Network Cabling EXAM 2025 | ALL CURRENT EXAM VERSIONS 2025 | ACCURATE REAL EXAM QUESTIONS AND ANSWERS | ACCURATE AND VERIFIED FOR GUARANTEED PASS | GRADED A

What does the IEEE 802.3af standard define? A. High-speed fiber optic transmissions B. Gigabit Ethernet over coax C. Power over Ethernet (PoE) using Cat 3 cables D. Supplying power over Ethernet using Cat 5 or better cables Correct answer: D Rationale: IEEE 802.3af defines PoE, delivering up to 15.4 watts of power using Cat 5 or better Ethernet cables. What improvement does IEEE 802.3at (PoE+) provide over 802.3af? A. Faster data transmission B. Increased power delivery up to 25.5 watts C. Lower cable resistance D. Support for coaxial cabling Correct answer: B Rationale: 802.3at, or PoE+, delivers more power than 802.3af—up to 25.5 watts for devices needing higher power. What is Alien Crosstalk? A. Data loss from corrupted packets B. Electromagnetic interference from a nearby cable C. Ground loop interference D. Incorrect pinout wiring Correct answer: B Rationale: Alien crosstalk occurs when interference from signals on adjacent cables induces noise. What feature characterizes an APC (Angle Polished Connector)? A. Straight flat polish on the connector tip B. Ferrule polished for multimode only C. End faces are polished at an angle to reduce reflection D. Magnetic end connector for easy plug Correct answer: C Rationale: APC connectors reduce back-reflection by polishing the ferrules at an angle. What does attenuation in networking refer to? A. Electromagnetic interference B. Signal loss over distance C. Overvoltage protection D. Packet collisions Correct answer: B Rationale: Attenuation is the weakening of a signal as it travels from source to destination. What does bandwidth represent in a network? A. Voltage levels on the cable B. Signal loss measurement C. Amount of data transferred over time D. Number of devices connected Correct answer: C Rationale: Bandwidth is the data capacity of a network over a set time frame, typically measured in Mbps or Gbps. What is the function of a BiDi transceiver? A. Convert analog to digital B. Encrypt transmission C. Support bidirectional data on a single fiber D. Detect cable breaks Correct answer: C Rationale: BiDi transceivers allow simultaneous send/receive operations on the same fiber port. What does bidirectional mean in fiber-optic communication? A. Data only moves one direction B. Power and data share the same wire C. Data flows in both directions on the same cable D. Uses two cables per signal Correct answer: C Rationale: Bidirectional transmission enables simultaneous communication in both directions. What is bit rate? A. Size of a network segment B. Number of bits transferred per second C. Number of ports on a switch D. Signal strength in dBm Correct answer: B Rationale: Bit rate is a measure of data transmission speed, expressed in bits per second (bps). What type of connector uses a turn-and-lock style on coaxial cable? A. BNC connector B. RJ-45 C. F-type D. SC connector Correct answer: A Rationale: BNC connectors use a bayonet (turn-and-lock) coupling for secure coaxial connections. What tool measures cable characteristics like attenuation, crosstalk, and impedance? A. Cable performance tester B. Wire stripper C. Punch-down tool D. Optical meter Correct answer: A Rationale: A cable performance tester is designed for diagnosing multiple cable integrity issues. What does a basic cable tester check for? A. Fiber alignment B. Continuity, length, faults, attenuation, and impedance C. Power overloads D. Packet transmission speeds Correct answer: B Rationale: Cable testers detect various physical and signal problems in a cable. What is Cat 3 cabling typically rated for? A. 1 Gbps B. 100 Mbps C. 10 Mbps and 16 MHz D. Fiber connections Correct answer: C Rationale: Cat 3 is outdated and supports up to 10 Mbps throughput and 16 MHz bandwidth. What is the throughput limit for Cat 5 UTP cable? A. 100 Mbps B. 10 Mbps C. 1 Gbps D. 2.5 Gbps Correct answer: A Rationale: