LAN: Chapter 2,3: Homework & Quiz

Question 1

The impedance of thin coax cable is ____________.

Answer 1

50 ohms

Question 2

An ordinary radio or telephone signal is an example of a(n) ___________ transmission.

Answer 2

analog

Question 3

A bus network has a(n) _____________ at each end.

Answer 3

terminator

Question 4

__________ cable is Teflon-coated and does not emit a toxic vapor when burned.

Answer 4

Plenum

Question 5

____________ is a network communication technique that uses a dedicated channel to transmit information between two nodes.

Answer 5

Circuit switching

Question 6

Sets standards for modems, e-mail, and digital telephone systems.

Answer 6

ITU

Question 7

Develops standards for electrical interfaces, such as serial interfaces on computers.

Answer 7

EIA

Question 8

Works with U.S. businesses, government agencies, and international groups to achieve agreement on standards for products ranging from bicycle helmets to communications cable.

Answer 8

ANSI

Question 9

A nongovernmental organization that promotes international cooperation and standards in science, technology, commerce and intellectual discovery.

Answer 9

ISO

Question 10

Develops telecommunications and cabling standards.

Answer 10

TIA

Question 11

Responsible for the 802 standards.

Answer 11

IEEE

Question 12

Focuses on technical Internet issues such as routing.

Answer 12

IETF

Question 13

Developed in the 1990s as a way to realistically implement portions of the X.500 standard.

Answer 13

LDAP

Question 14

Coordinates domain naming.

Answer 14

ICANN

Question 15

___________ cable is usually glass.

Answer 15

Fiber-optic

Question 16

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.

Answer 16

active monitor

Question 17

The bottom layer of the OSI model.

Answer 17

Physical Layer

Question 18

Whenever you use an Internet browser, you are working through this layer.

Answer 18

Session Layer

Question 19

This layer establishes the level of packet error checking.

Answer 19

Transport Layer

Question 20

The task of this layer is to organize bits so that they are formatted into frames.

Answer 20

Data Link Layer

Question 21

This layer is responsible for data encryption.

Answer 21

Presentation Layer

Question 22

This layer ensures that data is sent and received in the same order.

Answer 22

Transport Layer

Question 23

This is the layer computer programmers use to connect workstations to network services.

Answer 23

Application Layer

Question 24

This layer determines how long a node can transmit and how to recover from transmission errors.

Answer 24

Session Layer

Question 25

This layer controls the passage of packets along the network.

Answer 25

Network Layer

Question 26

Regional telephone companies are also called__________ or regional bell operating companies (RBOCs).

Answer 26

telcos

Question 27

____________ 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.

Answer 27

Ethernet SNAP

Question 28

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.

Answer 28

power budget

Question 29

___________ are logical communication paths set up to send and receive data.

Answer 29

Virtual circuits

Question 30

A(n) _________ cable is a cable that consists of a single cable sheath containing a combination of fibers and copper cables.

Answer 30

hybrid fiber/coax

Question 31

The impedance of 10BaseT UTP ethernet cable is ___________.

Answer 31

100 ohms

Question 32

The EIA/TIA-568 standard specifies that ___________ cabling be used to connect workstations and servers in the work area.

Answer 32

horizontal

Question 33

Attenuation in fiber-optic cable is measured in _________.

Answer 33

decibels

Question 34

A(n) ________ typically contains a fixed amount of data formatted to be transmitted at high speeds, from 155 Mbps to over 1 Gbps.

Answer 34

cell

Question 35

Modern networks combine the logical communications of a(n) ________ with the physical layout of a(n) ____________________.

Answer 35

bus, star

Question 36

The __________ is the total amount of communications cable that makes up a network.

Answer 36

cable plant

Question 37

When using _________, it is possible for several frames from several nodes to be on the network at a given time.

Answer 37

FDDI

Question 38

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.

Answer 38

multiplexer

Question 39

____ establishes a dedicated logical circuit between the two transmitting nodes.

Answer 39

Packet switching

Question 40

Category ____ twisted-pair cable has a transmission rate of 1000 Mbps.

Answer 40

6 and 5e

Question 41

A(n) ______ is software that enables a computer to communicate with devices such as NICs, printers, monitors, and hard disk drives.

Answer 41

driver

Question 42

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.

Answer 42

T-carrier

Question 43

____ encoding simply checks for a change in the signal state, from low to high or high to low.

Answer 43

State-transition

Question 44

____ cable does not experience EMI or RFI.

Answer 44

Fiber-optic cable

Question 45

The "A" in AUI stands for ____.

Answer 45

attachment

Question 46

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 ____.

Answer 46

service data unit