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49 Cards in this Set

  • Front
  • Back
is a communications system designed to transmit and receive digital information between computers.
local-area network (LAN)
are the hardware connected to the network, such as personal or microcomputers, printers, large capacity hard drives, and so on
are the communications media, such as twisted-pair wire, coaxial, or fiber-optic cables that connect the nodes
Advantage twisted-pair cable is?
easy to install and costs little on a per-foot basis
Twisted pair's disadvantages includes
limitations in capacity and speed. It is also susceptible to electrical interference unless its shielded
You can use either baseband or broadband transmission methods with
Coaxial Cable
Coxial Cable examples:
RG-11, RG-58, RG-59, RG-62
Baseband coaxial systems advantages:
inexpensive, easy to install, and have low maintenance.
allow very high data transmission rates.
Baseband coaxial systems disadvantages:
are limited to transmitting digital signals only
broadband coaxial systems advantages:
support data, voice, and video signals that may be transmitted simultaneously
broadband coaxial systems disadvantages:
broadband systems are their higher installation costs and complex maintenance
Fiber-Optic Cable advantages:
best choice if a secure network is needed.
transmissions are immune to interference caused by electrical or electronic devices.
lasts longer than other types of cable and can carry many more channels.
Fiber-Optic Cable disadvantages:
high price, poor connectivity, and low flexibility
attach personal computers to the LAN, you must connect with a?
network interface card (NIC)
Is a combination of hardware and software that is used to manage the shared resources of the network
is able to control network traffic as well as the sharing of other resources, such as application programs, disk space, data files, and printers.
network server
performs the processing of the network control software and the central processing and storage point of the application software and data files of the network
file server
provide some level of uniformity among computer manufacturers and network vendors
is concerned with the transmission of the unstructured raw bit stream over a physical medium
Physical Layer
provides error-free transmission of information over the physical medium
data-link layer
defines the software protocols necessary to exchange data on the network
transport level
decides which physical pathway the data should take based on network conditions, priorities of service, and other factors
network layer
makes sure data units are delivered error-free, in sequence, without losses or duplications
transport layer
allows users on different machines to establish sessions between one another
session layer
formats data to be presented to the application layer. It can be viewed as the translator for the network
presentation layer
serves as the window for the application process to access the OSI environment
application layer
The greatest advantage of your using layer architecture in a network is
hardware independence
is like a data highway. That is, all components or nodes are connected to the same cable, and the far ends of this cable never meet
linear bus topology
allow individual nodes to be out of service or to be moved to new locations without disrupting service to the remaining nodes
linear bus topology
disadvantage of linear bus topology is that
must be a minimum distance between workstations to avoid signal interference. Nodes must compete with each other for the use of the bus.
No easy way for the network administrator to run diagnostics on the entire network.
Bus network can be easily compromised by an unauthorized network user.
each component is connected directly to the central computer or network server
star network
star network advantages:
New workstations can be easily added to the network without interrupting other nodes.
selected nodes a higher priority status than others.
star network disadvantages:
reliance on the central computer for performing almost all the functions of the network.
connects workstations to a central point called a hub. This hub can support several workstations or hubs which, in turn, can support other workstations
can use inexpensive hubs with long runs of shared cable between hubs, similar to the bus topology
This topology allows a node to send a message to another node on the ring. However, the message must be transmitted through each node until it reaches its destination
major disadvantages of ring topologies is
the extreme difficultly of adding new workstations while the network is in operation.
Carrier Sense Multiple Access
Carrier Sense Multiple Access with Collision Detection
half-duplex protocol that transmits strings of characters at lower speeds over dial-up circuits. The information movement is in one direction at a time, with each data transfer being answered by an acknowledgement
control procedure that sends multiple blocks of data and returns a single acknowledgement for many blocks, thereby increasing the amount of time spent transmitting data
IEEE 802.3
Carrier sense multiple access/collision detection (CSMA/CD)
IEEE 802.4
Token Bus
IEEE 802.5
Token ring
star topology with a CSMA/CD protocol. Its throughput speed is 1Mb per second over twisted-pair cable
distributed star topology that uses a token passing protocol and either twisted-pair or coaxial cabling. Its throughput speed is 2.5Mb per second
uses a star ring topology, and is defined by the IEEE 802.5 specification. It has a throughput speed of 4 Mbits per second and 16 Mbit per second.
IBM Token Ring Network
Optimizing access to services by users.
Maintaining status information of many of the processes.
Error reporting.
Service initialization and service termination of workstations.
Control Kernel
The most important job of a network operating system (NOS) is to
provide file service for the attached computers