Build Your Networking Foundation. Pass CCST Networking.
500 scenario-based practice questions covering networking standards, addressing and subnetting, endpoints and media, infrastructure, diagnostics, and security. Your launchpad toward CCNA.
No credit card required · Upgrade to 500 questions for $11.99
500 Exam-Style Questions
7-Day Money-Back Guarantee
Is this for you?
Your 100-150 exam is in the next 2–4 weeks
You've studied the concepts but aren't sure you'll pass
You want questions harder than the real exam
You want to understand why answers are correct, not just memorize
Not for you if:
You're looking for braindumps or exam leaks
You haven't started studying the concepts yet
The Cisco CCST Networking (100-150) is a foundational-level Cisco certification. The exam has 35 questions, runs 50 minutes, costs $125, and requires a passing score of ~70%. CertSharp provides 500 exam-style 100-150 practice questions — 30 free with no credit card — each with a detailed explanation.
Study guides teach concepts. We prepare you for the actual 100-150 exam.
1
Subnetting and addressing questions drill the math until it is automatic — the single biggest score lever
2
Every explanation ties protocols to real topologies so infrastructure and diagnostics questions click
3
Calibrated harder than the live exam: a steady 80% here predicts a comfortable CCST Networking pass
4
Updated for 2026 — current cabling, wireless, and IPv4/IPv6 addressing
Free Sample Questions
100-150 Practice Questions (Free Sample)
Real 100-150 exam-style questions from our 500-question Cisco CCST Networking bank, each with the correct answer and a detailed explanation.
Question 1 — 100-150
A technician needs to divide the 192.168.10.0/24 network into subnets that each support at least 50 usable hosts, using the fewest subnets possible. Which subnet mask should be used?
A
255.255.255.192 (/26)
B
255.255.255.224 (/27)
C
255.255.255.128 (/25)
D
255.255.255.240 (/28)
Correct answer: A — Explanation
A /26 mask (255.255.255.192) yields 2^6 − 2 = 62 usable hosts per subnet — the smallest subnet size that still meets the 50-host requirement, and it produces 4 subnets. A /25 (126 hosts) wastes addresses with only 2 subnets, while /27 (30 hosts) and /28 (14 hosts) are too small to fit 50 hosts.
Question 2Standards and ConceptsEasy
A support technician is mapping protocols to the OSI model. At which OSI layer does IP addressing and the routing of packets between networks operate?
A
The network layer (Layer 3)
B
The data link layer (Layer 2)
C
The transport layer (Layer 4)
D
The physical layer (Layer 1)
Show answer & explanation
Correct answer: A — The network layer (Layer 3)
Layer 3, the network layer, handles logical addressing with IP and forwards packets between different networks using routing. Layer 2 moves frames within a single local segment using MAC addresses, Layer 4 manages end-to-end transport with TCP or UDP, and Layer 1 defines physical signaling on the medium.
Question 3Standards and ConceptsMedium
A business keeps sensitive records in its own data center but bursts extra web capacity to a public cloud during peak sales. Which deployment model is this?
A
A hybrid cloud combining private and public
B
A purely public cloud deployment model
C
A purely private on-premises model
D
A community cloud shared by peer firms
Show answer & explanation
Correct answer: A — A hybrid cloud combining private and public
A hybrid cloud combines on-premises or private infrastructure with public cloud resources, letting sensitive workloads stay local while elastic demand bursts to the public cloud. A solely public or solely private model would not span both, and a community cloud is shared among related organizations.
Question 4Standards and ConceptsHard
A newly connected laptop receives an address in the 169.254.x.x range and cannot reach the network. Which service most likely did not respond?
A
The DNS resolver
B
The default gateway
C
The DHCP server
D
The NTP server
Show answer & explanation
Correct answer: C — The DHCP server
A 169.254.x.x APIPA address is self-assigned when a host fails to obtain a lease, indicating the DHCP server did not respond. DNS resolves names, the default gateway forwards off-subnet traffic, and NTP synchronizes time, but none of those assign the IP configuration.
Question 5Standards and ConceptsEasy
Data is encapsulated as it moves down the OSI model. What is the correct name for the protocol data unit (PDU) at the data link layer?
A
A packet
B
A frame
C
A segment
D
A bit
Show answer & explanation
Correct answer: B — A frame
At the data link layer the PDU is called a frame, which adds a header and trailer carrying source and destination MAC addresses. The network layer PDU is a packet, the transport layer PDU is a segment or datagram, and the physical layer transmits raw bits.
Question 6Standards and ConceptsMedium
A user reports that a login page shows a not secure warning and sends credentials in cleartext. Which change fixes the confidentiality problem?
A
Switch the site from TCP to UDP transport
B
Serve the page over HTTPS with a TLS certificate
C
Move the web server to a different LAN port
D
Increase the DHCP lease time for the clients
Show answer & explanation
Correct answer: B — Serve the page over HTTPS with a TLS certificate
Serving the page over HTTPS with a valid TLS certificate encrypts the session and removes the not secure warning. Changing transport to UDP, moving switch ports, or adjusting DHCP leases does not encrypt the web traffic.
