Networking concepts 5

Guided media, IS

Which are those that provide a conduit from one device to another, include twisted-pair cable, coaxial cable, and fiber-optic cable

Transport electromagnetic waves without using a physical conductor. This is often referred to as wireless communication

Neither

Unguided media transport electromagnetic waves without using a physical conductor. This is often referred to as wireless communication

True

False

Twisted Pair consists of :

Two conductors

Metal

Two conductors (normally copper), each with its own plastic insulation, twisted together.

TIA / EIA 568A wiring IS

White green , green , white orange , blue , white blue , orange , white brown , brown

Browngreenorange , white brown ,

White green , green , white orange , blue , white blue , orange , white brown

TIA / EIA 568B wiring IS

Whiteorange , orange , whitegreen , blue , white blue , green , white brown , brown

Browngreenorange , white brown whitegreen , blue , white blue , green , white brown

Neither

Mention the three types internet cables : describe what type of devices they connect and their characteristics end :

Coaxial cable is made of :

Which are the four generations of Ethernet lans :

1000Base-LX : Standard: IEEE 802.3z • Uses Copper twisted-pair • 9-micron core and 1300 nm laser • Supports 3 to 10km in lengt

True

False

10GBase-T (10 Gigabit Ethernet) • Standard: IEEE 802.3an • Uses category 5e, 6, or 7 cables • Supports 1000m cable length

True

False

Multiple beams from a light source move through the core in different paths. Multimode step-index fiber • The density of the core remains constant from the centre to the edges. • A beam of light moves through this constant density in a straight line until it reaches the interface of the core and the cladding which has a lower density. • This alters the angle of the beam's motion. • Step-index refers to the suddenness of this change, which contributes to the distortion of the signal as it passes through the fiber

True

False

Single mode • Uses step-index fiber and a highly focused source of light that limits beams to a small range of angles, all close to the horizontal. • Is manufactured with a much smaller diameter than that of multimode fiber, and with substantially lower density. • The decrease in density results in a critical angle that is close enough to 90° to make the propagation of beams almost horizontal. • Propagation of different beams is almost identical. • Delays are negligible.

True

False

Networking concepts 5

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