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Free Practice Questions for Craftsman Information Device Operation

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Key Facts: Craftsman Information Device Operation Exam

60 items

Written CBT examination length

Q-Net Craftsman testing standards

60 minutes

Written examination time limit

Q-Net Craftsman testing standards

60 / 100

Passing score threshold (36 of 60 correct)

Q-Net 검정기준 및 방법 (기능사)

KRW 14,500

Written registration fee

Q-Net crf005 jmCd=0480, checked 2026

KRW 21,800

Practical registration fee

Q-Net crf005 jmCd=0480, checked 2026

2 years

Written pass exemption validity

National Technical Qualifications Act Enforcement Decree Article 21

정보기기운용기능사 is HRD Korea's Craftsman qualification for network and information device operation. The written paper consists of 60 CBT multiple-choice questions across 3 subjects (Network Configuration 33%, Device Maintenance 33%, and Device Installation and Operation 34%) with a 60/100 passing threshold. The practical exam is a 1.5-hour hands-on network device configuration test. Official fees are KRW 14,500 written and KRW 21,800 practical. OpenExamPrep offers independent English study questions, not an official test.

Sample Craftsman Information Device Operation Practice Questions

Try these sample questions to review concepts for the Craftsman Information Device Operation exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which network physical topology connects all client nodes directly to a central networking device, such as a multiport switch or hub (성형 토폴로지)?
A.Bus topology (버스 토폴로지)
B.Star topology (성형 토폴로지)
C.Ring topology (링 토폴로지)
D.Mesh topology (망형 토폴로지)
Explanation: In a star topology (성형 토폴로지 / 성형 망), every workstation or endpoint is connected via an individual point-to-point cable to a central concentrator, such as a switch or hub. If a single workstation cable is severed, only that endpoint loses connectivity while the rest of the local network continues operating normally. This makes star topology the dominant deployment architecture in modern Ethernet LANs.
2In a classic coaxial bus topology (버스 토폴로지), what component must be installed at both ends of the shared backbone cable to absorb propagating electrical signals?
A.Bridge (브리지)
B.Repeater (리피터)
C.Terminating resistor (종단저항 / 터미네이터)
D.Transceiver (트랜시버)
Explanation: Bus topologies require a terminating resistor (종단저항, typically 50 ohms in 10BASE2 thinnet coax) attached to both physical cable ends. The terminator absorbs electrical wave energy traveling along the transmission line to prevent signal reflection (신호 반사). Without proper termination, reflected electromagnetic waves collide with legitimate signals, causing severe packet corruption.
3Which channel access control method is traditionally utilized in an IEEE 802.5 Token Ring network (링 토폴로지)?
A.Token passing (토큰 패싱)
B.CSMA/CD (반송파 감지 다중 접속 및 충돌 검출)
C.CSMA/CA (반송파 감지 다중 접속 및 충돌 회피)
D.Polling (폴링)
Explanation: Token Ring (IEEE 802.5) utilizes deterministic token passing (토큰 패싱), where a special small control frame called a 'token' circulates unidirectionally around the ring. Only the node currently possessing the token is permitted to transmit data frames onto the medium. Because only one token exists on the ring, packet collisions cannot occur in token passing.
4In a full mesh topology (완전 망형 토폴로지) consisting of 8 networking routers, how many dedicated physical communication links are required to connect all routers directly to one another?
A.8 links
B.16 links
C.24 links
D.28 links
Explanation: The formula for the total number of physical transmission links in a fully interconnected mesh network of N nodes is N × (N - 1) / 2. For 8 routers, the calculation is 8 × (8 - 1) / 2 = 8 × 7 / 2 = 28 dedicated links. Full mesh topologies offer maximum fault tolerance and zero routing contention, but become cost-prohibitive as node counts grow.
5Which of the following correctly lists Layers 1 through 4 of the ISO/OSI 7-Layer Reference Model (OSI 7계층) in ascending order from bottom to top?
A.Data Link → Physical → Transport → Network
B.Physical → Data Link → Network → Transport
C.Physical → Network → Data Link → Transport
D.Data Link → Network → Transport → Session
Explanation: The OSI 7-layer model is organized from Layer 1 to Layer 7 as follows: Physical (1, 물리 계층), Data Link (2, 데이터 링크 계층), Network (3, 네트워크 계층), Transport (4, 전송 계층), Session (5, 세션 계층), Presentation (6, 표현 계층), and Application (7, 응용 계층). Physical deals with bit transmission over the medium, Data Link handles framing and MAC addressing, Network handles IP addressing and path selection, and Transport manages host-to-host segment delivery.
