New chapter 3- tm quizz

Flashcard 1
Q: In a wired network, which technique reduces the number of required cables while providing better utilization of the cables that are used?
A: Packet switching

Flashcard 2
Q: What broadcasts in the LF band?
A: WWVB

Flashcard 3
Q: Which agency is responsible for assigning and regulating radio frequencies in the United States?
A: FCC

Flashcard 4
Q: How does packet switching allow access to the network?
A: Packets can be sent by any device as long as no other device is sending a packet.

Flashcard 5
Q: What causes crosstalk?
A: Signals from one frequency encroaching on its neighbor's channel frequency

Flashcard 6
Q: What does a mixer do?
A: It converts an input frequency to a specific desired output frequency by combining it with a carrier frequency.

Flashcard 7
Q: This organization focuses on telecommunication signals.
A: ITU-T

Flashcard 8
Q: Which statement is true regarding multiple access methods?
A: Longer CDMA spreading codes allow more users to share the frequency band.

Flashcard 9
Q: Which data flow requires two frequency channels?
A: Full-duplex transmission

Flashcard 10
Q: How does CDMA provide multiple access?
A: It uses a different PN code for each user.

Flashcard 11
Q: How does TDMA provide multiple access?
A: It divides the transmission time into several slots, and gives each user a different time slot.

Flashcard 12
Q: What prevents CDMA devices from intercepting each other's signals?
A: Without knowledge of the correct PN code and the starting chip, others' transmissions will appear to be random noise.

Flashcard 13
Q: This blocks frequencies below a minimum threshold and above a maximum threshold.
A: Bandpass filter

Flashcard 14
Q: What standards are developed by IETF?
A: Internet protocols

Flashcard 15
Q: The FCC approved the use of unlicensed spectrum in the 6 GHz band in April 2020 for wireless communication. 6 GHz is in which band?
A: SHF (Super High Frequency)

Flashcard 16
Q: Which radio system component is an active device?
A: Amplifier

Flashcard 17
Q: What are de facto standards?
A: Common practices that the industry simply followed without being created by a standards organization.

Flashcard 18
Q: How many filters are used when transmitting an AM signal, and why?
A: Two filters: one to the IF signal to eliminate undesirable harmonics, and one to the mixer output to eliminate frequencies outside the intended sideband limits.

Flashcard 19
Q: This organization writes regulations rather than standards:
A: FCC

Flashcard 20
Q: How does FDMA provide multiple access?
A: It divides the bandwidth into several smaller frequency bands or channels, and then dedicates each channel to a specific user.

Flashcard 21
Q: WLANs do NOT operate in which band?
A: Millimeter Wave

Flashcard 22
Q: Mixers are used to convert an input frequency to a specific desired output frequency. Where does a mixer fit within the components of a radio transmitter circuit?
A: Modulator, Filter, Mixer, Filter, Amplifier, Antenna

Flashcard 23
Q: This switching method gives two users a dedicated connection, but only as long as needed.
A: Circuit switching

Flashcard 24
Q: What do standards allow you to do?
A: Connect devices from multiple vendors on the same network, such as PCs running Windows, Macs running macOS, iPhones running iOS, and mobile devices running Android.

Flashcard 25
Q: What do the IEEE 802.3 standards cover?
A: Ethernet

• Defines the physical and data link layers for wired Ethernet connections, enabling reliable local area networking.