Layer 2 of the osi model

What happens in the data link layer?

Bits are packaged into whats called “frames” and those frames are sent across the network

what does MAC stand for?

Media Access Control

How are MAC address identified?

When it comes to MAC addresses,
each company that makes network cards
gives a unique 48-bit address
to every network interface card they create

Mac Address

a way to physically identify a device on a network,
and it helps the device communicate and work properly within the network’s layout (called a logical topology)

How are MAC addresses written?

hexadecimally

How many bits are each letter or number of a MAC address

4 bits

What part of a MAC address identifies the manufacturer of the device?

The first 6 characters (or first 3 pairs)

What does the second half of a mac address show?

Represents the exact machine it belongs to

Flow Control

we make sure each device knows when it’s their turn to talk, so they don’t interrupt each other

What does LLC Stand for?

Logical Link Control

What is Logical Link Control?

helps make sure the receiver gets the message and confirms it’s arrived at the right place.

Logical Link Control

Allows a device to make a request for less information or to replay that information

What is the error control function of LLC?

Allows the receiver to inform the sender if the frames was either not received or corrupted

how is communication synchronized across layer 2?

isochronous mode, synchronous method, and asynchronous transmission methods.

What is Isochronous mode

uses a reference, like a clock, to synchronize devices, and it can also create specific time slots for each device to send its data.

What is the Synchronous method?

Similar to isochronous, involving devices using the same clock. This method going to have beginning and ending frames

what is asynchronous within layer 2

Each device uses its own reference to time and its own start and stop bits.

Switches, bridges, and MAC Addresses are examples of which layer?

Layer 2