6What is the Protocol Data Unit (PDU) at the OSI Data Link Layer (데이터 링크 계층), and what mechanism does it use to detect transmission errors?
A.Frame (프레임) using Frame Check Sequence (FCS / CRC)
B.Packet (패킷) using IP header checksum
C.Segment (세그먼트) using TCP checksum
D.Bit (비트) using Manchester encoding
Explanation: At the Data Link Layer (Layer 2), data is packaged into structured units called Frames (프레임). Ethernet frames append a 4-byte Frame Check Sequence (FCS) trailer calculated using a 32-bit Cyclic Redundancy Check (CRC-32) algorithm, enabling the receiving network interface card to detect bit corruptions introduced across the physical wire.
7Which layer of the OSI model is responsible for logical addressing (논리적 주소 지정) and selecting the optimal path across interconnected networks (경로 배정 / 라우팅)?
A.Data Link Layer (데이터 링크 계층)
B.Transport Layer (전송 계층)
C.Network Layer (네트워크 계층)
D.Session Layer (세션 계층)
Explanation: The Network Layer (Layer 3, 네트워크 계층) provides logical device addressing (such as IPv4 and IPv6 addresses) and route determination (라우팅). Routers operate primarily at Layer 3 to inspect destination network addresses in incoming packet headers and look up routing tables to forward packets toward destination subnets.
8Which protocol comparison accurately distinguishes Transmission Control Protocol (TCP) from User Datagram Protocol (UDP) at the Transport Layer?
A.TCP is connectionless and has low header overhead; UDP establishes virtual circuits with three-way handshakes
B.TCP uses 8-byte headers and supports multicasting; UDP uses 20-byte headers and guarantees packet arrival
C.TCP cannot perform flow control or windowing; UDP regulates sender transmission rates using sliding windows
D.TCP is connection-oriented and guarantees reliable in-order delivery; UDP is connectionless with low overhead and no delivery guarantee
Explanation: TCP (전송 제어 프로토콜) is a connection-oriented protocol that establishes a session via a three-way handshake (SYN, SYN-ACK, ACK), provides reliable packet delivery through sequence numbering and acknowledgments, and performs flow control with sliding windows. Conversely, UDP (사용자 데이터그램 프로토콜) is connectionless, adds only an 8-byte header, does not retransmit lost packets, and prioritizes low latency for real-time applications like VoIP, DNS, and video streaming.
9In legacy half-duplex Ethernet networks (IEEE 802.3), what action do transmitting stations take immediately upon detecting a data collision via CSMA/CD?
A.Switch to token passing mode and resume immediate packet transmission
B.Transmit a 32-bit jam signal (잼 신호) and execute a random backoff algorithm (백오프 알고리즘)
C.Permanently disconnect the network adapter until the workstation restarts
D.Send an ICMP Source Quench message to the default gateway router
Explanation: Under CSMA/CD (Carrier Sense Multiple Access with Collision Detection / 반송파 감지 다중 접속 및 충돌 검출), when a station detects an electrical voltage spike indicating a collision while transmitting, it immediately sends a 32-bit jam signal to ensure all other stations on the shared medium detect the collision. All colliding stations then abort transmission and wait a pseudo-random time period determined by the truncated binary exponential backoff algorithm before attempting to retransmit.
10Why does IEEE 802.11 wireless networking utilize CSMA/CA (충돌 회피) rather than the CSMA/CD (충돌 검출) scheme used in wired Ethernet?
A.Wireless antennas cannot transmit digital pulses and can only process analog telephone voice signals
B.Wireless routers do not maintain MAC address tables and cannot forward unicast data frames
C.Wireless transceivers cannot reliably detect inbound collisions while simultaneously transmitting RF energy on the same channel
D.Wireless frames are limited to 64 bytes and cannot include Frame Check Sequence trailers
Explanation: In wireless RF communications, the radio energy transmitted by a local antenna overwhelmingly drowns out any weak incoming radio signals from distant stations on the same frequency band. Consequently, a wireless transceiver cannot listen for collisions while actively transmitting. Wireless LANs therefore use CSMA/CA (Collision Avoidance / 반송파 감지 다중 접속 및 충돌 회피), employing inter-frame spaces (DIFS/SIFS), random backoffs, and optional RTS/CTS (Request to Send / Clear to Send) handshake frames to avoid collisions beforehand.

