Deck 8: Modem and Other Remote Communications Devices

Question 1

You are configuring an analog modem for a point-of-sale device and are deciding which modulation protocol to choose. Which of the following is NOT one of your choices.

A) V.44
B) V.90
C) V.34
D) V.92

Answer 1

A

Question 2

Which of the following is true about using software-based modems?

A) they do not have a hardware UART
B) they use more memory and CPU cycles than hardware-based modems
C) the data pump is implemented as a software algorithm
D) they cannot transfer data as fast as hardware modems

Answer 2

B

Question 3

You are verifying a computer's parity checking by analyzing the bits received through a serial communication port. The system is set for even parity. Which of the following bit streams indicates a parity error?

A) 100100110
B) 110000101
C) 100000001
D) 111000011

Answer 3

D

Question 4

Hardware flow control halts and resumes the movement of data by sending special characters.

Question 5

Analog modems are used in preference to digital technologies,even where digital technologies are widely available.

Question 6

When accessing the Internet through a wi-fi connection,which of the following is NOT a suggested security measure you should follow?

A) use MAC address filtering
B) disallow all incoming packets
C) disable SSID display
D) enable the firewall

Question 7

You are weighing the benefits of the major communications technologies. Your main concern is having a high bandwidth connection to the Internet. Which of the following technologies provides the highest bandwidth connections?

A) ISDN PRI
B) Cable modem
C) ADSL
D) SDSL

Question 8

While considering whether to use DSL for an Internet connection,which of the following is NOT a valid consideration?

A) DSL lines are dedicated to a single customer
B) ADSL provides a faster downstream than upstream data rate
C) DSL subscribers do not share the bandwidth with other subscribers
D) only a single user can access the Internet through a DSL connection

Question 9

You are analyzing a serial communication session. You are able to view each character as it is transmitted and received. You suspect a problem with the software flow control. Which of the following characters is involved in software flow control?

A) Ctrl-S
B) Ctrl-F
C) Ctrl-O
D) Ctrl-V

Question 10

You are researching the possibility of upgrading your analog modem to ISDN. Which of the following is true about ISDN modems and connections?

A) you can only connect one device to an incoming line
B) the BRI has a data rate of 1.544 Mbps
C) ISDN works only on fiber optic lines
D) you can have a voice and data connection simultaneously

Question 11

You have been called to troubleshoot a satellite Internet connection. Based on your knowledge of how satellite communications work,which of the following is NOT likely to be the cause of the problem?

A) severe rain storms
B) snow on the dish
C) excessively bright sunlight
D) heavy satellite usage

Question 12

Mac OS X uses the Network Connection tool for configuring modems and other network connections.

Question 13

Which of the following standards is used my modems for error checking?

A) v.92bis
B) v.90
C) v.42
D) v.32bis

Question 14

The Network and Sharing Center is used in Windows Vista and Windows 7 OSs to set up a dial-up connection.

Question 15

You have a laptop with a built-in analog modem. You are at a hotel and must connect to the company network with the modem. The hotel phone system requires that you dial a 9 before the phone number. You have found that it takes a second or two to get a dial-tone after you dial the 9. What command should be used on the modem to dial the number: 928-555-1932?

A) dt 9285551932
B) dt 99285551932
C) atdt 9,9285551932
D) atdt 99285551932

Question 16

Which of the following is true about cable modem connections.

A) DOCSIS 3.0 combines multiple channels to increase speed
B) upstream data rates are always lower than downstream data rates
C) DOCSIS 3.0 provides added speed but not added security
D) your connection to the Internet through the cable provider is a dedicated line

Question 17

Data compression on modems is accomplished "on the fly" by using which of the following methods?

A) PKZIP
B) LZJH
C) TAR-Z
D) TIFF

Question 18

Which of the following is NOT a component in a typical satellite Internet connection?

A) satellite dish
B) twisted-pair cable from dish to modem
C) digital modem
D) USB cable from modem to computer

Question 19

A digital modem does not modulate/demodulate signals.

Question 20

Which of the following is NOT a component of an analog modem?

A) UART
B) CSMA/CD
C) data pump
D) controller

Question 21

MATCHING
a.flow control
b.cable modem
c.synchronous communication
d.data pump
e.daemon
f.protocol
g.ADSL
h.Xon-Xoff
i.modem
j.asynchronous communication
a high speed technology that can use ordinary telephone lines for downstream transmissions speeds up to 8 Mbps and upstream speeds up to 1 Mbps

Question 22

MATCHING
a.flow control
b.cable modem
c.synchronous communication
d.data pump
e.daemon
f.protocol
g.ADSL
h.Xon-Xoff
i.modem
j.asynchronous communication
a hardware device that permits a computer to exchange digital data with another computer via an analog telephone line or dedicated connection

