstood. Record whether the issue involved subnet boundaries, protocol roles, command output or a missed requirement in the scenario. Review the explanation, compare the other choices, then revisit that topic before attempting a different question. Focus on explaining why an answer fits; memorizing a letter or reaching a particular practice score does not establish that you will pass the official exam.
Does this preview reproduce the official exam format?
No. This preview contains three questions with four choices and one correct answer each. It does not reproduce the official 100-150 testing interface or establish every question type used on the exam. Consult the exam provider’s tutorial or CCST Networking test drive for its interface, and check the paid product’s description separately for the practice formats it includes.
Does completing the practice award the Cisco certification?
No. Purchasing or completing practice questions does not award a Cisco certification. Earning CCST Networking requires passing the official 100-150 exam and meeting Cisco’s applicable candidate rules and agreements. Arrange your official exam through an authorized delivery route, and check the product’s stated terms for any voucher arrangements. Do not assume an exam booking is included simply because a practice product uses the certification name.
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