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MAC & LLC Sublayer Quiz - Data Link Layer

1.
What is the primary function of the MAC sublayer?
Determines the physical addressing of hosts
Manages logical addressing
Routing packets across networks
Encrypting data
MAC sublayer determines physical addresses (MAC) for devices in a LAN.
2.
What does the MAC sublayer enable?
Enables devices to communicate within a local network (LAN)
Enables communication over the Internet
Manages IP routing
Manages session layer operations
MAC sublayer is responsible for communication between devices within a LAN.
3.
How do switches use the MAC sublayer?
Switches use MAC to forward frames correctly
Switches use MAC to assign IP addresses
Switches use MAC for error checking only
Switches use MAC for encryption
Switches use MAC addresses to decide which port to forward frames to.
4.
Which protocol helps map IP addresses to MAC addresses?
ARP (Address Resolution Protocol)
DHCP
ICMP
TCP
ARP maps IP addresses to MAC addresses for local network communication.
5.
How are MAC addresses typically assigned?
Typically permanent but can be spoofed
Randomly assigned by DHCP
Dynamic every time device connects
Assigned by the router
MAC addresses are burned into hardware but can be changed via software.
6.
MAC addresses are also known as?
Physical, Layer-2, hardware address
IP address
Port number
Subnet mask
MAC addresses are low-level hardware addresses at layer 2.
7.
What is the length of a MAC address?
48 bits (6 bytes)
32 bits
64 bits
128 bits
MAC addresses are 48 bits (6 bytes) long.
8.
In which format is a MAC address usually written?
Hexadecimal
Binary
Decimal
Octal
MAC addresses are usually represented in hexadecimal notation.
9.
What do the first and last 24 bits of a MAC address represent?
OUI identifies manufacturer, last 24 bits identify device
First 24 bits: IP address, last 24 bits: subnet mask
First 24 bits: port number, last 24 bits: VLAN
First 24 bits: broadcast, last 24 bits: multicast
First 24 bits (OUI) identify the manufacturer, last 24 bits are unique device ID.
10.
What are the types of MAC addresses?
Unicast, Multicast, Broadcast
IP, ARP, TCP
Hub, Switch, Router
Layer 1, Layer 2, Layer 3
MAC addresses can be unicast, multicast, or broadcast.
11.
What are the responsibilities of the LLC sublayer?
Synchronizing frames, error checking, flow control
Assigning IP addresses
Forwarding frames based on MAC
Physical signal transmission
LLC ensures correct delivery, error checking, and synchronization.
12.
Which device uses MAC addresses to forward frames within a LAN?
Switch
Hub
Router
Firewall
Switches forward frames based on MAC addresses in a LAN.
13.
MAC addresses are also known as?
Physical addressing
Logical addressing
Network addressing
Application addressing
MAC addresses provide low-level, physical addressing at layer 2.
14.
MAC addresses enable which type of communication?
LAN communication
WAN communication
Internet routing
Application layer messaging
MAC addresses are used for communication within a local area network.
15.
Can MAC addresses be changed?
Can be spoofed or changed via software
Never, permanently burned
Automatically changed by the router
Changed by DHCP
Although MACs are permanent, software can spoof them.
16.
What is the broadcast MAC address?
FF:FF:FF:FF:FF:FF
00:00:00:00:00:00
AA:BB:CC:DD:EE:FF
01:00:5E:00:00:FB
The broadcast MAC address is FF:FF:FF:FF:FF:FF.
17.
How is a MAC address represented?
48 bits long, written in hexadecimal
32 bits long, written in decimal
64 bits long, written in binary
128 bits long, written in octal
MAC addresses are 48 bits (6 bytes), represented in hexadecimal.
18.
What do the first and last 24 bits of a MAC address indicate?
OUI identifies manufacturer, last 24 bits unique device
First 24: IP address, last 24: subnet
First 24: port, last 24: VLAN
First 24: logical, last 24: physical
First 24 bits indicate the manufacturer (OUI); last 24 bits uniquely identify device.
19.
What does a unicast MAC address identify?
Unicast identifies a single device
Multiple devices
All devices in LAN
Gateway devices only
Unicast MAC addresses target one specific network device.
20.
What is the responsibility of the LLC sublayer?
LLC handles error checking and flow control
LLC assigns MAC addresses
LLC transmits bits over the medium
LLC routes IP packets
The LLC sublayer synchronizes frames, checks errors, and manages flow control.
1.
What is the length of a MAC address?
32 bits
48 bits
64 bits
128 bits
A MAC address is 48 bits (6 bytes) long.
2.
What does the first 24 bits of a MAC address represent?
Organizationally Unique Identifier
IP Address
Device Serial Number
Network Identifier
The first 24 bits identify the manufacturer (OUI).
3.
Can a MAC address be changed?
No, never
Yes, using software
Only by hardware replacement
Only on servers
MAC addresses are permanent in theory but can be spoofed using software.
4.
Which MAC address is used for broadcast communication?
00:00:00:00:00:00
01:00:5E:00:00:01
FF:FF:FF:FF:FF:FF
AA:BB:CC:DD:EE:FF
Broadcast MAC address sends frames to all devices on a LAN.
5.
What is the primary responsibility of the LLC sublayer?
Physical addressing
Error checking and flow control
Signal transmission
IP routing
LLC handles synchronization, error control, and flow control.
6.
Which sublayer is responsible for physical addressing?
MAC Sublayer
LLC Sublayer
Network Layer
Physical Layer
MAC sublayer handles physical (hardware) addressing.
7.
Which protocol maps IP addresses to MAC addresses?
ICMP
RARP
ARP
DNS
ARP resolves IP addresses into MAC addresses.
8.
Which device uses MAC addresses to forward frames?
Switch
Router
Hub
Modem
Switches forward frames based on MAC addresses.
9.
Which MAC address type identifies a group of devices?
Unicast
Multicast
Broadcast
Anycast
Multicast MAC addresses target a specific group of devices.
10.
What does the Data Link Layer frame ensure?
End-to-end validity of data
Signal strength
IP addressing
Encryption
Data Link Layer frames ensure error-free delivery within the LAN.

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