Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Commtech 4 > Commtech 4 > Flashcards

Commtech 4 Flashcards

1
Q

Codec

A

Compression/decompression

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
1
Q

Mpeg

A

Moving picture expert group

Name of a family of standards for coding video and audio information in a digital compressed format

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
1
Q

I-picture

A

Intra-coded picture

Single compressed picture that contains all the spatial information of a video picture

Encoded as free standing image (no B-pic or P-pic reference)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
1
Q

P-picture

A

Predictive

Computed based on nearest previous I- or P-pic

More compressed than I- pictures and provide a reference for the calculations

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
1
Q

B-pictures

A

Bi-directional pictures

Use both past and subsequent pictures as references to calculate the compressed picture data

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
1
Q

DTCP

A

Digital transmission content protection

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
1
Q

ACP

A

Analog copying & piracy

Prevents or distorts copies made over an analog connection

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
1
Q

CA

A

Conditional access

The protection of content by requiring certain criteria to be met before granting access to this content

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
1
Q

HTIB

A

Home theater in a box

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
1
Q

Direct view tv

A

CRT
Least expensive
Highest quality picture
Size limitations

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Rear projection tv

A

CRT,DLP, LCD,LCos

Larger screen size
Lower profile
Affordable

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Front projection tv

A

CRT, DLP, LCFD, LCos

Largest size
Needs highly reflective screen

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Flat panel

A

LCD, Plasma

Larger size screen
Lowest profile

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Four actions performed by a virus

R,Ew,C,D

A

Replication, event watching, camouflage, delivery

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Main types of viruses

E,Em,W,Th

A

Executable, email, worms, Trojan horses

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Replication

A

Inserts copies of itself into other program files

Replicates itself

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Event watching

A

Checks for conditions (usually a specific date)

When conditions exist, virus delivers its destructive payload.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Camouflage

A

Disguise themselves to avoid antivirus detection

May falsify information in header so program file appears to be the correct size

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Delivery

A

When triggering condition is met
, virus unleashes payload

May be harmless or destructive

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Executable virus

A

Software that piggybacks on rep programs

When program runs, the virus runs too

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

E-mail virus

A

Contained in an email or its attachments or both

Usually replicates itself by mailing itself to dozens of people in victims email address book

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Worms

A

Software: uses computer networks and security holes to replicate itself

A copy of the worm scans the network for another machine that has a specific security hole.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Trojan horses

A

Small program

Claims to be something it’s not (like a game) but when it runs it does damage (sending e,ails, erasing files)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Spyware

A

A program that sends information about you and how you use your PC to makers and advertisers, usually without you being aware

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Spammers target

A 
Email
Instant messaging
Newsgroup
Search engines
Blogs
Mobile phones
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

3 main types of firewall rules

A

Packet filtering
Proxy
Stateful inspection

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

MPOE

A

Minimum point of entry

Commercial demarcation point for business class digital voice

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Telemetry cable

*Color sequence

WBBOG

A

White brown blue orange green

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Network

A

A system of computers, peripherals, terminals, and databases connected by communications lines

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

LAN

A

Local area network

Close set of computers on a single network

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

WAN

A

Wide area network

Example Internet

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

Firewall

A

A firewall permits and blocks traffic

Hardware or software

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

VPN

A

Virtual private network

Uses a public network to establish a secure connection with an organization private network

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

NAT

A

Network address translation

Technique by which several computers share a single IP address for access to the Internet

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

PAT

A

Port address translation

Forwards requests for a particular ip port pair to another ip port pair

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

Subnetworks

A

Subnetting is the concept of partitioning large networks into smaller segments

255.255.255.0

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

Consider IP address 150.215.017.009

The first set (150.215) represents?

The second set (017.009) represents?

A

First set network

Second set define host (device)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

IP address contained within a subnetwork

N,R,G,B

A

Network, routable, gateway, broadcast

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

Subnet mask

A

Combined with the IP address the sub IP subnet mask allows a device to know which other addresses are local to it and which must be reached through a gateway or router. a number that explains which part of an IP address comprises the network address and which part is the host address on that network.

255.255.255.0

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

Signal leakage limits at 30 m

A

15 µV per meter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

Signal leakage limits at 3 m

A

20 µV per meter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

Ghosts

A

Caused when a TV signal of the same frequency and video content arrives at the receiver just before or just after the desired TV signal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
34
Q

Thermal noise

A

Caused by random electron activity of the atoms that make up the conductor, resistor or any part of the passive circuit in question
Happens at any temperature above absolute zero

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
35
Q

Carrier to noise

(C/N) ratio

A

The difference NP carrier level, to the noise level
Levels both are measured in dBmv
-59.2dBmv

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
36
Q

Cross modulation

XMOD

A

Crossing of modulation from one channel to another

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
37
Q

CTB

A

Composite triple beat
The tv carriers on a cable system are spaced in 6 MHz increments

Channels 5&6 are more than 6 MHz apart.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
38
Q

Interference threshold of beats

A

57 dB below the carrier

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
39
Q

Hum mod

A

Horizontal bar

60 cycle and 120 cycle modulation of the TV carriers

Carrier to him ratio of 30 DB or better is considered acceptable

40
Q

QPSK

A

Quadrature phase shifting keying

Modulation algorithm where in the carrier is shifted in 90° Steps

41
Q

QAM

A

Quadrature amplitude modulation

Allows two channels of information to be transmitted at the same time on a particular frequency by changing the phase and amplitude

42
Q

Signal-to-noise ratio

A

A measure of signal strength relative to background noise in analog and digital communications

43
Q

NPR

A

Noise power ratio

Measures activity levels in the unused portion of multi-channel system when there is random activity in the active channel