Question 7Standards and ConceptsHard
A live voice call over the network tolerates occasional lost packets but cannot afford retransmission delays. Which transport protocol and reasoning fits best?
A
TCP, because it numbers and reorders bytes
B
TCP, because it opens a reliable session
C
FTP, because it streams media efficiently
D
UDP, because it avoids retransmission delay
Show answer & explanation
Correct answer: D — UDP, because it avoids retransmission delay
Real-time voice favors UDP because retransmitting a late packet is useless for a live conversation, and the low overhead minimizes delay. TCP reliability and reordering add latency that harms live audio, and FTP is a file transfer protocol rather than a real-time transport.
Question 8Standards and ConceptsEasy
Employees use a web-based email and office suite where the provider maintains the software entirely. Which cloud model is this?
A
IaaS, renting virtual machines
B
SaaS, a fully managed application
C
PaaS, a development platform
D
A self-hosted on-premises suite
Show answer & explanation
Correct answer: B — SaaS, a fully managed application
Software as a Service (SaaS) delivers a complete, provider-managed application accessed over the web, such as hosted email and office suites. IaaS provides raw infrastructure, PaaS provides a platform for building apps, and on-premises software is installed and maintained by the customer.
Question 9Standards and ConceptsMedium
At which OSI layer do port numbers identify the specific application or service that should receive the data?
A
The network layer
B
The data link layer
C
The transport layer
D
The session layer
Show answer & explanation
Correct answer: C — The transport layer
Port numbers operate at the transport layer (Layer 4), where TCP and UDP use them to direct traffic to the correct application. The network layer uses IP addresses, the data link layer uses MAC addresses, and the session layer manages dialog control rather than ports.
Question 10Standards and ConceptsHard
A file of 100 MB downloads in about 8 seconds. Approximately what average throughput does this represent, where 1 byte equals 8 bits?
A
About 12.5 Mbps on average
B
About 8 Mbps on average rate
C
About 800 Mbps on average
D
About 100 Mbps on average
Show answer & explanation
Correct answer: D — About 100 Mbps on average
A 100 MB file equals about 800 megabits (100 multiplied by 8), and dividing by 8 seconds yields roughly 100 Mbps of average throughput. The other values come from skipping the byte-to-bit conversion or dividing incorrectly.
Want more 100-150 practice questions?
Take the free 100-150 practice test: 30 questions per session with instant explanations. Unlock all 500 questions plus timed exam mode for $11.99 one-time.
Everything you need to know about Cisco CCST Networking
What is the Cisco CCST Networking exam?
The CCST Networking (100-150) is an entry-level Cisco certification covering networking standards, addressing and subnetting, infrastructure, endpoints, diagnostics, and security. The exam costs about $125 and runs 50 minutes.
Is CCST Networking worth it?
Yes. It is a recognized entry-level networking credential and a strong stepping stone to CCNA. It proves you understand core networking concepts, which is valuable for help desk, NOC, and junior network roles.
How hard is CCST Networking?
CCST Networking is entry-level but does require comfort with IP addressing and subnetting. Most candidates pass with 4–6 weeks of study. Subnetting practice is the area that most improves scores.
Should I take CCST Networking before CCNA?
It is a great on-ramp. CCST Networking covers the fundamentals CCNA assumes, so earning it first builds confidence and reduces the gap to the more advanced 200-301 exam.
How many questions are on CCST Networking?
Cisco does not publish a fixed count; expect roughly 35 questions in a 50-minute window, including multiple-choice and interactive question types.
What is the CCST Networking passing score?
Cisco does not publish an exact cut score for CCST exams. Aim for a consistent 80% on quality practice tests to be confident of passing.
How long does it take to prepare for CCST Networking?
Most candidates prepare in 4–6 weeks at about an hour a day. Prioritize subnetting, the OSI/TCP-IP models, common protocols, cabling and media, and basic troubleshooting.
What topics are on CCST Networking?
Key topics: networking standards and the OSI model, IPv4/IPv6 addressing and subnetting, cabling and media types, switches/routers/wireless infrastructure, network diagnostics, and security fundamentals.
What is the Cisco CCST Networking exam price for 2026?
The official 2026 CCST Networking (100-150) exam price is $125 USD, paid at booking through Cisco's Pearson VUE registration. Cisco has not announced a price change for 2026. Some regions add local tax at checkout.
Is there a Cisco CCST Networking practice test available?
Yes. CertSharp offers 500 scenario-based CCST Networking (100-150) practice questions covering addressing, subnetting, infrastructure, diagnostics, and security — 30 free with no credit card, full bank for a $11.99 one-time purchase. Each question includes a detailed explanation.
Also on CertSharp
Studying for a Different Certification?
Same 500-question depth, same calibrated difficulty.