Cisco 1 - Networking Basics Perrine. J Page 110/16/2015 Chapter 4 Which of the following best describes a digital signal? 1.A sine wave of normal shape

Cisco 1 - Networking Basics

Perrine. J Page 104/20/23

Chapter 4

Which of the following best describes a digital signal?

1. A sine wave of normal shape and amplitude

2. An electrical technique that is used to convey binary signals

3. A language of computers with only two states –on and off-that are indicated by a series of voltage pulses

4. A transmission that a transceiver sends back to a controller to let it know the collision circuitry is functional.



Chapter 4

Which of the following best describes a digital signal?

1. A sine wave of normal shape and amplitude

2. An electrical technique that is used to convey binary signals

3. A language of computers with only two states –on and off-that are indicated by a series of voltage pulses

4. A transmission that a transceiver sends back to a controller to let it know the collision circuitry is functional.



Chapter 4

Which of the following units of measure are commonly used in formulas for calculating the amount of gain or loss in networking signals? (Choose three.)

1. watts

2. ohms

3. volts

4. decibels

5. joules

6. amperes



Chapter 4

Which of the following units of measure are commonly used in formulas for calculating the amount of gain or loss in networking signals? (Choose three.)

1. watts

2. ohms

3. volts

4. decibels

5. joules

6. amperes



Chapter 4

Which of the following are true about square waves? (Choose three.)

1. They repeat the same pattern at regular intervals.

2. They continuously vary with time.

3. They repeat the flat pattern on both the top and bottom of the wave.

4. They do not continuously vary with time.

5. They occur naturally and change regularly over time.

6. They change intervals based upon voltage.



Chapter 4

Which of the following are true about square waves? (Choose three.)

1. They repeat the same pattern at regular intervals.

2. They continuously vary with time.

3. They repeat the flat pattern on both the top and bottom of the wave.

4. They do not continuously vary with time.

5. They occur naturally and change regularly over time.

6. They change intervals based upon voltage.



Chapter 4

What is a cost-effective way to limit cable signal degradation?

1. Specify the maximum cable length between nodes.

2. Increase the size of the conductors in the cabling.

3. Improve the type of insulation material

4. Use a braid or foil covering on wires as a shield



Chapter 4

What is a cost-effective way to limit cable signal degradation?

1. Specify the maximum cable length between nodes.

2. Increase the size of the conductors in the cabling.

3. Improve the type of insulation material

4. Use a braid or foil covering on wires as a shield



Chapter 4

What is the purpose of shielding in copper based media? (Choose three.)

1. protect one pair of wires within the cable from noise generated by electrical signals on another pair of wires

2. ground the cable and prevent electrical shocks

3. protect the data signal from external sources of noise

4. eliminate signal loss by keeping the transmitted signal confined to the cable

5. decrease attenuation and increase the length possible for the cable run

6. ground the cable so that the zero volt reference point is accurate



Chapter 4

What is the purpose of shielding in copper based media? (Choose three.)

1. protect one pair of wires within the cable from noise generated by electrical signals on another pair of wires

2. ground the cable and prevent electrical shocks

3. protect the data signal from external sources of noise

4. eliminate signal loss by keeping the transmitted signal confined to the cable

5. decrease attenuation and increase the length possible for the cable run

6. ground the cable so that the zero volt reference point is accurate



Chapter 4

For which type of waves would the signal gain or loss be calculated using the power formula? (Choose two.)

1. electromagnetic waves on copper cables

2. electrical waves on copper cables

3. light waves on optical fiber

4. radio waves in the air

5. sound waves in the air



Chapter 4

For which type of waves would the signal gain or loss be calculated using the power formula? (Choose two.)

1. electromagnetic waves on copper cables

2. electrical waves on copper cables

3. light waves on optical fiber

4. radio waves in the air

5. sound waves in the air



Chapter 4

Identify common ways in which the capacities of communication systems are measured? (Choose two.)

