NAVEDTRA 14224, INFORMATION SYSTEMS TECHNICIAN TRAINING SERIES MODULE 3 NETWORK COMMUNICATIONS Flashcards
Which type of network are the workstations in close proximity to each other, usually within the same
building?
Local Area Network
Which type of network are the workstations basewide as in one command connected to another command or one base connected to another base?
Metropolitan Area Network
How many primary modes of system operation are there?
2
How many common situations for rebooting the system are there?
4
Which term refers to the process of recording events and using that information to detect usage violations or to confirm that network procedures are operating correctly?
Auditing
What is defined as a mechanism by which one computing element can get the attention of another element?
Interrupt
How many Interrupt Request Lines (IRQs) for hardware interrupts are there in a PC environment?
16
What is defined as a connection on the back of a computer where you connect peripherals, switches, networks,
or other devices?
Port
Which type of hardware connection is used to send data one bit at a time and is very good for sending information over a long distance?
Serial
Which names are reserved by DOS to reserve the first serial and parallel ports, respectively?
COM1 and LPT1
During the pinging process what is the ping that is sent out called?
Echo message
What prevents files from being updated by more than one user at a time?
Data Integrity
Which term refers to duplicate hardware and network facility segments that are available at all times?
Redundancy
What is the physical arrangement of a LANs components called?
Topology
What are the three major types of LAN configurations or topologies?
Star, Bus, and Ring
Which type of network is each component connected directly to the central computer or network server?
Star
Bus topology, also known as line topology, is a type of network topology in which all devices in the network are connected by one central RJ-45 network cable or coaxial cable. The single cable, where all data is transmitted between devices, is referred to as the bus, backbone, or trunk.
Bus
Of all the topologies which is the least reliable because it has a single point of failure?
Ring
What is the wiring concentrator which allows workstations to be either inserted or bypassed on the ring?
Multistation Access Unit (MAU)
What define how networks establish communications between elements, exchange information, and
terminate communications?
Protocols
How many major functions do protocols have?
2
Which control procedures ends multiple blocks of data and returns a single acknowledgement for many blocks, thereby increasing the amount of time spent transmitting data?
SDLC
What are the two principal network access methods?
Contention and Token passing
How many layers does the OSI model consist of?
7
What provides a basis for coordinating the development of standards that relate to the flexible interconnection of incompatible systems using data communications facilities?
Open Systems Interconnection (OSI) model
Which layer of the OSI model is the physical layer?
1
Which layer of the OSI model is the data link layer?
2
Which layer of the OSI model is the network layer?
3
Which layer of the OSI model is the transport layer?
4
Which layer of the OSI model is the session layer?
5
Which layer of the OSI model is the presentation layer?
6
Which layer of the OSI model is the application layer?
7
Which layer of the OSI model addresses the electrical, mechanical, and functional interface to the carrier?
Physical
Which layer of the OSI model provides error free transmission of information over the physical medium?
Data link
Which layer of the OSI model decides which physical pathway the data should take?
Network
Which layer of the OSI model ensures data units are delivered error free, in sequence, with no losses or
duplications?
Transport
Which layer of the OSI model performs the functions that enable two applications to communicate across the
network, performing security, name recognition, logging, administration, and other similar functions?
Session
Which layer of the OSI model provides a common representation of data that can be used between the application processes?
Presentation
Which layer of the OSI model provides data encryption for privacy and authentication?
Presentation
Which layer of the OSI model represents the services that directly support users and application tasks?
Application
What is by far the cheapest type of transmission media?
Twisted wire pairs
What are the two most common types of twisted pair media?
22 and 24 gauge
What is the transmission rate of a T1 line?
1.5 Mbps
What is the transmission rate of a T2 line?
6.3 Mbps
What is the transmission rate of a T3 line?
46 Mbps
What is the transmission rate of a T4 line?
281 Mbps
What is defined as a software package that makes it possible to implement and control a network and enables
users to use the resources and services on that network?
Network Operating System (NOS)
What are used to secure a Local Area Network from a public network?
Firewalls
What can be used to amplify electrical signals?
Repeaters
What make it possible to interconnect like LANs?
Bridges
What enable networks to communicate using the most efficient path?
Routers
What make it possible to interconnect unlike LANs?
Gateways
Which layer of the OSI model do repeaters work at?
1
Which layers of the OSI model do bridges work on?
1 and 2
Which layer of the OSI model do routers work on?
3
Which layers of the OSI model can a brouter work on?
2 or 3
Which layer of the OSI model do gateways work on?
7
What serves as a termination point for cable running from individual nodes in a network?
Concentrator
Which device serves as a common termination point that can relay signals along the appropriate paths?
Hub
Which type of transmission media is immune to interference caused by electrical or electronic devices?
Fiber
Which type of cable refers to the cable that forms the main trunk of a network?
Backbone
How many different types of backbone cable are recognized by ElA/TlA 568?
4
What is the central computer in a network that is responsible for managing the network?
server
Which type of servers can be used as both a server and a workstation?
Non-dedicated
What are the majority of all network related problems caused by?
Operator error
How many primary culprits to network malfunctions are there?
3
How many categories are component failures categorized into?
2
What are the simple set of system checks called that are stored in ROM that are run when the computer is
turned on?
Power On Self Test (POST)
Which device can be used to monitor the activity of a network and the stations on it and provides daily summaries or long term trends of network usage and performance?
Network analyzer
What is the simultaneous presence of signals from two nodes on the network referred to as?
Data collision
What is the hardware signal that is sent from a potential transmitter to a destination to indicate that the
transmitter wishes to begin a transmission?
Request To Send (RTS)
What is the hardware signal that is sent from a receiver to a transmitter to indicate that the transmitter can
begin sending?
Clear To Send (CTS)
Which term is used to describe the random electrical signals that become part of a transmission, that serve to
make the signal component of the transmission more difficult to identify?
Noise
How is the Signal to Noise Ratio (SNR) usually expressed?
dB
What can be used to determine how long a cable segment can be before the signal loss is unacceptably high?
Signal to Noise Ratio (SNR)
What is defined as the decrease in signal strength, measured in decibels (dB) per 100 feet?
Attenuation
What is defined as interference in the form of a signal from a neighboring cable or circuit?
Crosstalk
What is used to try to eliminate the effects of certain types of distortions on the signal?
Line conditioning
Which device is used to test the integrity of a section of cable before the cable is even unwound?
Time Domain Reflectometry (TDR)
Which type of connector uses two prongs to pierce the cable to make its connection?
Vampire tap
Coaxial cable is used extensively in local area networks whenever the distance involved is relatively short,
generally less than 2 miles for baseband LANs and how many miles for broadband LANs?
10
