Block 2 - Unit 4

Question 1

_______ convert digital data to analog signals for transmission over a telephone line.

Answer 1

modems

Question 2

Which converter changes analog signals to a digital (binary) representation?

Answer 2

A/D converter

Question 3

The ________ converter converts a set of binary numbers into a specific voltage proportional to the binary number.

Answer 3

D/A converter

Question 4

_______ _______ converters connect various types of cables that exist within a network.

Answer 4

Network media

Question 5

A _____________ acts as a translator between two computers or networks that use different operating systems.

Answer 5

gateway

Question 6

__________ filter packets between LAN segments.

Answer 6

switches

Question 7

Switches read the __________ address of each packet and forward the packet to the correct port.

Answer 7

MAC address

Question 8

The switching technique that checks the first 64 bytes of a frame for fragmentation before forwarding the frame is called ____________.

Answer 8

fragmentfree

Question 9

The switching technique that stores the packet and performs an error check is the ________ ___ _________.

Answer 9

Store-and-forward

Question 10

A __________ connects two or more LAN segments to make those segments one logical network.

Answer 10

bridge

Question 11

Bridges forwards frames (or packets) of data based on the __________ _________ of the destined node.

Answer 11

MAC address

Question 12

If the MAC address of the destined node is on the same segment, the data __________ cross the bridge.

Answer 12

Does not

Question 13

Routers operate at what layer of the OSI reference model?

Answer 13

Network layer or layer 3

Question 14

A router uses the __________ __________ information found in the network area of the data packet to determine where to forward a packet.

Answer 14

Network address

Question 15

What devices are able to perform a dynamic load balance of communications traffic when alternative routes are available between networks?

Answer 15

routers

Question 16

Wideband encryption devices encrypt data from ____________.

Answer 16

Many types of equipment.

but really only computer data

Question 17

Narrowband encryption devices encrypt information from ___________.

Answer 17

telephones

Question 18

Bulk encryption is a _____________ line obtained by combining multiple signals.

Answer 18

Multiplexed

Question 19

Coaxial cable, twisted-pair cable, and/or fiber optic cable are examples of _________ __________.

Answer 19

Guided media

Question 20

Coaxial cable used in Ethernet 10Base5 networks is known as ___________.

Answer 20

thicknet

Question 21

Coaxial cable used in Ethernet 10Base 2 networks is known as ___________.

Answer 21

thinnet

Question 22

The two types of twisted pair cable are ____________ and _____________.

Answer 22

Shielded twisted-pair (STP) and unshielded twisted-pair (UTP)

Question 23

Shielded twisted pair (STP) cables are __________ to reduce noise both from inside and outside the cable.

Answer 23

Shielded

Question 24

___________ is the most popular type of network cable.

Answer 24

UTP

Question 25

Category ___________ UTP is not suitable for data transmission.

Answer 25

Cat 1

Question 26

Category ___________ UTP is rated for data transmission speeds up to 100Mbps.

Answer 26

Cat 5

Question 27

Fiber optic cables are immune to all types of EMF monitoring. (T/F)

Answer 27

True

Question 28

Which guided media supports the longest segment length?

Answer 28

Single-mode fiber - SMF

Question 29

Two types of unguided media are ____________ and ___________.

Answer 29

Light transmissions and radio waves

Question 30

One problem with light transmissions is __________ conditions, such as fog, can degrade the signal.

Answer 30

atmospheric

Question 31

Freedom of movement or ___________ is an advantage of unguided/unbound media.

Answer 31

mobility

Question 32

Three disadvantages of unguided/unbound media are ___________, ___________, and __________.

Answer 32

Security, distortion and interference, and speed

Question 33

TDM involves the distribution of __________ signals in the time domain.

Answer 33

multiple

Question 34

A multiplexer combines several ________ or __________ signals for transmission over one single medium.

Answer 34

Data or voice

Question 35

The primary purpose of using a multiplexer is to save on ________ ___________.

Answer 35

communication costs

Question 36

Multiplexers use an error detection/correction scheme to ensure the ____________ of the transmitted data.

Answer 36

integrity

Question 37

In order to tap into a multiplexed signal a person would have to know ________, _______, and _________________.

Answer 37

Link protocol, the individual channel assignment and the data formats

Question 38

Wave division multiplexing combines several different data signals onto a single ___________ ___________ cable.

Answer 38

Fiber optic

Question 39

Light signals are multiplexed by an ___________ _____________.

Answer 39

Optical combiner

Question 40

The demultiplexer uses a _____________ ____________ to split the light into many channels.

Answer 40

Light splitter

Question 41

Time division multiplexing (TDM) involves the distribution of multiple signals in a time domain. (T/F)

Answer 41

true

Question 42

Time division multiplexing (TDM) transmits a fixed sequence of time slots over a __________ transmission channel.

Answer 42

single

Question 43

Each user in TDM is assigned a specific _____ ______.

Answer 43

Time slot

Question 44

If a user has no data to send using TDM, the user time slot __________ __________.

Answer 44

Stays empty

Question 45

Which switching method check the CRC computation?

Answer 45

Store-and-forward

Question 46

Which type of server acts as a workstation and a server?

Answer 46

Peer-to-peer