Ch. 14 Packet

Question 1

Which device takes a circuit and combines it with a few hundred other circuits into a single complex circuit on one wire?

Answer 1

Multiplexer

Question 2

Which technology is used by multiplexers to separate individual voice calls by keeping every call in its own unique frequency range?

Answer 2

Frequency division multiplexing (FDM)

Question 3

Which digital signal rate does a central office use to convert analog voice signals before multiplexing them into larger circuits?

Answer 3

DS0

Question 4

Which device converts an analog signal to digital and a digital signal to analog?

Answer 4

Modulator-demodulator

Question 5

How many copper wires are used by a T1 line?

Answer 5

two pairs

Question 6

Which device connects to each end of a T1 connection?

Answer 6

CSU/DSU

Question 7

Which digital signal rate is used by a T1 line?

Answer 7

DS1

Question 8

Which digital signaling rate has a frame containing a framing bit and 24 channels where each channel holds a single 8-bit DS0 data sample?

Answer 8

DS1

Question 9

What is the data transfer speed for DS1?

Answer 9

1.544 Mbps

Question 10

How many channels are in a T1 bundle?

Answer 10

24

Question 11

What is the European counterpart to a T1 line?

Answer 11

E1

Question 12

What is the approximate total bandwidth of an E3 line?

Answer 12

34 Mbps

Question 13

What is the low end speed of the SONET Optical Carrier specification (OC-1)?

Answer 13

51.8 Mbps

Question 14

Which term refers to the first generation of packet-switching technology?

Answer 14

X.25

Question 15

Which term refers to a technology that serves as a replacement for Frame Relay and ATM switching?

Answer 15

Multi-Protocol Label Switching (MPLS)

Question 16

What is the range of transfer speed for ATM?

Answer 16

155.52 to 622.08 Mbps and beyond

Question 17

What is the size of an ATM fixed-length cell?

Answer 17

53 bytes

Question 18

Which test should a network administrator run on a CSU/DSU to test a WAN connection and verify the T-carrier connection from end to end?

Answer 18

BERT

Question 19

Which phone line has a baud rate of 2,400 and uses an RJ-11 connector?

Answer 19

PSTN

Question 20

Which device takes 8-bit-wide digital data, converts it into 1-bit-wide digital data, and then hands it to a modem for conversion to analog?

Answer 20

UART

Question 21

What is the current modem standard now on the market?

Answer 21

V.92

Question 22

When you install an ISDN terminal adapter (TA), what special number provided by the telephone company must be configured along with the other ISDN telephone number you want to call?

Answer 22

Service Profile ID (SPID)

Question 23

Which statement describes an ISDN PRI?

Answer 23

ISDN PRI is a full T1 line, carrying 23 B channels.

Question 24

Which terms refer to versions of DSL service?

Answer 24

SDSL and ADSL

Question 25

Which term describes a DSL device that is located in a central office, connecting multiple DSL customers to the Internet?

Answer 25

DSLAM

Question 26

What is the maximum distance between a user’s demarc and the central office for all versions of DSL?

Answer 26

18,000 feet

Question 27

In the most common DSL connection, what device is connected to a telephone wall jack and to a standard NIC in your computer?

Answer 27

DSL modem

Question 28

If you have cable Internet service, what protocol is used between the head end connection and the cable company’s network?

Answer 28

DOCSIS

Question 29

Long Term Evolution (LTE) networks feature speeds (in theory) of up to __________ Mbps for downloads and 75 Mbps for uploads.

Answer 29

300

Question 30

Which technology tries to bring usable Internet access to homes and businesses through the electrical power grid?

Answer 30

BPL

Question 31

To make rollouts affordable, most fiber-to-the-home technologies employ a version of __________ architecture that uses a single fiber to the neighborhood switch and then individual fiber runs to each final destination.

Answer 31

PPPF

Question 32

Which standard, developed by Citrix, is used with a remote terminal connection?

Answer 32

ICA

Question 33

Which term refers to the standard used by the vast majority of VoIP solutions?

Answer 33

RTP

Question 34

Which protocol is commonly used to stream video?

Answer 34

RTSP