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.

Accepted Answer

V.44 is not a modulation protocol for analog modems. The best choice would be D) V.92, which is the most recent and includes features such as modem-on-hold and quick connect. It is also compatible with older standards like V.90 and V.34, which may be necessary depending on the specific point-of-sale device being used.

Question 2

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

Accepted Answer

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?

Accepted Answer

D

Question 4

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

Accepted Answer

Hardware flow control uses dedicated hardware signals, not special characters, to control the flow of data.

Question 5

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

Accepted Answer

This statement is false. Digital technologies are generally preferred over analog modems due to their faster speeds and more reliable connections. The only reason someone may choose to use an analog modem instead of a digital technology could be due to a lack of access to digital infrastructure.

Question 6

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

Accepted Answer

Disallowing all incoming packets would make it impossible to access the internet at all. Instead, it is suggested to use MAC address filtering, disable SSID display, and enable the firewall to secure a wi-fi connection.

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?

Accepted Answer

Cable modems provide the highest bandwidth connections among the given options. Cable modems use the same coaxial cables that deliver cable TV signals to provide high-speed Internet access, which can offer download speeds anywhere from 10 Mbps to 1 Gbps. ISDN PRI, ADSL, and SDSL offer comparatively lower bandwidth connections.

Question 8

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

Accepted Answer

Option D is not a valid consideration as DSL connections can be set up with a router that allows multiple users to access the internet simultaneously. The other options are valid considerations as DSL lines are dedicated to a single customer, ADSL provides faster downstream than upstream data rate and DSL subscribers do not share the bandwidth with other subscribers.

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?

Accepted Answer

Ctrl-S is typically used for software flow control, where it signifies a request to pause transmission. Similarly, Ctrl-Q is used to resume transmission. Ctrl-F, Ctrl-O, and Ctrl-V are not generally utilized for flow control.

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?

Accepted Answer

ISDN allows for both voice and data connections to be made simultaneously over the same line. Option A is incorrect as ISDN connections allow multiple devices to be connected through the use of a router. Option B is incorrect as this is the data rate for T1 lines, while BRI has a data rate of 128Kbps. Option C is also incorrect as ISDN works over copper lines as well as fiber optic lines.

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?

Accepted Answer

excessively bright sunlight is not likely to be the cause of a satellite internet connection problem, as satellite transmissions are not affected by sunlight. Severe rain storms, snow on the dish, and heavy satellite usage can all cause issues with the connection.

Question 12

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

Accepted Answer

Mac OS X uses the Network preferences pane, not a tool specifically called "Network Connection," for configuring modems and other network connections.

Question 13

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

Accepted Answer

The v.42 standard is used for error checking in modems. The v.92bis, v.90, and v.32bis standards relate to other modem features such as data compression and connection rates.

Question 14

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

Accepted Answer

The Network and Sharing Center in Windows Vista and Windows 7 provides options to set up various types of network connections, including dial-up connections.

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?

Accepted Answer

The "atdt" command is used to dial a phone number with a modem. To account for the delay in the hotel phone system, the comma (",") can be used to insert a pause. Therefore, the correct command would be "atdt 9,9285551932".

Question 16

Which of the following is true about cable modem connections.

Accepted Answer

DOCSIS 3.0 allows for channel bonding, which means multiple channels can be combined to increase download and upload speeds.

Answer: B
 Upstream data rates are usually lower than downstream data rates in cable modem connections because cable providers allocate more bandwidth to downstream data.

Answer: C
 Although DOCSIS 3.0 provides increased speed, it does not provide added security on its own. Additional security measures must be taken to ensure a secure connection.

Answer: D
 Cable modem connections are not dedicated lines, meaning that bandwidth is shared among multiple users in a given area which affects speed and connection quality.

Question 17

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

Accepted Answer

On-the-fly compression of data on modems is typically achieved using algorithms like LZJH, which compresses data before transmitting it and then decompresses it on the receiving end. PKZIP is a file compression program that works on individual files but not on "live" data streams like those transmitted by modems. TAR-Z is a file archiving format, and TIFF is an image file format, neither of which are relevant to data compression on modems.

Question 18

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

Accepted Answer

Satellite Internet connection uses a satellite dish, a digital modem, and a USB cable to connect to a computer. Twisted-pair cable is not used in a typical satellite Internet connection.

Question 19

A digital modem does not modulate/demodulate signals.

Accepted Answer

A digital modem does not modulate/demodulate signals, it converts digital signals into analog signals and vice versa.

Question 20

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

Accepted Answer

CSMA/CD is a component of network communication protocols, not analog modem technology. UART (Universal Asynchronous Receiver/Transmitter), data pump, and controller are all components found in analog modems.

Quiz 8: Modem and Other Remote Communications Devices