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Mod 6 > Day 1 > Flashcards

Day 1 Flashcards

(60 cards)

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1
Q

The primary motivation for networking:

A 
The need for people to share data and to communicate quickly and efficiently.
Benefits of networking:
--file sharing
--electronic mail
--device sharing
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2
Q

protocols

A

allow computers to establish and maintain useful communication at various levels

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3
Q

Local Area Network (LAN)

A

Small network, limited to a single connection of nodes and one or more cables contained in a building or relatively small geographic area (intranetwork)

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4
Q

Wide Area Network (WAN)

A

Links two or more separate locations and can span a relatively large geographic area. (internetwork)

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5
Q

Two major types of network architecture

A

Peer-to-peer network and Client-Server Network

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6
Q

Peer-to-peer network

A

computers connect with each other in a workgroup to share files, printers, and internet access. There is no server

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7
Q

Client-Server Network

A

There is usually a central server to which all computers logon

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8
Q

DoD Information Network (DODIN)

A

The collection of networks owned and managed by DoD

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9
Q

Non-Classified Internet Protocol Router Network (NIPRNet)

A

DoD’s unclassified but sensitive Internet Protocol Router Network

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10
Q

Secret Internet Protocol Router Network (SIPRNet)

A

DoD’s secret internet protocol router network. it is a classified tunnel carried over NIPRNet. Provides a secure transmission of data to the secret classificaiton level

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11
Q

Joint Worldwide Intelligence Communications System (JWICS)

A

DoD’s network for handling up to the top secret classified information, including Sensitive Compartmented Information (SCI). JWICS is a dedicated collection of equipment and circuits that are independent of the internet.

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12
Q

Network topologies

A

specify the geometric arrangement of the physical layout of a network

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13
Q

bus topology

A

has a series of devices, daisy chained, with successive coaxial cable and appropriate connectors and terminators

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14
Q

star topology

A

network with a concentrator/hub device that acts as a central point for all cabling
The hub is a single point of failure

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15
Q

Ring topology

A

networks connect devices in a complete ring

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16
Q

token ring

A

uses a token-passing mechanism to control which systems can transmit data over the network medium.

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17
Q

mesh topology

A

every device can connect to every other device via more than one route

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18
Q

partial mesh topology

A

consists of at least two machines with redundant connections

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19
Q

full mesh topology

A

is an organized grouping of devices where every device connects to one another

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20
Q

full mesh topology formula

A

n(n-1)/2

n= number of nodes

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21
Q

hybrid topology

A

combines the aspects of bus, star, or ring topologies into one network

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22
Q

point to multipoint topology

A

consists of multiple devices connecting to a single device in order to communicate.
computers on the network communicate with the central device but not with the other.
this differs from a star topology because a star topology computers communicate with each other.

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23
Q

coaxial cabling

A

-almost obsolete in LAN installations
network installations requiring a rugged means of cabling and delivery of cable television and internet access to residential areas still use coaxial cables.

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24
Q

more about coaxial cabling

A

coaxial cabling used in physical bus topology networks is referred to by Ethernet as “thinnet” and “thicknet”. Networking refers to it as 10Base2 and 10Base5

