Final Exam

Question 1

The radio propagation characteristics are similar for all frequencies associated with 5G NR

Answer 1

False

Question 2

In 5G New Radio traditional MIMO is used to improve reception due to multipath signals.

Answer 2

True

Question 3

In 5G NR, the uplink data rate is signficantly higher than the downlink.

Answer 3

False

Question 4

How many System Information Broadcast (SIB) message types are there, excluding the master information block.

Answer 4

9

Question 5

TDD air interface milimeter wave bands (FR2) have carrier bandwidths that are _____ than those in FR1

Answer 5

larger

Question 6

What is one of the major reasons that the Cloud Native 5G Core is easier to scale than earlier generations?

Answer 6

Software moved from running directly on server hardware to being executed in virtual machines

Question 7

5G NR Non-Standalone (NSA) networks use _____ as the anchor for signaling and user data while the 5G NR part is only used for user data.

Answer 7

LTE

Question 8

FR2 capable devices require a separate dedicated ____

Answer 8

antenna

Question 9

In practice, downlink data transfers usually use a split-bearer where data are transferred on _____ and ____ simultaneously.

Answer 9

LTE and NR

Question 10

____ is currently the dominant 5G network configuration.

Answer 10

NSA

Question 11

Devices can reserve the air interface prior to transmission of a data frame.

Answer 11

True

Question 12

Authentication and encryption are not independent of each other.

Answer 12

False

Question 13

Wifi is a set of product compatibility standards for wireless local area networks (WLAN) based on the IEEE 802.11 specifications.

Answer 13

True

Question 14

What are some characteristics of a Basic Service Set (BSS) WLAN system?

Answer 14

1. Data are not exchanged between client devices
2. Access point usually also acts as a bridge to a fixed line ethernet.

Question 15

Which action triggers a mobile device to enter the power save mode in order to conserve energy while no data are transferred?

Answer 15

An empty frame has to be sent by the mobile device to the access point, which has the power save bit set to ‘1’ in the header of the frame.

Question 16

Because the air interface is unreliable transmission medium in a WLAN, ______ frames are transmitted.

Answer 16

Acknowledgement

Question 17

How can a receiving device detect the speed at which the payload part of a frame was sent?

Answer 17

The PLCP header of a WLAN frame is always sent at a data rate of 1 mbps.

Question 18

_____ is a BSS technique to ensure the ACK will be sent before another device attempts to send a new data frame.

Answer 18

DCF (Distributed Coordination Function)

Question 19

The 802.11g (and later) standard uses the ______ mechanism to reserve the air interface prior to transmission of a data frame.

Answer 19

RTS (Ready to Send)/CTS (Clear to Send)

Question 20

In BSS architecture, authentication and _______ are independent of each other.

Answer 20

Encryption

Question 21

Bluetooth users cannot establish “trusted devices” that can exchange data without asking their permission

Answer 21

False

Question 22

L2CAP layer does not provide segmentation of the higher-layer data packets

Answer 22

False

Question 23

Each bluetooth device contains a service database that can be queried by other devices.

Answer 23

True

Question 24

What are characteristics of the Synchronous Connection Oriented (SCO) channel?

Answer 24

1. Allocates fixed bandwidth between point-to-point connection involving master and single slave
2. Used to exchange time-bounded data requiring guaranteed data rate without guaranteed delivery.
3. Master maintains SCO by using reserved slots at regular intervals.

Question 25

The RFCOMM layer offers a virtual serial interface to _______ and _______.

Answer 25

1. Simplify data transfer 2. Any non-Bluetooth application

Question 26

________ in Bluetooth is performed using a challenge/response procedure.

Answer 26

Authentication.

Question 27

Which class of Bluetooth transmitter is most common in mobile devices?

Answer 27

Class 3

Question 28

The _____ Bluetooth adopted protocol is a session level protocol developed by Infrared Data Association (IrDA) for exchange of objects.

Answer 28

OBEX (Object Exchange Protocol)

Question 29

A _____ procedure is used to directly establish contact with a Bluetooth device which is already known.

Answer 29

Paging

Question 30

In Security mode ____ the user decides if authentication, ciphering, and authorization are necessary when a service is used.

Answer 30

2

Question 31

What is CORESET

Answer 31

List of areas inside the BWP of a device in which the PDCCH is placed

Question 32

A device can be assigned one or more control regions that have to be placed inside its bandwidth parts

Answer 32

True

Question 33

What is Spectrum Refarming?

Answer 33

Process of replacing legacy air interface technologies with a new one

Question 34

What is a Bandwidth Part (BWP)?

Answer 34

A bandwidth part only allows a fraction of the 5G carrier

Question 35

Why can the 4G and 5G part of a 5G NSA bearer be handed over independently from each other?

Answer 35

Because the control links between 4G and 5G are already segregated.

Question 36

What is 5G network slicing?

Answer 36

The use of network virtualization to divide single network connections into multiple virtual connections that provide different resources to different types of traffic

Question 37

What is the difference between Ad Hoc and BSS mode?

Answer 37

Ad Hoc is a temporary peer-to-peer network with no centralized device. Devices are configured IP manually. BSS uses an AP as a central communication point. Users are not exchanging data in this mode. DHCP server is used for IP configuration.

Question 38

What is an SSID and which frames is it used in?

Answer 38

An SSIDs is a Service Set ID that is used to identify a wireless network. They are broadcast in beacon frames.

Question 39

What is the max transfer rate that can be reached in a data transfer between two 802.11g devices in a BSS?

Answer 39

12 Mbps

Question 40

What is WiFi?

Answer 40

A set of product compatibility standards for WLAN based on the IEEE 802.11 specifications

Question 41

Stations that locate APs by transmitting a probe request use _______.

Answer 41

Active scanning

Question 42

Stations that wait to receive a beacon frame from an AP use _______.

Answer 42

Passive scanning

Question 43

What is the concept of the Service Discovery Database?

Answer 43

It's a database that offers a multitude of services offered by a Bluetooth device

Question 44

_____ is a standard developed by a group of electronics manufacturers that allows any sort of electronic equipment to make its own connections, without wires, cables or any direct action from a user.

Answer 44

Bluetooth

Question 45

The _____ procedure is invoked to search for any unknown Bluetooth devices in the area.

Answer 45

Inquiry

Question 46

_____ sends each packet on a different channel (frequency)

Answer 46

FHSS

Question 47

_____ provides connection-oriented and connectionless data services to upper layer protocols with protocol multiplexing capability, segmentation and reassembly operation, and group abstractions

Answer 47

L2CAP

Question 48

Security mode ___ is used for a service that does not have authentication and the connection is not encrypted.

Answer 48

1