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WorksheetsCS314_Finals_Quiz-03
Total questions: 70
Worksheet time: 58mins
The device in a WiFi network that coordinates data transmissions and associations with clients is called an (a) .
The unique identifier used by WiFi networks for association is known as the (a) .
In the IEEE 802.11 protocol, the process of a device joining with an Access Point is called (a) .
The 32-bit field in WiFi frames used for error detection is called (a) .
When a device moves from one cell to another in a cellular network, it undergoes a process known as (a) .
In wireless networking, a group of devices communicating without a centralized access point forms an (a) network.
The MAC protocol for WiFi, which avoids collisions rather than detecting them, is called (a) .
The small control frames for reserving the WiFi channel in the presence of hidden terminals are named _______ and _______.
(a)
The frequency bands most commonly used by WiFi networks are _______ GHz and _______ GHz.
(a)
The protocol used in cellular networks to create tunnels for mobility management is called (a) .
In LTE, the network component that authenticates and authorizes users is called the (a) .
The process by which a WiFi device scans for APs using their beacon frames is known as (a) scanning.
The first step in a cellular device attachment phase involves connecting to a nearby (a) .
A wireless station that sends multiple copies of a frame differentiates these using the (a) field.
The technique that adapts the transmission rate of WiFi according to channel condition is called (a) .
The device responsible for maintaining QoS and scheduling in LTE networks is called (a) .
The field in 802.11 frames that specifies how long the channel will be reserved for transmission is (a) .
The authentication protocol leveraging MAC addresses for WiFi access is called (a) .
The main multiplexing technique used for downlink channels in LTE is (a) .
The higher-layer protocol that struggles with packet losses from wireless errors and handovers is (a) .
Which device coordinates wireless frame transmissions and manages associations in WiFi?
Switch
Repeater
Access Point
Wireless host
The process that allows a WiFi device to join a network is called:
Scanning
Routing
Association
Directional antenna
What is the purpose of the CRC field in wireless frames?
Routing data across networks
Detecting bit errors
Assigning channel number
Frame encryption
RTS/CTS frames are used primarily to:
Increase bit rate
Avoid collisions with hidden terminals
Assign MAC addresses
Change channel frequencies
Which multiplexing technique is standard in LTE for downlink channels?
Time-division multiplexing
Orthogonal frequency division multiplexing
Frequency-hopping
Signal segmentation
What key information is required for a WiFi device to associate with an AP?
Channel number
SSID
Router's IP
Network mask
Authentication in many companies' WiFi networks is handled by:
Username only
MAC address filtering and authentication server
SSID cloaking
Open access mode
In cellular networking, the handover process ensures:
Enhanced security
Session continuity while roaming between cells
Packet segmentation
Increased bandwidth
Why does WiFi use CSMA/CA instead of collision detection?
A. Wireless hardware cannot detect collisions reliably
B. To reduce protocol overhead
C. To maximize encryption
D. For ad hoc routing
In a WiFi jungle, devices typically select APs based on:
Beacon frame encryption
Highest received signal strength
Channel bandwidth
Least loaded network
What role does the Home Subscriber Server (HSS) play in LTE networks?
Schedules transmission slots
Authenticates and maintains subscriber data
Allocates frequency channels
Handles ARQ protocols
Split-TCP is used in wireless networks mainly to:
Increase encryption
Recover efficiently from wireless packet loss
Change SSIDs quickly
Prioritize beacon frames
Which frequency band is best for WiFi coverage at long distances with fewer obstructions?
2.4 GHz
5 GHz
900 MHz
60 GHz
WiFi access points broadcast ________ frames to advertise their presence.
Probe
Authentication
Beacon
Control
Frame sequence numbers in 802.11 are important because they help:
Detect retransmissions
Manage routing tables
Power sleep modes
The duration field in an 802.11 frame is used to:
Specify encryption attributes
Reserve the channel for a set transmission period
Indicate SSID length
Display MAC address format
Which is NOT a feature of an ad hoc wireless network?
No centralized AP
Central authentication
Self-routing
Dynamic association
LTE radio access network uses slot reallocation to:
Prioritize devices dynamically
Increase MAC address length
Encrypt sessions
Generate beacon frames
What is a likely consequence if the AP is overloaded with clients?
MAC address duplication
Reduced bandwidth per user
Increased SSID length
Channel re-selection
Why is ARQ protocol essential in WiFi?
