Block 2 - Unit 4 Flashcards Preview

IT Fundamentals 2 AF > Block 2 - Unit 4 > Flashcards

Flashcards in Block 2 - Unit 4 Deck (46)
Loading flashcards...
1
Q

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

A

modems

2
Q

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

A

A/D converter

3
Q

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

A

D/A converter

4
Q

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

A

Network media

5
Q

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

A

gateway

6
Q

__________ filter packets between LAN segments.

A

switches

7
Q

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

A

MAC address

8
Q

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

A

fragmentfree

9
Q

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

A

Store-and-forward

10
Q

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

A

bridge

11
Q

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

A

MAC address

12
Q

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

A

Does not

13
Q

Routers operate at what layer of the OSI reference model?

A

Network layer or layer 3

14
Q

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

A

Network address

15
Q

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

A

routers

16
Q

Wideband encryption devices encrypt data from ____________.

A

Many types of equipment.

but really only computer data

17
Q

Narrowband encryption devices encrypt information from ___________.

A

telephones

18
Q

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

A

Multiplexed

19
Q

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

A

Guided media

20
Q

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

A

thicknet

21
Q

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

A

thinnet

22
Q

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

A

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

23
Q

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

A

Shielded

24
Q

___________ is the most popular type of network cable.

A

UTP

25
Q

Category ___________ UTP is not suitable for data transmission.

A

Cat 1

26
Q

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

A

Cat 5

27
Q

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

A

True

28
Q

Which guided media supports the longest segment length?

A

Single-mode fiber - SMF

29
Q

Two types of unguided media are ____________ and ___________.

A

Light transmissions and radio waves

30
Q

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

A

atmospheric

31
Q

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

A

mobility

32
Q

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

A

Security, distortion and interference, and speed

33
Q

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

A

multiple

34
Q

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

A

Data or voice

35
Q

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

A

communication costs

36
Q

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

A

integrity

37
Q

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

A

Link protocol, the individual channel assignment and the data formats

38
Q

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

A

Fiber optic

39
Q

Light signals are multiplexed by an ___________ _____________.

A

Optical combiner

40
Q

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

A

Light splitter

41
Q

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

A

true

42
Q

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

A

single

43
Q

Each user in TDM is assigned a specific _____ ______.

A

Time slot

44
Q

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

A

Stays empty

45
Q

Which switching method check the CRC computation?

A

Store-and-forward

46
Q

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

A

Peer-to-peer