Cat 5 supports 100 Mbps speed and a 100 MHz signal rate. What improvement does Cat 5e offer over Cat 5? A. Greater length B. Higher signal rate up to 350 MHz and 1 Gbps C. Optical transmission D. Fiber shielding Correct answer: B Rationale: Cat 5e enhances Cat 5 by reducing crosstalk and increasing speed to 1 Gbps. What makes Cat 6 different from earlier twisted-pair cables? A. Larger cable diameter B. Foil insulation and support for 250 MHz C. Optical fiber core D. Single wire per pair Correct answer: B Rationale: Cat 6 has foil-wrapped wire pairs and better insulation to support faster transmission rates. What does Cat 6a offer compared to Cat 6? A. Less insulation B. Lower speeds C. Improved crosstalk reduction and support for longer distances D. Support for analog signals Correct answer: C Rationale: Cat 6a enhances Cat 6 with better performance over longer cable lengths. What is a key feature of Cat 7 cable? A. Fiber-optic core B. No shielding C. Only two wire pairs D. Each pair shielded plus outer shield for 1 GHz support Correct answer: D Rationale: Cat 7 uses extensive shielding to support up to 1 GHz signal rate. What is a feature of Cat 7a compared to Cat 7? A. Lower signal quality B. No shielding C. Higher potential throughput up to 100 Gbps D. Uses coaxial cable Correct answer: C Rationale: Cat 7a increases signal rate and potential throughput over Cat 7. What is the cladding in fiber-optic cables? A. Conductive metal B. Glass/plastic layer that reflects light back to the core C. Outer protective jacket D. Signal generator Correct answer: B Rationale: Cladding maintains signal integrity by reflecting light within the fiber. What is coaxial cable primarily used for today? A. Ethernet backbones B. Cable Internet and TV systems C. Fiber-optic backhaul D. Telephone lines Correct answer: B Rationale: Coaxial cable is commonly used for broadband and television signal transmission. What is a console port used for on a router? A. Internet access B. Configuration and management of the router C. Power input D. Connecting to a modem Correct answer: B Rationale: A console port is used to configure or manage a router directly via terminal access. What does continuity in a cable indicate? A. The length of the cable B. Shielding effectiveness C. That a signal can travel from one end to the other D. Crosstalk levels Correct answer: C Rationale: Continuity ensures the cable’s internal wiring is intact for signal transmission. What does a continuity tester check? A. Cable color code B. Signal presence from one cable end to another C. Packet loss D. Ethernet speeds Correct answer: B Rationale: It verifies whether a signal or voltage/light reaches the opposite cable end. What is the core of a cable? A. Protective jacket B. Shielding material C. The central conductor that carries the signal D. Outer grounding ring Correct answer: C Rationale: The core is the main component that transmits electrical or optical signals. What is the function of a crimper tool? A. Attaches connectors like RJ-45 to cables B. Measures current C. Cuts insulation D. Tests bandwidth Correct answer: A Rationale: Crimpers are used to secure connectors to the ends of twisted-pair cables. What defines a crossover cable? A. Same pinout at both ends B. Transmit and receive wires are reversed on one end C. Used only with fiber optics D. Only transmits video signals Correct answer: B Rationale: Crossover cables are used to connect similar devices by reversing TX and RX pins. What does CWDM stand for and do? A. Current Wavelength Distribution Map B. Coarse Wavelength Division Multiplexing – separates signals by wavelength C. Cable Wireless Data Multiplexing D. Central Wireless Distribution Method Correct answer: B Rationale: CWDM multiplexes multiple light signals by assigning them unique wavelengths. What is a DB-9 connector commonly used for? A. Ethernet B. Serial communication (RS-232) C. USB D. HDMI Correct answer: B Rationale: The DB-9 is a 9-pin connector used for serial data communication.