1. analog bandwidth

2. resistance capacity

3. carrier bandwidth

4. polarity capacity

5. digital bandwidth



Chapter 4

Identify common ways in which the capacities of communication systems are measured? (Choose two.)

1. analog bandwidth

2. resistance capacity

3. carrier bandwidth

4. polarity capacity

5. digital bandwidth



Chapter 4

How is the signal reference ground established?

1. By connecting the ground wire to the network wire

2. By connecting the network wire to the jumper connector

3. By connecting the ground plane to the computer’s cabinet

4. By connecting the computer chassis to the network cable



Chapter 4

How is the signal reference ground established?

1. By connecting the ground wire to the network wire

2. By connecting the network wire to the jumper connector

3. By connecting the ground plane to the computer’s cabinet

4. By connecting the computer chassis to the network cable



Chapter 4

Which of the following are possible sources of line noise? (Choose three.)

1. radio transmitters

2. electrical motors

3. crosstalk

4. laser light

5. incandescent light



Chapter 4

Which of the following are possible sources of line noise? (Choose three.)

1. radio transmitters

2. electrical motors

3. crosstalk

4. laser light

5. incandescent light



Chapter 4

What problems are associated with impedance mismatches in copper cabling? (Choose two.)

1. jitter

2. signal absorption

3. termination of signals

4. reflection

5. NEXT



Chapter 4

What problems are associated with impedance mismatches in copper cabling? (Choose two.)

1. jitter


3. termination of signals

4. reflection

5. NEXT



Chapter 4

Which of the following are tests specified by the TIA/EIA-568-B standard for copper cable? (Choose three.)

1. signal harmonics

2. cable length

3. wire map


5. conductive response

6. propagation delay



Chapter 4

Which of the following are tests specified by the TIA/EIA-568-B standard for copper cable? (Choose three.)

1. signal harmonics

2. cable length

3. wire map


5. conductive response

6. propagation delay



Chapter 4

How can the problem of electrical noise be avoided?

1. By installing surge suppressors on every network device

2. By making sure all electrical devices are FCC and UL listed

3. By getting a single power transformer dedicated to your LAN

4. By limiting the number and type of electrical devices near the LAN



Chapter 4

How can the problem of electrical noise be avoided?

1. By installing surge suppressors on every network device

2. By making sure all electrical devices are FCC and UL listed

3. By getting a single power transformer dedicated to your LAN

4. By limiting the number and type of electrical devices near the LAN



Chapter 4

For what purpose are two y-axis inputs used when displaying voltage patterns on an oscilloscope?

1. to insure a clean signal is obtained

2. to determine if one is primary and one is backup

3. to display multiple time frames

4. to analyze a complex spectrum

5. to observe and measure two waves simultaneously



Chapter 4

For what purpose are two y-axis inputs used when displaying voltage patterns on an oscilloscope?

1. to insure a clean signal is obtained

2. to determine if one is primary and one is backup

3. to display multiple time frames

4. to analyze a complex spectrum

5. to observe and measure two waves simultaneously



Chapter 4

What type of analysis is performed by using an oscilloscope?

1. power-domain

2. frequency-domain

3. time-domain

4. wave-domain

5. spectrum-domain

6. signal-domain



Chapter 4

What type of analysis is performed by using an oscilloscope?

1. power-domain

2. frequency-domain

3. time-domain

4. wave-domain

5. spectrum-domain

6. signal-domain



Chapter 4

How are binary ones and zeros represented in fiber optic installations? (Choose two.)

1. +5 volts/-5 volts

2. 0 volts/5 volts

3. light/no light

4. high to low electrical transition

5. low to high electrical transition

6. increasing/decreasing light intensity



Chapter 4

How are binary ones and zeros represented in fiber optic installations? (Choose two.)

1. +5 volts/-5 volts

2. 0 volts/5 volts

3. light/no light

4. high to low electrical transition

5. low to high electrical transition

6. increasing/decreasing light intensity

Documents

Cisco 1 - Networking Basics Perrine. J Page 110/16/2015 Chapter 4 Which of the following best describes a digital signal? 1.A sine wave of normal shape