Free 100-150: Cisco Certified Support Technician (CCST) Networking Exam Questions and Answers
Cisco Certified Support Technician (CCST) Networking is exam 100-150, part of Cisco certifications. In Cisco's current scheme the first digit gives the level: 100 is entry, 200 associate, 300 the CCNP concentration exams, 350 the CCNP core exams that also qualify you for CCIE, 500 specialist and 700 the unproctored sales exams. Older codes such as 400-, 640- and 642- predate the February 2020 restructure, when every CCNA track was collapsed into one exam and CCNP moved to a core-plus-concentration model.
Looking for 100-150 exam dumps or ExamTopics 100-150 questions? These 100-150 practice questions cover the same ground with verified answers and explanations, a downloadable 100-150 PDF and a full 100-150 practice test, kept current as Cisco updates the exam.
Last updated: November 4, 2026
- Exam code
- 100-150
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- Cisco
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- 1000+
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- First 10, with answers
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- 130 mins · 70%
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Question #1
A technician is asked to measure the throughput of the 1 Gbps link between two switches in different wiring closets. The result must not be affected by the company's internet connection. What should the technician do?
Correct answer: D
Explanation
Iperf generates traffic between two hosts you control, so it measures actual throughput across just the internal link. A web-based speed test measures the path to an internet server and so includes the WAN. Ping and tracert report delay (latency), not throughput.
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Question #2
A user's Windows laptop shows a connection to the office Wi-Fi network but cannot reach any resources. The technician runs ipconfig and sees the following output. Exhibit: Wireless LAN adapter Wi-Fi: Connection-specific DNS Suffix . : Autoconfiguration IPv4 Address. . : 169.254.37.112 Subnet Mask . . . . . . . . . . . : 255.255.0.0 Default Gateway . . . . . . . . . : Which two conclusions are supported by this output? (Choose two.)
Select 2 answers.
Correct answer: B, D
Explanation
An address in 169.254.0.0/16 labeled Autoconfiguration means Windows assigned itself a link-local address after getting no DHCP response. That address has no default gateway, so only hosts on the same link can be reached. The gateway field is blank because none was ever configured or leased, not because it was mistyped, and nothing in the output points to DNS.
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Question #3
What is the purpose of a packet analyzer such as Wireshark?
Correct answer: B
Explanation
A packet analyzer captures traffic on an interface and decodes it so a technician can inspect headers and payloads, and the capture can be saved to a .pcap file. Blocking traffic is a firewall function, bandwidth measurement is done with tools such as Iperf, and address translation is done by NAT on a router or firewall.
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Question #4
A network printer fails to obtain an IP address. A technician captures traffic with Wireshark on a laptop plugged into the same VLAN, power-cycles the printer, and sees the following packets. Exhibit: No. Time Source Destination Protocol Info 1 0.000 0.0.0.0 255.255.255.255 DHCP DHCP Discover - Transaction ID 0x3a1f5c20 2 4.012 0.0.0.0 255.255.255.255 DHCP DHCP Discover - Transaction ID 0x7be20914 3 12.031 0.0.0.0 255.255.255.255 DHCP DHCP Discover - Transaction ID 0x1c88d6a7 No DHCP Offer packets appear in the capture. Which conclusion does the capture support?
Correct answer: A
Explanation
The printer repeats DHCP Discover broadcasts with new transaction IDs and nothing replies, so the problem is on the server side: the server is down, unreachable on this VLAN, or has no helper path. A rejected or conflicting address would show Offer, Request or Decline packets, and DNS is not used until the printer has an address.
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Question #5
Which wireless security mode uses Simultaneous Authentication of Equals (SAE) to protect a passphrase against offline dictionary attacks?
Correct answer: D
Explanation
WPA3-Personal replaces the WPA2 pre-shared key handshake with SAE, so a captured handshake cannot be used to guess the passphrase offline. WPA2-Personal and WPA-Personal use the PSK handshake, and WPA2-Enterprise authenticates users through 802.1X and a RADIUS server rather than a shared passphrase.
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Question #6
An unauthorized user gains access to a payroll file and changes several salary values. Which part of the CIA triad is directly violated?
Correct answer: A
Explanation
Integrity means data stays accurate and is changed only by authorized parties, so unauthorized modification violates it. Confidentiality would be violated if the file were only read, and availability if it could not be accessed. Non-repudiation is not one of the three CIA elements.
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Question #7
How does a Layer 2 switch build its MAC address table?
Correct answer: B
Explanation
A switch learns by examining the source MAC address of every frame it receives and associating it with the ingress port. The destination address is used only to look up where to forward the frame. Switches do not poll devices with ARP at startup, and DHCP does not hold MAC tables.
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Question #8
A technician is reviewing a list of IPv4 addresses that a contractor proposed for hosts on a new branch office LAN. Which two of the addresses are private addresses that can be used behind a NAT router? (Choose two.)
Select 2 answers.
