CIS230 Net 2 Quiz 1

CAT3

10 mgps

The maximum segment length between the hub and a workstation of a 10BaseT, 100BaseT & 1000BaseT Ethernet is

100m

The maximum segment length between the hub and a workstation of a fiber-optic cable (10BaseF, 100BaseF & 1000baseF) is

2000 meters or 2 km

Twisted Pair Ethernet

four pairs of wires twisted around each other

Frequency-hopping

is a kind of Spread-spectrum LAN Technology that switches data among multiple frequencies at regular intervals. It requires a synchronized transmitter and receiver.

CrossTalk

occurs when signals from adjacent cables interfere with another cable's transmission

Amplifier

strengthen signals but is analog

Spread-spectrum LAN Technologies address the weaknesses of single-frequency communications.TRUE

Spread-spectrum LAN Technologies address the weaknesses of single-frequency communications.TRUE

CAT7

cables are NOT backward compatible

High frequencies

carry more data faster over shorter distances

CAT6

1000BaseT, also requires RJ45

CAT5

100BaseT, requires RJ45 connector

Disadvantages of the fiber optic cables

Fiber-optic cable is very expensive and is difficult to install.

Laser-based LAN Technologies require a clear line of sight between sender and receiver. These devices are subject to many of the same limitations as infrared but are not as subject to interference from visible light sources.TRUE

Laser-based LAN Technologies require a clear line of sight between sender and receiver. These devices are subject to many of the same limitations as infrared but are not as subject to interference from visible light sources.TRUE

State the two primary technologies used for wireless WAN transmission.

Microwave Satellite

Wireless networking depends on transmission at some kind of electromagnetic frequency through the atmosphere to carry data transmissions from one networked device to another. TRUE

Wireless networking depends on transmission at some kind of electromagnetic frequency through the atmosphere to carry data transmissions from one networked device to another. TRUE

Regeneration

a process of retransmitting a digital signal (in the original, pure form without any noise).

There is an inverse relationship between frequency and distance and a direct relationship between frequency and data transfer rate.TRUE

There is an inverse relationship between frequency and distance and a direct relationship between frequency and data transfer rate.TRUE

The maximum number of nodes of a 10BaseT, 100BaseT & 1000BaseT Ethernet is

100m per logical segment

The maximum number of nodes of a 10BaseF,100baseF & 1000BaseF Ethernet is

1024 nodes per logical segment

Advantages of the fiber optic cables

Fiber-optic cable is immune to interference. It is highly secure and eliminates the possibility of electronic eavesdropping. It is a good medium for high-bandwidth, high-speed, long-distance data transmissions.

State the two main kinds of Spread-spectrum LAN Technologies.

Frequency-hopping Direct-sequence modulation

Infrared LAN technology use infrared light beams to send signals between pairs of devices.TRUE

Infrared LAN technology use infrared light beams to send signals between pairs of devices.TRUE

State the three primary technologies used for wireless LAN transmission.

Laser Infrared Radio Radio-Narrowband, single-frequency radio Radio-Spread-spectrum radio

State the three primary categories of wireless networks.

Local area networks (LANs) Extended LANs Mobile computing

Most narrow-band, single-frequency wireless LAN technologies use unregulated radio frequencies. They are not regulated by the Federal Communications Commission (FCC). Therefore, anyone within range of the network devices can eavesdrop.TRUE

Most narrow-band, single-frequency wireless LAN technologies use unregulated radio frequencies. They are not regulated by the Federal Communications Commission (FCC). Therefore, anyone within range of the network devices can eavesdrop.TRUE

Wireless LAN transmission sends & receives signals via the atmosphere. The signals take the form of waves in the electromagnetic spectrum. Frequency (measured in Hertz.) TRUE

Wireless LAN transmission sends & receives signals via the atmosphere. The signals take the form of waves in the electromagnetic spectrum. Frequency (measured in Hertz.) TRUE

Spread-spectrum

a kind of Radio LAN Technology that uses multiple frequencies simultaneously. It improves reliability and reduces susceptibility to interference. It also makes eavesdropping more difficult.

Latency

a measure of the amount of time a signal takes to travel from one end of the cable to the other end.

Unshielded Twisted Pair (UTP)

a type of twisted-pair cabling that contains one or more pairs of insulated wires within an enclosing insulating sheath. It is prone to crosstalk on the cable.

Shielded Twisted Pair (STP)

a type of twisted-pair cabling that encloses each pair of wires within a foil shield, as well as within an enclosing insulating sheath. It supports higher bandwidth over longer distances than UTP and has no set standards.

Wireless LANs have similar components to wired counterparts. The network interface attaches to an antenna and emitter rather than to cable and connectors. A wireless network requires a(n)

access point device to bridge wireless components and the wired network.

Single mode cables

are a type of fiber-optic cable that include only one glass fiber at the core and work with laser-based emitters. They span the longest distances

Multi-mode cables

are a type of fiber-optic cable that incorporate two or more glass fibers at the core and work with light emitting diodes (LEDs). They span shorter distances.

Coaxial Cable

copper core cable wrapped in insulated materials to carry signals, ex. TV cable

Low frequencies

frequencies carry less data more slowly over longer distances

Narrow-band

is a kind of Radio LAN Technology that does not require a clear line-of-sight between sender and receiver. It works on a single frequency and is highly susceptible to eavesdropping. It requires both a receiver and transmitter be tuned to same frequency. The range is typically 70 meters.

Direct-sequence modulation

is a kind of Spread-spectrum LAN Technology that breaks data into fixed-size segments called chips and transmits on several different frequencies simultaneously.

Attenuation

loss of signal strength as transmission travels away from the source.

Broadband

requires amplifiers, an analog transmission technique which may use multiple communication channels simultaneously. It uses amplifiers to detect weak signals, strengthen those signals, and then rebroadcast them. Signal flow is one-way only so that two channels are necessary to send/receive data. Cable TV is an example of this type of transmission. It carries many different broadcast frequencies (channels).

Baseband

requires repeaters, uses digital signals sent over a cable without modulation. It uses repeaters to restore the signal to its original strength and quality before retransmitting it to another cable. The entire bandwidth of the cable is used to transmit a single data signal. Signal flow can be bi-directional but only one direction at a time. Ethernet

Two primary fiber optic cables

single and multi-mode cables

Repeater

strengthens signals but is digital

Fiber Optic Cable (10BaseF)

uses pulses of light sent along a light-conducting fiber at the heart of the cable to transfer information. It consists of a slender cylinder of glass fiber(s), called the core, surrounded by a concentric layer of cladding material and then by an outer sheath. It sends data in one direction only, therefore two cables are required to permit data exchange in both directions.