Physical Layer
Everything on SkillVeris tagged Physical Layer — collected across the glossary, study notes, blog, and cheat sheets.
13 resources across 1 library
Interview Questions(13)
What is the Physical Layer (OSI Layer 1)?
The Physical layer is OSI Layer 1 — it defines how raw bits (1s and 0s) are converted into actual signals (electrical voltage, light pulses, or radio waves) an…
What is a Modem and How Does It Differ from a Router?
A modem (modulator-demodulator) is the device that converts digital data from your home network into the analog or carrier signal format used by your ISP’s tra…
What is a Network Interface Card (NIC)?
A Network Interface Card (NIC) is the hardware component — a physical card, onboard chip, or virtual adapter — that connects a device to a network, handling th…
What is Full-Duplex vs Half-Duplex Communication?
Full-duplex means a link can send and receive data simultaneously in both directions at once, while half-duplex means only one direction can transmit at a time…
What is a Crossover Cable?
A crossover cable is an Ethernet cable wired so that the transmit pins on one end connect to the receive pins on the other end, allowing two similar devices, s…
Straight-Through vs Crossover Cable: What is the Difference?
A straight-through cable wires each pin to the identical pin number on both ends and is used to connect dissimilar devices, such as a computer to a switch, whi…
What is Power over Ethernet (PoE)?
Power over Ethernet (PoE) is a technology that delivers electrical power alongside data over the same twisted-pair Ethernet cable, letting devices like IP came…
What is a Repeater?
A repeater is a simple Layer 1 (Physical layer) networking device that receives an electrical, optical, or radio signal, regenerates and amplifies it to remove…
What is a Network Hub?
A network hub is a basic Layer 1 device that connects multiple Ethernet devices into a single network segment by electrically repeating every incoming signal o…
What is Structured Cabling?
Structured cabling is a standardized, hierarchical approach to designing and installing a building’s network wiring — organizing cables into defined subsystems…
Fiber Optic vs Copper Cabling: What is the Difference?
Fiber optic cabling carries data as pulses of light through a glass or plastic core, while copper cabling carries data as electrical voltage over metal conduct…
Single-Mode vs Multimode Fiber: What is the Difference?
Single-mode fiber has a narrow core (about 9 microns) that carries one light path from a laser over very long distances with minimal loss, while multimode fibe…
What is a Patch Panel?
A patch panel is a mounted panel of fixed ports that terminates the permanent, in-wall cabling runs on one side and exposes labeled front-facing ports on the o…