About the Craftsman Information Device Operation Exam

Craftsman Information Device Operation (정보기기운용기능사) is South Korea's national technical qualification administered by HRD Korea under the Ministry of Science and ICT. It tests foundational competencies in local area networking, IP addressing and subnetting, hardware diagnostics, BIOS/UEFI, peripheral interfaces, OS installation and administration, and Cisco-style router/switch CLI configuration. Passing the written exam requires 60/100 points across 60 multiple-choice questions, followed by a 1.5-hour hands-on practical exam in 네트워크 운용 실무. This study bank provides independent English-language MCQ practice covering these core exam domains; it is not an official translation or hands-on router/switch simulation.

Exam sponsor: HRD Korea (Q-Net). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

Written paper covering Network Configuration (네트워크 구성), Device Maintenance (정보기기 유지보수), and Device Installation & Operation (정보기기 설치운영), 60 items total in 60 minutes. Candidates scoring 60/100 or higher advance to the 1.5-hour hands-on practical in 네트워크 운용 실무.

Time Limit

60 minutes written; 1.5 hours practical

Passing Score

Written: 60/100; practical: 60/100

Exam / Certification Fees

KRW 14,500 written / KRW 21,800 practical (Q-Net, 2026)

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Official sources

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

33%

Network Configuration (네트워크 구성)

LAN topologies, Ethernet and Wi-Fi standards, OSI 7-layer architecture, IP addressing, subnet masking, cabling types, and switching/routing fundamentals.

33%

Device Maintenance (정보기기 유지보수)

Computer architecture, CPU/RAM/storage subsystems, BIOS/UEFI firmware setup, peripheral interfaces (USB, HDMI, DP), and system diagnostics and troubleshooting commands.

34%

Device Installation and Operation (정보기기 설치운영)

Operating system deployment and administration, disk partitioning, Cisco-style router and switch CLI commands, user security, ACLs, and power protection/backup.

Preparing for the Craftsman Information Device Operation Exam

What You Need to Know

  • Passing score: Written: 60/100; practical: 60/100
  • Assessment: Written paper covering Network Configuration (네트워크 구성), Device Maintenance (정보기기 유지보수), and Device Installation & Operation (정보기기 설치운영), 60 items total in 60 minutes. Candidates scoring 60/100 or higher advance to the 1.5-hour hands-on practical in 네트워크 운용 실무.
  • Time limit: 60 minutes written; 1.5 hours practical
  • Exam / certification fees: KRW 14,500 written / KRW 21,800 practical (Q-Net, 2026) Official sources

Using Our Practice Resources

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

Craftsman Information Device Operation: Suggested Study Strategy

1Master binary-to-decimal conversion and subnet calculations, including identifying network IDs, broadcast addresses, and usable host counts for given CIDR prefixes.
2Memorize standard cabling pinouts (TIA/EIA-568A vs. 568B) and know when to apply straight-through, crossover, or console rollover cables.
3Practice Cisco IOS command hierarchy (user EXEC, privileged EXEC, global configuration, and interface mode) and standard configuration commands like 'ip address', 'no shutdown', and 'ip route'.
4Review common hardware diagnostic commands (ping, ipconfig, tracert, netstat, arp) and motherboard POST beep patterns for rapid troubleshooting.

Frequently Asked Questions

What is Craftsman Information Device Operation (정보기기운용기능사)?

It is a national technical qualification certified by HRD Korea under the Ministry of Science and ICT. It validates technical skills in configuring local area networks, installing and maintaining PC hardware and operating systems, and setting up network devices such as switches and routers.

How is the official exam structured in 2026?

The written exam consists of 60 four-option multiple-choice CBT questions completed in 60 minutes. Scoring 60 or higher out of 100 (at least 36 correct answers) constitutes a pass with no subject-level elimination (과락). Passing the written test qualifies candidates for the 1.5-hour hands-on practical exam in 네트워크 운용 실무.

What does the practical examination (실기시험) involve?

The practical exam tests hands-on router and switch configuration using network simulation software (such as Cisco Packet Tracer) or physical hardware, alongside UTP cable termination and basic workstation network parameter setup. Candidates execute IOS commands to configure interfaces, VLANs, static routes, and access lists.

What are the examination fees and retake rules?

As verified on Q-Net for 2026, the written examination fee is KRW 14,500 and the practical examination fee is KRW 21,800. Under Article 21 of the National Technical Qualifications Act Enforcement Decree, candidates who pass the written exam are exempt from retaking it for 2 years.

Is this practice bank an official test or simulation?

No. This question bank is an independent English-language multiple-choice study adaptation designed to drill theoretical concepts, technical terminology, and CLI syntax. It is not an official HRD Korea exam paper, nor does it replace the hands-on practical router/switch configuration exam.