Find Interview Questions for V3it consulting inc

1. bit stuffing
2. LRC
3. CRC
4. parity check
here 1 2 3 are either error detection or error correction
which can be potentially done by DataLink Layer
But bit stuffing (from wikipedia) seems to be done by the
physical layer so that the data arrives at the device
synchronized... (i am not sure of the working but i am sure
that it is a layer1 concept)

LRC is not done by Data Link Layer.
Reason- Bit stuffing is used in DLL to identify the new frame and the older frame which is recognized by adding 0111 at the end of every frame so that receiver will get idea that from this moment new frame will start.
Regarding CRC is used for to check whether data is altered during transmission or not and parity is also doing the same.
So remaining is LRC which is not present at DLL at all.

Hi,
As per the client requirement,they will give the columns
then we need to create the custom interface table and
custom base tables
if any queries please let me know
Thanks & Regards,
Siva

CSMA/CD is a media access control mechanism used in Ethernet
to recover from frame collision. The following steps are
followed to recover from a collision.
Step 1: Before an Ethernet device sends a frame on the
Ethernet cable, it listens to find if another device is
already transmitting a frame (Carrier Sense).
Step 2: Once the device finds that other devices are not
transmitting any frame, it starts transmitting the frame. If
two devices detect that the Ethernet cable is free at the
same time, then both will start transmitting the frames
(Multiple Access). This will result in collision.
Step 3: The Ethernet devices while transmitting the frames,
also listen for the collision. (Collision Detect).
Step 4: If they detect a collision, both the devices stop
sending the frame (back off).
Step 5: They retry the transmission after a logarithmic
time-out period. This process is repeated till the frame is
transmitted successfully, for a maximum of 16 times. The
frame is discarded after the 16th retry.

CSMA/CD -Its called the carrier Sense Multiple
Access /Collision Detection
Each interface must wait until there is no signal on the
channel, then it can begin transmitting. If some other
interface is transmitting there will be a signal on the
channel, which is called carrier. All other interfaces must
wait until carrier ceases before trying to transmit, and
this process is called Carrier Sense.
All Ethernet interfaces are equal in their ability to send
frames onto the network. No one gets a higher priority than
anyone else, This is what is meant by Multiple Access.
Since signals take a finite time to travel from one end of
an Ethernet system to the other, the first bits of a
transmitted frame do not reach all parts of the network
simultaneously. Therefore, it's possible for two interfaces
to sense that the network is idle and to start transmitting
their frames simultaneously. When this happens, the
Ethernet system has a way to sense the "collision" of
signals and to stop the transmission and resend the frames.
This is called Collision Detect.