44
Q

MER

A

Modulation error ratio

Measures the ratio of the airpower to the average power in an ideal QAM signal

45
Q

FEC

A

Forward error correction

A method where additional data bits are added to the digital video bit stream to help identify and correct any errors that may be caused by the transmission system

46
Q

BER

A

Bit error rate

Measures how often an error occurs in a given amount of data

47
Q

POP

A

Proof of performance

48
Q

Funneling effect

A

Problems in the return path adding together

49
Q

FDM

A

Frequency division multiplexing

Being able to carry and individually select different channels on a single cable by their unique frequency

50
Q

AP

A

Access point

51
Q

POS

A

Point of sale

Baud rate 9600

52
Q

LPSU

A

Local power supply unit

53
Q

CPE

A

Customer premise equipment

54
Q

eMTA

A

Embedded multimedia terminal adapter

55
Q

C-RAN

A

Converged regional area network
Provides a single common infrastructure in which all services are delivered via IP over a consistent transport and routing architecture.
CRAN connects regional markets using HE, hubs

56
Q

LCFD

A

Liquid crystal front display

57
Q

LCos

A

Liquid crystal on silicone

57
Q

DCT

A

Digital consumer terminal

57
Q

DSL

A

Digital subscriber line

57
Q

NAS

A

Network attached storage

57
Q

DMZ

A

Demilitarized zone

57
Q

MAC

A

Media access control

58
Q

DHCP

A

Dynamic host configuration protocol

59
Q

Tracert

A

Trace route

60
Q

FQDN

A

Fully qualified domain name

61
Q

Power diplex

A

Separates or combines the AC currents two parts: AC power and RF signal

62
Q

Diplex filter

A

Separates forward and return frequency

63
Q

Response equalizer

A

Used to try and correct for any undesired peaks or valleys within the passband of the amplifier

64
Q

AGC

A

Automatic gain control

Used to come it’s safer fluctuations of the input signal

65
Q

ALS

A

Automatic level and slope control

Maintains the proper tilt and output level despite changes in the input signal

66
Q

Feedermaker

A

Signal splitter device that plugs into a trunk/bridger chassis

67
Q

TP

A

Test point

68
Q

Inline conditioner

A

Contains diplex filters but allows attenuator pads to be installed in the return portion of the spectrum.

69
Q

Fiber system components

Fc,T,R

A

Fiber cable, transmitter, receiver

70
Q

Three parts of fiber optic cable

C,C,C

A

Coating, cladding, core

71
Q

Wavelengths of light used in broadband telecommunication are centered at …… nanometers and …… nanometers

A

1550 & 1310 Nanometers

72
Q

Cbone

A

The Comcast private backbone

73
Q

Ibone

A

Internet backbone

73
Q

Virus protection types

Hd,Mra,Ss

A

Signature scanners
Heuristic detectors
Memory-resident antivirus

74
Q

Main security threats

V,A,S

A

Virus
Spyware
Adware

75
Q

Mpeg picture types

A

I pictures
P pictures
B pictures

76
Q

Six key techniques for selling

B,A,L,Pp,Cb,Afs

A 
Build rapport
Ask questions
Listen
Position the product
Communicate the benefits
Ask for the sale
77
Q

Three learning styles

V,A,T

A

Visual
Auditory
Tactile

78
Q

110 punch down block is used for?

A

Data applications

79
Q

Video modulator does what?

A

Places baseband signal onto standard rf channel carrier

80
Q

Patch bay

A

Connects building data wiring to Ethernet switch! Which is a focal point in the data network.

81
Q

/29 subnet

A

255.255.255.248

5 static ip address

82
Q

/28 subnet

A

255.255.255.240

13 static ip address

83
Q

/30 subnet

A

255.255.255.252

1 static IP address

84
Q

What what a data only

Be used for

A

Fax, point of sale

84
Q

What is the MTTR for business-class voice customers

A

4 hours

85
Q

What is the maximum power consumption of an eight line EMTA

A

60 watts

86
Q

Channel deletion filter does what?

A

Deletes unused channel for the insertion of a local feed

87
Q

RJ-11 is used for what?

A

1 line telephone jack

88
Q

RJ-14 is used for what?

A

2 line telephone jack

89
Q

RJ-25 is used for what?

A

3 line telephone jack

90
Q

RJ-21x is used for what?

A

It interfaces with multiple line telephone equipment

91
Q

RJ-45 is used for what?

A

Ethernet

Straight (PC to Router) 568A
Crossover (PC to PC) 568B

92
Q

RJ-31x is used for what?

A

Connecting a monitored alarm system with line seizure.

93
Q

Beats

A

The unwanted signal entering the network can create a number of beat patterns on the tv.

94
Q

HFC

A

Hybrid fiber coax

95
Q

Core components of CRAN

H,U,S,R,R,

A 
Hub sites
U ring
S ring
Regional core
Regional network
96
Q

Name the two backbones

A

The Comcast private backbone (Cbone) comcast

The second logical backbone (Ibone) Internet

97
Q

Name the five types of maps used in designing a cable network

B,A,B,D,S

A 
Base
Strand
Design
Amp
Build
98
Q

Name the 5keys to receive information

BERVS

A

Brevity, experience, relevance, variety, self discovery.

99
Q

When verifying proper loop current for off hook status what should it be

A

33mA

99
Q

What does REN stand for?

A

Ringer equivalency number

100
Q

A basic set up rule for a 66 block is?

A

In from left out to right
Lead with the tip
Only one wire per terminal

101
Q

Heuristic detectors looks for?

A

Sections of code triggered by time or date events, searches for files such as .com, .exe, .bat, .vbs

Commtech 4 (3 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions