LAN: Chapter 2,3: Homework & Quiz Flashcards
The impedance of thin coax cable is ____________.
50 ohms
An ordinary radio or telephone signal is an example of a(n) ___________ transmission.
analog
A bus network has a(n) _____________ at each end.
terminator
__________ cable is Teflon-coated and does not emit a toxic vapor when burned.
Plenum
____________ is a network communication technique that uses a dedicated channel to transmit information between two nodes.
Circuit switching
Sets standards for modems, e-mail, and digital telephone systems.
ITU
Develops standards for electrical interfaces, such as serial interfaces on computers.
EIA
Works with U.S. businesses, government agencies, and international groups to achieve agreement on standards for products ranging from bicycle helmets to communications cable.
ANSI
A nongovernmental organization that promotes international cooperation and standards in science, technology, commerce and intellectual discovery.
ISO
Develops telecommunications and cabling standards.
TIA
Responsible for the 802 standards.
IEEE
Focuses on technical Internet issues such as routing.
IETF
Developed in the 1990s as a way to realistically implement portions of the X.500 standard.
LDAP
Coordinates domain naming.
ICANN
___________ cable is usually glass.
Fiber-optic
Each token ring network designates one node as the ______________, which is responsible for packet timing on the network and for issuing new token frames if problems occur.
active monitor
The bottom layer of the OSI model.
Physical Layer
Whenever you use an Internet browser, you are working through this layer.
Session Layer
This layer establishes the level of packet error checking.
Transport Layer
The task of this layer is to organize bits so that they are formatted into frames.
Data Link Layer
This layer is responsible for data encryption.
Presentation Layer
This layer ensures that data is sent and received in the same order.
Transport Layer
This is the layer computer programmers use to connect workstations to network services.
Application Layer
This layer determines how long a node can transmit and how to recover from transmission errors.
Session Layer
This layer controls the passage of packets along the network.
Network Layer
Regional telephone companies are also called__________ or regional bell operating companies (RBOCs).
telcos
____________ is used to provide a way to quickly adapt protocols that are not fully compliant with 802.2 standards, such as AppleTalk and DEC’s LAT protocols.
Ethernet SNAP
The ________ for optical fiber cable communications is the difference between the transmitted power and the resulting signal strength, or sensitivity, at the receiver as measured in decibels.
power budget
___________ are logical communication paths set up to send and receive data.
Virtual circuits
A(n) _________ cable is a cable that consists of a single cable sheath containing a combination of fibers and copper cables.
hybrid fiber/coax
The impedance of 10BaseT UTP ethernet cable is ___________.
100 ohms
The EIA/TIA-568 standard specifies that ___________ cabling be used to connect workstations and servers in the work area.
horizontal
Attenuation in fiber-optic cable is measured in _________.
decibels
A(n) ________ typically contains a fixed amount of data formatted to be transmitted at high speeds, from 155 Mbps to over 1 Gbps.
cell
Modern networks combine the logical communications of a(n) ________ with the physical layout of a(n) ____________________.
bus, star
The __________ is the total amount of communications cable that makes up a network.
cable plant
When using _________, it is possible for several frames from several nodes to be on the network at a given time.
FDDI
A(n)_________ is a device that receives multiple inputs or signals from multiple sources and transmits them to one (usually) or more shared high-speed media.
multiplexer
____ establishes a dedicated logical circuit between the two transmitting nodes.
Packet switching
Category ____ twisted-pair cable has a transmission rate of 1000 Mbps.
6 and 5e
A(n) ______ is software that enables a computer to communicate with devices such as NICs, printers, monitors, and hard disk drives.
driver
A(n) _______ line is a dedicated telephone line that can be used for data communications to connect two different locations for continuous point-to-point communications.
T-carrier
____ encoding simply checks for a change in the signal state, from low to high or high to low.
State-transition
____ cable does not experience EMI or RFI.
Fiber-optic cable
The “A” in AUI stands for ____.
attachment
After the PDU is received by the next layer, the control information and transfer instructions are stripped out, and the resulting packet is called the ____.
service data unit