  • 10 is the speed in Mbps at which devices operate
  • Base indicates baseband transmission
  • 2 and 5 indicate length in 100’s of meters for the maximum segment length
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25
Twisted pair cabling
most popular medium for voice and data transmission in LAN's and WAN's. A different number of twists per inch used for each pair reduces interference, called crosstalk, from adjacent pairs and other electrical devices
26
Shielded Twisted Pair (STP)
includes a wire braid inside the cladding or sheath material and a foil shielding around each wire pair. UTP has no sheathing material or foil inner wrapper
27
Unshielded Twisted Pair (UTP)
UTP has no sheathing material or foil inner wrapper
28
CAT5 cable
most common twisted pair cabling. supports voice and data up to speeds of 1000 Mbps uses an RJ-45 connector
29
straight through cables
used to connect different networking devices to each other
30
crossover cables
used to connect like devices to each other
31
fiber optic cabling
transmits pulses of light rather than electrical signals eliminating the problem of EMI, radio frequency interference, or inductance
32
single mode
- made of small diameter glass fiber - single transmission path - higher bandwidth than multimode - requires the use of lasers as light source - supports longer transmission distances and higher transmission rates than multimode - costs more to implement
33
multimode
- has a larger diameter core - supports multi-propagation paths - cheaper to implement - provides lower bandwidth than single mode - uses LED as light source - used for short distance communication
34
Wireless Access Point (WAP)
antenna that translates between wireless and wired networks
35
Service Set Identifier (SSID)
designates and separates each wireless network
36
data transmission methods
baseband and broadband
37
baseband
uses only a single fixed frequency to send a signal that occupies the cable's entire carrying capacity
38
broadband
carries multiple channels on a single cable, where one channel is required to send and another to receive
39
digital signals
carries data in a digital form using values of electrical voltage or current or as an on/off light source. less susceptible to noise and interference
40
analog signals
uses a continuously varying waveform to carry data.
41
Digital/Telecommunications Convergence
the combination of voice, data, video, and pictures
42
Public Switched Telephone Network (PSTN)
the world's largest interconnected voice-oriented public telephone networks. almost entirely digital and includes mobile and fixed telephones
43
Plain old telephone service (POTS)
the original fixed-line analog telephone system
44
Integrated Services Digital Network (ISDN)
an international communications standard for sending voice, data and video over telephone lines. supports data transfer rates of 64 Kbps utilizing baseband or digital signals
45
Digital Subscriber Line (DSL)
a modulation scheme to pack data onto copper lines or existing telephone lines. offers data transmission speeds of up to 100 Mbps with the proper equipment and three types of service (Asymmetric DSL, Symmetric DSL, Very High Bitrate DSL)
46
Asymmetric DSL
(ADSL) allows for faster downstream data rates than upstream rates
47
Symmetric DSL
(SDSL) Supports same data rates for upstream and downstream transfers
48
Very High Bitrate DSL
(VDSL) provides up to 100 Mbps upstream and downstream speeds
49
Asynchronous Transfer Mode (ATM)
high speed network technology designed for use on both LANs and WANs. It is connection-oriented and uses a dedicated circuit between switches. supports data, voice, and video in real time using 53-byte fixed length cells
50
Synchronous Optical Network (SONET)
a high-speed, digital networking standard that specifies data rates over fiber-optic connections. uses a baseband signal, providing for synchronous communications. Partnered with ATM where ATM is the underlying signalling technology, while SONET is the overlying communications standard.
51
Footprint
the area on the earth that the satellite signal strikes regardless of orbit type
52
geostationary orbit
satellite appears to hang motionless over a point on the equator. enables the satellite to be visible or accessible from roughly 30 to 40 percent of the Earth's surface
53
elliptical/non-geostationary orbit
provides wider coverage than geostationary orbit. apogee-the orbit point farthest from Earth perigee-the orbit point closest to the Earth. more than satellite is needed in order to provide 24/7 coverage
54
Very Small Aperture Terminal (VSAT)
networking services such as data, voice, video, and fax transmissions are delivered using geostationary satellites. work in a mesh or star topology
55
VSAT mesh topology
communications go from the VSAT to satellite and then directly to the destination VSAT
56
VSAT star topology
communications must go through a hub station
57
VSAT configurations
point-to-point, point-to-multipoint, and multipoint-to-point
58
point-to-point
communications occur between two or more earth stations. | uses mesh topology
59
point-to-multipoint
one transmitter and multiple receivers. | uses star topology
60
multipoint-to-point
multiple transmitters and one receiver acting as a hub. | uses star topology

Mod 6 (7 decks)

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