CompTIA A+ 220-1201 4th Set of Videos

Cat 6 UTP distance at 10 Gbps

55 meters.

Cat 6A distance at 10 Gbps

100 meters.

Plenum-rated cable requirement

Used in any open airspace, such as above a drop ceiling.

Plenum vs. PVC safety

PVC releases toxic fumes when burned; Plenum-rated cable does not.

S/FTP shielding notation

Braided overall shielding with foil shielding for each pair.

U/UTP shielding notation

Unshielded overall and unshielded twisted pairs.

Drain wire purpose

Acts as an electrical ground in shielded or direct burial cables.

Differential signaling in twisted pair

The receiver cancels interference by comparing positive and negative signals.

T568A vs. T568B color difference

The orange and green pairs trade places (pins 1, 2, 3, 6).

T568A Pin 1 color

White/Green.

T568B Pin 1 color

White/Orange.

Standard US network wiring default

T568B.

Wiring mistake: A on one end, B on the other

Not a valid crossover; it is a wiring error.

Fiber optic layers (inside to out)

Core → cladding → buffer.

Fiber optic physics (refractive index)

High index in core, low index in cladding to keep light inside.

Multimode Fiber (MMF) characteristics

Short distances (~2km), LED light source.

Single-mode Fiber (SMF) characteristics

Long distances, laser light source.

Fiber color coding: Yellow

Single-mode fiber.

Fiber color coding: Orange or Aqua

Multimode fiber.

Modal dispersion

Signal smearing in multimode fiber caused by different light paths.

USB-C Speed

Depends on the device; the connector shape does not define speed.

USB 2.0 speed

480 Mbps.

USB 3.0 speed

5 Gbps.

USB 3.2 speed

20 Gbps.

DB-9 connector use

Serial/console access to network devices like switches and routers.

Thunderbolt unique feature

Daisy chaining multiple devices from a single port.

HDMI and DisplayPort

Cables that carry both audio and video signals.

VGA and DVI

Cables that carry video signals only.

DisplayPort release button

The mechanism required to unlock the cable from the port.

DVI-A

Analog signal only.

DVI-D

Digital signal only.

DVI-I

Integrated; carries both analog and digital signals.

VGA connector color and type

Blue connector, analog signal, 15 pins (DE-15).

SATA 3.0 speed

6 Gbps.

SATA drive installation requirements

One data cable (7 pins) and one power cable (15 pins).

eSATA power delivery

Data only; requires an external power source for the drive.

Molex connector

Legacy 4-pin white power connector used before SATA power.

Passive adapter

Changes connector shape; used when both sides use the same signal.

Active converter

Performs signal processing; used when signal types differ (e.g., VGA to HDMI).

DVI-D to HDMI connection type

Passive adapter (both are digital signals).