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College Computer Networking I
Exam Study
54
Computer Networking
Undergraduate 1
02/14/2007

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Term
ANSI
Definition
American National Standard Institute; comprised of individuals from the industry and government.
Term
EIA
Definition
Electronic Industry Alliance
Term
TIA
Definition
Telecommunications Industry Association
Term
IEEE
Definition
Institute of Electrical & Electronics Engineering
Term
ISO
Definition
International Organization for Standardization
Term
ISOC
Definition
Internet Society
Term
IANA
Definition
Internet Assigned Numbers Authority
Term
OSI
Definition
Open Systems Interconnection Model; divides network communication products into seven layers
Term
Name the seven network layers (Programmers Do Not Throw Sausage Pizza Away "PDNTSPA")
Definition
Application; Presentation; Session; Transport; Network; Data Link; Physical
Term
What does the APPLICATION LAYER of a network do?
Definition
Provides protocol that allows the network to interact with applications; HTTP, FTP, SCP, SSH, SSL, TFTP; interacts with the presentation layer.
Term
What does the PRESENTATION LAYER of a network do?
Definition
Accepts application layer data and formats it so that one type of application from one host can understand data from another host with a different application; does encryption, compression / compressing files.
Term
What does the SESSION LAYER of a network do?
Definition
Coordinates and maintains communication between two nodes on the network. A session is an on-going data transfer process between two nodes. Each time a new session is opened you are given a specific number that differentiates one session from another and helps maintain your connection.
Term
What does the TRANSPORT LAYER of a network do?
Definition
Ensures that data is delivered in order and reliably
Term
What does the NETWORK LAYER of a network do?
Definition
Translates IP addresses into their physical counterparts (MAC addresses); routes data (packets) from source to destination.
Term
What does the DATA LINK LAYER of a network do?
Definition
Takes data from the physical layer and allows the network layer to understand it; transforms/takes packets from the network layer into frames to be passed to the physical layer (adds their physical addresses).
Term
What does the PHYSICAL LAYER of a network do?
Definition
Accepts frames from the data link layer and turns them into bits (physical frames -> bits -> electrical signals -> voltage).
Term
In networking, what does the term 'transmit' mean?
Definition
To issue signals to the network medium.
Term
What is transmission?
Definition
The process of transmitting signals.
Term
What are the two ways of transmitting network signals?
Definition
Analog and Digital
Term
What is TDM?
Definition
Time Division Multiplexing (STDM [Statistical] is more effective than TDM)
Term
What is the definition of 'throughput'?
Definition
How data is actually sent over a period of time.
Term
When referring to noise in networking, what does 'EMI' mean? What does 'RFI' mean?
Definition
Electromagnetic Interference; Radio Frequency Interference
Term
An amplifier is a(n): (a) analog signal, (b) digital signal
Definition
(A) Analog Signal
Term
A repeater is a(n): (a) analog signal, (b) digital signal
Definition
(B) Digital Signal
Term
When referring to thicknets, "10 base 5" means what?
Definition
"Speed, technology, distance"; "10mbps, baseband, how far you can go before needing a repeater (500m)"
Term
Thinnet is: (a) 10 base 2, (b) 10 base 3, (c) 10 base 5, (d) 100 base 7
Definition
10 base 2 (185m)
Term
What is a STP?
Definition
Shielded Twisted Pair; more expensive and provides a greater protection against network noise
Term
What is an USTP?
Definition
Unshielded Twisted Pair; less expensive and is more vulnerable to network noise
Term
STP and USTP can both reach speeds between what range?
Definition
10Mbps and 100Mbps
Term
What is '10 base T' and what rule does it follow?
Definition
10Mbps, baseband, twisted pair; follows the '5-4-3 rule' (fast Ethernet)
Term
1000 base T is referred to as what?
Definition
Gigabit Ethernet
Term
What is 10 base F1 used for and what is its maximum distance?
Definition
It is used to connect workstations to a LAN or two repeaters; maximum distance is 1000m
Term
10 base F is what mode and duplex? What is it mostly used for?
Definition
Multimode; full duplex; mostly used for backbone
Term
What is the '5-4-3 rule'?
Definition
No more than five (5) network segments connected by four (4) repeaters and no more than three (3) can be connected.
Term
Fiber-optic Cable uses what medium to send data?
Definition
Light
Term
Name three advantages to using fiber-optic cables
Definition
Able to carry signals for much longer distances before requiring a repeater; nearly unlimited bandwidth; much higher resistance to network noise (no EMI)
Term
SMF has how many mods? How many signals does it send? What is it used for?
Definition
Single mod; sends one signal; used for WANs
Term
What is MMF? How many mods does it have? How many signals does it send? What is it used for?
Definition
Multiple mod; sends multiple signals, used for LANs
Term
What is the networking definition of 'bend radius'?
Definition
How far a fiber-optic cable can be stretched before impairing data transmission.
Term
1000 base LX is a type of fiber-optic cable. Does it have a long or short wavelength? How long is the wavelength? What type of network is this type of cable used for?
Definition
Long wavelength; 550m; WAN
Term
1000 base SX is a type of fiber-optic cable. Does it have a long or short wavelength? How long is the wavelength?
Definition
Short wavelength; 550m
Term
What does a 'straight through cable' mean?
Definition
Connections coming in will go out the same way.
Term
In wireless networking, radio frequencies (RFs) can be what three types of waves?
Definition
Infrared, microwave, sattelite.
Term
Radio frequencies use what as a medium?
Definition
Air
Term
True or False: Radio frequencies travel in specific paths
Definition
False, there is no specific path a radio wave takes
Term
What is an antenna used for?
Definition
To send wireless signals through the air
Term
What type of communication is a directional antenna used for?
Definition
Point-to-point communication
Term
What is an omni-directional antenna used for?
Definition
Broadcasting
Term
When discussing antennas and wireless systems, what is the definition of 'range'?
Definition
The geographical area an antenna or wireless system can reach
Term
In the wireless spectrum, what can be found between 9KHz to 100KHz?
Definition
Radio waves
Term
In the wireless spectrum, what is found between 100KHz to 1MHz?
Definition
AM Radio
Term
In the wireless spectrum, what is found between 10MHz and 100MHz?
Definition
FM Radio
Term
In the wireless spectrum, what is found from 100MHz to 1GHz?
Definition
Television
Term
Why is reflection used in fiber-optic cables and other forms of network data transmission?
Definition
For transmitting/bouncing objects towards their destination
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