OSI layer 2 Functions

aljugan

Hi. i have a question about (Q & A in Cisco official certificate guide Chapter 3).....The question is ......


Which of the following is one of the functions of OSI Layer 2 protocols?
a. Framing
b. Delivery of bits from one device to another
c. Error recovery
d. Defining the size and shape of Ethernet cards

and answer is
a.Framing

i want to ask that b is correct as well because from data link layer data is transferred to physical layer am i right or not?????

darkerz

Layer 1, bits, 1's and 0's
Layer 2, frames, switching
Layer 3, packets, routing
Layer 4, segments, transport

...

Etc.

Answer the question?

networker050184

Bits are transferred at layer 1.

Bellman80

Any time you hear the word 'frame' think Layer 2.

At first glance, I thought b. would be closer to physical layer, but on second thought, it could mean anything. The whole Internet is 'delivery of bits from one device to another' after all.

Framing is definitely a better answer here, just remember Layer 2 = framing.

aljugan

thanks all of you specially bellman80 .......

bbarrick

Bellman80 wrote: »

Any time you hear the word 'frame' think Layer 2.

At first glance, I thought b. would be closer to physical layer, but on second thought, it could mean anything. The whole Internet is 'delivery of bits from one device to another' after all.

Framing is definitely a better answer here, just remember Layer 2 = framing.

In the ICND1 book they stress the fact that Layer 1 is for delivery of bits from one end to the other. The rest of the layers determine the specifics as to how those bits are to be transferred.

Just in case the OP see's a questions specifically about layer 1.

xnx

When they mention 'bit delivery' you should be thinking of how the signal gets to the other point electronically, so this happens at Layer 1

TechGuru80

darkerz wrote: »

Layer 1, bits, 1's and 0's (anything physical...NICs, cables, equipment)
Layer 2, frames, switching
Layer 3, packets, routing
Layer 4, segments, transport

Memorize this because this explains four important levels.

tasman35

TechGuru80 wrote: »

Memorize this because this explains four important levels.

Good stuff

bwillford

Just throwing out my mnemonic for remembering that: Damn, Some People Fight Back

Layer 5-7 - Data
Layer 4 - Segment
Layer 3 - Packet
Layer 2 - Frame
Layer 1 - Bits

mella060

All
People
Seem
To
Need
Data
Processing

tecollins

bwillford wrote: »

Just throwing out my mnemonic for remembering that: Damn, Some People Fight Back

Layer 5-7 - Data
Layer 4 - Segment
Layer 3 - Packet
Layer 2 - Frame
Layer 1 - Bits

That's awesome I'm totally stealing that.

ScrawnyRonnie

mella060 wrote: »

All
People
Seem
To
Need
Data
Processing

Away
Pizza
Sausage
Throw
Not
Do
Please

My instructor used this and it stuck for some reason It doesn't help with the understanding of what each layer does, but pizza is good.