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What is CRC and which layer it use?
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Answer / chandru
A CRC(Cyclic Redundancy Check)is an error-detecting
code.Happens at Data link layer.
| Is This Answer Correct ? | 19 Yes | 0 No |
Answer / jitendera
Crc calculation method
______________*_____________________
This is the topic consern with BE btech studendt
let take a simple example.
Let's do a simple example, dividing a message 100110 by the
key 101.
100110 = x^5 + x^2 + x (why i have writen this.count from
left threr is 6 numrix value so it sholud start frrom x5
and last is x^0
simalry 101 is x2 + 1.(it is key value with degree 2 max
degree)
Since the degree of the key is 2, we start by appending two
zeros to our message.
10011000 / 101
101
111
101
100
101
100
101
01
We don't even bother calculating the quotient, all we need
is the remainder (the CRC), which is 01 in this case. The
original message with the CRC attached reads 10011001. You
can easily convince itself that it is divisible by the key,
101, with no remainder.
In practice we don't write the top bit of the key--it is
implicit. In this particular example, we would only store
bits 01 as our key.
| Is This Answer Correct ? | 7 Yes | 3 No |
Answer / ravi
hi jitendera
i am ravi here and i am an engineering student from delhi i
have lots of interest in computer network.i was in serch of
the crc calculation method.i went through tennon bom and
frozen but not able to get understand then i came to google
and on serching i found your reply on that site and now
after reading yours answer and i find no any difficulty to
understand it now i can solve more complex polynomilas
based upon yours consept.many many thanks to you.
if you donot mind may i post some basic coputer network
question of our sylebus in which i am facing difficulty?.
thanks aagin
| Is This Answer Correct ? | 1 Yes | 3 No |
I received a call from client that network is down. We have 100 or 1000 of switches and routers so how could we find the client switch and its port number? and useful commands to find this ?
R1#sh ip nat translations Pro Inside global Inside local Outside local Outside global icmp 15.1.1.1:11 10.1.1.1:11 30.1.1.1:11 30.1.1.1:11 icmp 15.1.1.1:12 10.1.1.1:12 20.1.1.1:12 20.1.1.1:12 icmp 15.1.1.1:13 10.1.1.1:13 21.1.1.1:13 21.1.1.1:13 icmp 15.1.1.1:14 10.1.1.1:14 31.1.1.1:14 31.1.1.1:14 R1# So my question is that after every ip address [:] is used & some number. 15.1.1.1{:11}... what is this colon & number indicate. Can anyone tel me this..!!! Thanking you advance. Shahin
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