Correct answer: A, B
Explanation
RFC 1918 reserves 10.0.0.0/8, 172.16.0.0/12 (172.16.0.0 through 172.31.255.255) and 192.168.0.0/16 for private use. 10.255.0.9 and 172.31.200.14 fall inside those ranges. The trap is that 172.32.4.20 and 192.169.1.5 look close to private ranges but sit just outside them, so they are public addresses.
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Question #9
A workstation is configured with the IP address 192.168.10.77/27. What is the broadcast address of the subnet to which this workstation belongs?
Correct answer: B
Explanation
A /27 uses 5 host bits, so the subnets increment by 32 in the last octet: 0, 32, 64, 96. The address .77 falls in the 192.168.10.64 subnet, which runs from .64 to .95. The broadcast address is the last address, 192.168.10.95. 192.168.10.64 is the network address.
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Question #10
Several employees receive an email that appears to come from the IT department. The message says their mailboxes will be disabled unless they click a link and sign in with their network username and password. The link opens a page that is not hosted by the company. Which type of threat does this email represent?
Correct answer: C
Explanation
Phishing uses a message that impersonates a trusted sender to trick users into revealing credentials. Spam is unwanted bulk email and does not by itself try to steal credentials, which is the tempting wrong answer here. Nothing in the message floods a service or installs software, so denial of service and malware do not fit.
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Discussion
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FAQ
Learn More: https://www.cisco.com/site/us/en/learn/training-certifications/certifications/index.html
- Q1: What is the 100-150: Cisco Certified Support Technician (CCST) Networking exam?
- A: 100-150: Cisco Certified Support Technician (CCST) Networking is a Cisco certification exam. Judging by the questions in our bank, it concentrates on vlan2, switch1, partial, switch and credit.
- Q2: What topics does the 100-150: Cisco Certified Support Technician (CCST) Networking exam cover?
- A: Questions in our 100-150: Cisco Certified Support Technician (CCST) Networking bank cluster around vlan2, switch1, partial, switch, credit, ticket, selection and port. Working through the full set is the quickest way to find which of these you are weakest on.
- Q3: How should I prepare for 100-150: Cisco Certified Support Technician (CCST) Networking?
- A: Work through the 100-150: Cisco Certified Support Technician (CCST) Networking practice questions here, checking your answer on each one, then sit the practice test to rehearse the exam under timed conditions before the real thing.
- Q4: Are these real 100-150: Cisco Certified Support Technician (CCST) Networking exam questions?
- A: They are drawn from officially released past questions and from community members who have sat 100-150: Cisco Certified Support Technician (CCST) Networking. Answers are verified and updated weekly.
- Q5: Where do I register for the 100-150: Cisco Certified Support Technician (CCST) Networking exam?
- A: Register through Cisco directly. Exampractice is not affiliated with Cisco and does not administer the exam.
- Q6: Is there a free 100-150: Cisco Certified Support Technician (CCST) Networking sample?
- A: Yes. Every 100-150: Cisco Certified Support Technician (CCST) Networking page shows a free sample of real questions. Upgrading opens the full bank and the practice test.
- Q7: What are Cisco Certification Exams?
- A: Cisco Certification Exams validate your expertise in using and managing Cisco networking and IT solutions. These certifications demonstrate your proficiency in designing, implementing, and troubleshooting Cisco-based networks and systems, covering areas such as routing and switching, security, wireless, data center, and collaboration.
- Q8: Why should I pursue Cisco Certification?
- A: Cisco Certification enhances your professional credibility, showcasing your skills and knowledge in Cisco technologies. This can lead to better job opportunities, higher salaries, and career advancement in networking and IT industries.
- Q9: What are the benefits of Cisco Certification?
- A: Benefits include recognition as a certified networking professional, improved job performance, access to exclusive resources, continuing education opportunities, and staying current with the latest Cisco technologies and best practices.
- Q10: Who should take Cisco Certification Exams?
- A: Network engineers, system administrators, IT professionals, and anyone involved in designing, implementing, and managing network solutions using Cisco products should consider these certifications to validate their expertise and advance their careers.
- Q11: What types of Cisco Certification Exams are available?
- A: Cisco offers various certification paths, including:
- Q12: How do I prepare for Cisco Certification Exams?
- A: Preparation can include official Cisco training courses, study guides, practice exams, online tutorials, and hands-on experience with Cisco networking equipment and solutions.
- Q13: Where can I take Cisco Certification Exams?
- A: Cisco Certification Exams can be taken at authorized Pearson VUE testing centers worldwide or online, providing flexibility to fit your schedule and location.
- Q14: How do Cisco Certifications impact my career?
- A: Cisco Certifications significantly boost your career by demonstrating your expertise to employers, making you a more competitive candidate for advanced roles and promotions in networking and IT.
- Q15: Are there any prerequisites for Cisco Certification Exams?
- A: Some exams may have prerequisites, such as foundational knowledge or prior certifications. Check the specific requirements for each certification path on the Cisco website.
- Q16: How often do I need to recertify for Cisco Certifications?
- A: Cisco Certifications typically require recertification every three years to ensure that certified professionals stay updated with the latest networking technologies and industry practices.