It increases battery life
Performs reliable retransmission over error-prone channels
Changes frame format
Adjusts channel width
The MME in LTE networks is mainly responsible for:
QoS management
Handover, authentication, and mobility services
Channel partitioning
SSID allocation
Passive scanning in WiFi involves:
Listening for beacon frames from APs
Broadcasting association requests
Encrypting probe responses
Channel re-configuring
Which field distinguishes a typical WiFi frame from Ethernet?
Sequence number
Multiple MAC addresses
Duration field
Frame size
Handover in cellular networks is triggered when:
Beacon frame fails
Device moves to new cell
SSID changes
ARQ fails
In WiFi, the RTS/CTS mechanism may NOT be used if:
Frame length is below the RTS threshold
The MAC address changes
Signal is encrypted
Beacon scanning is active
What optimization occurs in LTE-Advanced for speed?
Frame encryption
Aggregating multiple channels bandwidth
SSID randomization
MAC address expansion
Authentication in WPA2 Enterprise is performed via:
Open access
RADIUS server
Beacon scanning
SSID cloaking
The 802.11 frame’s four MAC address fields help to:
Increase security
Route frames between wireless and wired segments
Encrypt payload
Extend frame duration
Which protocol maps IP addresses to MAC addresses in WiFi?
ARP
TCP
DHCP
RTS
Channel selection in WiFi design aims at:
Maximizing MAC address length
Reducing interference using non-overlapping channels
Encrypting data
Faster frame transmission
In LTE, what is a “handover” event?
Authentication server reboot
Device switches base stations for continued connectivity
SSID reassignment
IP address renewal
WiFi power management alternates devices between:
sleep and active states
open and secure modes
scanning intervals
beacon and probe exchanges
Massive device support in 5G is critical for:
Mobile broadband only
IoT and machine communications
Enhanced encryption
Ad hoc networks
The use of dynamic modulation in WiFi is for:
Power management
Adapting the transmission rate to channel conditions
Channel randomization
Frame length reduction
Which protocol ensures reliable data transfer at LTE’s link layer?
TCP
ARQ
UDP
DHCP
The MAC address in Address 3 of a WiFi frame allows:
Identification of authentication server
Routing via backbone’s router
Transmission over encrypted channels
Channel assignment
When using WPA3, what makes open WiFi safer?
OWE encryption of wireless traffic
SSID randomization
Channel hopping
MAC filtering
The control plane in LTE handles:
Data transmission scheduling
Authentication, location tracking, and handover
Frame encryption
SSID management
Multipath propagation in wireless causes:
Signal reflections and blur
MAC duplication
Enhanced encryption
Channel loss
Beacon frames sent by APs serve to:
Advertise available networks
Encrypt channel traffic
Trigger ARQ responses
Assign MAC addresses
Which protocol layer is most affected by mobility handover losses?
Link
Transport
Physical
Application
5G cellular focuses on which three major improvements?
Enhanced bandwidth, low latency, mass device support
Longer frame duration, SSID encryption, expanded MAC
More TCP sessions, channel re-selection, probe frame changes
Increased bit error rates, duplicate MAC addresses, randomization
Mobile IP helps devices maintain:
Encryption protocols
Session continuity with home agents and care-of-addresses
Immediate channel re-selection
Frame length matching
The purpose of probe frames in active WiFi scanning is to:
Request a list of available APs in range
Encrypt beacon traffic
Switch MAC addresses
Assign channel numbers
LTE radio frame scheduling mainly uses:
Centralized algorithms customized for operator policy
Random backoff
Collision avoidance
SSID encryption
Massive machine-type communication (mMTC) in 5G is used for:
IoT applications supporting many devices
Enhanced MAC filtering
Expanded sequence numbering
Longer duration frames
PDCP in LTE provides:
Header compression and encryption for IP datagrams
Slot reallocation
SSID changing
ARQ error correction
The main security enhancement in WPA3 is:
SAE prevents brute-force attacks
Hidden SSID fields
MAC address randomization
Channel encryption
Which device cannot function as a wireless host?
Smartphone
Laptop
Ethernet switch
IoT sensor
In a scenario where a wireless AP operates on many channels, what is the risk?
Channel overlap interference
Frame encryption
Beacon response delay
MAC address reassignment