Question 23

MATCHING
a.flow control
b.cable modem
c.synchronous communication
d.data pump
e.daemon
f.protocol
g.ADSL
h.Xon-Xoff
i.modem
j.asynchronous communication
a software flow control protocol that permits a receiving modem to notify the
sending modem that its data buffers are full

Question 24

MATCHING
a.flow control
b.cable modem
c.synchronous communication
d.data pump
e.daemon
f.protocol
g.ADSL
h.Xon-Xoff
i.modem
j.asynchronous communication
communications that occur in discrete units in which the start of a unit is signaled by a start bit at the front,and a stop bit at the back signals the end
of the unit

Question 25

____________ uses digital communications over a communications line and has an aggregate data rate of 144 Kbps or 1.544 Mbps

Question 26

MATCHING
a.flow control
b.cable modem
c.synchronous communication
d.data pump
e.daemon
f.protocol
g.ADSL
h.Xon-Xoff
i.modem
j.asynchronous communication
a digital modem device designed for use with the cable TV system providing
high-speed data transfer.

Question 27

When connecting to an analog modem using Windows XP,which of the following is a possible port name through which you communicate to the modem?

A) COM2
B) TTY0
C) LPT1
D) UART0

Question 28

A desktop computer with a modem is called a ________ device because it prepares data to be transmitted.

Question 29

Computers store data as a series of 1s and 0s represented by the presence or absence of _________.

Question 30

___________ checking is a data verification process that ensures data integrity through a system of data bit comparisons between the sending and receiving computer.

Question 31

MATCHING
a.flow control
b.cable modem
c.synchronous communication
d.data pump
e.daemon
f.protocol
g.ADSL
h.Xon-Xoff
i.modem
j.asynchronous communication
a hardware or software feature in modems that lets a receiving modem
communicate to the sending modem that it needs more time to process previously sent data

Question 32

What protocol does a dial-up networking connection use to access the ISP for Internet communications?

A) ISDN
B) UART
C) PPP
D) DOCSIS

Question 33

MATCHING
a.flow control
b.cable modem
c.synchronous communication
d.data pump
e.daemon
f.protocol
g.ADSL
h.Xon-Xoff
i.modem
j.asynchronous communication
an internal,automatically running program,usually in UNIX/Linux,that serves a particular function such as routing e-mail to recipients

Question 34

The _______ is a component of a modem that reads in one byte of data,adds a start and stop bit and feeds the bits to the port.

Question 35

MATCHING
a.flow control
b.cable modem
c.synchronous communication
d.data pump
e.daemon
f.protocol
g.ADSL
h.Xon-Xoff
i.modem
j.asynchronous communication
the hardware or software portion of a modem that is responsible for
converting digital data into analog signals for transmission over a telephone line

Question 36

You have arrived at a customer site who is having problems using a modem attached to his Linux server. The GUI is not installed on the server. Which command can you use to verify and configure the modem?

A) Network Connection tool
B) /dev/getty
C) ln -s /dev/ttys1
D) minicom

Question 37

In Unix/Linux,you refer to the first modem on the computer using which of the following?

A) /dev/ttys0
B) /dev/ttys1
C) /dev/com0
D) /dev/com1

Question 38

MATCHING
a.flow control
b.cable modem
c.synchronous communication
d.data pump
e.daemon
f.protocol
g.ADSL
h.Xon-Xoff
i.modem
j.asynchronous communication
communications of continuous bursts or blocks of data controlled by a clock signal that starts each burst or block of data

Question 39

MATCHING
a.flow control
b.cable modem
c.synchronous communication
d.data pump
e.daemon
f.protocol
g.ADSL
h.Xon-Xoff
i.modem
j.asynchronous communication
an established guideline that specifies how networked data,including data sent over a telephone network,is formatted into a transmission unit

Question 40

You have a Mac computer that you need to connect to the Internet. The only network connection available on the computer is a Bluetooth adapter. You are in range of a wi-fi hotspot that you have access to.What,if anything can you do to connect this computer to the Internet?

A) Put the Bluetooth adapter in wi-fi mode and connect to the wi-fi hotspot
B) configure a Bluetooth DUN on the Mac to use your Bluetooth phone's Internet connection
C) create a DUN using Network and Sharing Center and connect to your Bluetooth phone
D) connect to a DSL modem using Bluetooth and use PPPoE to access the Internet

Question 41

Describe how software flow control works.

Question 42

What are the two interfaces supported in ISDN and what are their respective data rates?

Question 43

What command would you send a Hayes compatible modem if you wanted the modem to ignore incoming calls?

Question 44

What is the difference between ADSL and SDSL?

Question 45

What is a winmodem and what is a disadvantage of using one?

Question 46

Name two enhancements of DOCSIS 3.0 over non-DOCSIS compliant cable modems?

Question 47

Briefly describe what a modem does.

Question 48

What task does the controller component in a modem perform?

Question 49

What type of signal is embedded in the data of synchronous communication lines?

Question 50

Briefly describe the role of the UART in a modem.