What is CRC and which layer it use?
- 4 Answers
- 25763 Views
- CMS, I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
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 |
What is protocol data unit in ccna?
What is LSA? How many types of LSA used by OSPF version 2??
Identify the command to configure the configuration-register? A.) Router# config-register 0x2102 B.) Router(config)# config-register 0x2102 C.) Router(config-reg)# 0x2102 D.) Router> config-register 0x2102
What command displays the OSPF section of the running-configuration?
What does the command “IP name-server 255.255.255.255″ accomplish? a.It disables domain name lookup. b.It sets the domain name lookup to be a local broadcast. c.This is an illegal command. d.The command is now defunct and has been replaced by “IP server-name ip any”
Which is not a common problem with Distance-Vector routing? A.) Slow convergence. B.) Complex configuration. C.) Routing loops. D.) Periodic updates can slow convergence. E.) Counting to infinity.
What is link aggregration?? How many types of protocol are used on that???
Your Ethernet interface currently has the IP address of 1.1.1.1/24. You would like it to have a second IP address of 2.2.2.2/24. Which command will do that? A.) ip address 1.1.1.1 2.2.2.2 255.255.255.0 B.) ip address 2.2.2.2 255.255.255.0 secondary C.) ip address 2.2.2.2 255.255.255.0 D.) This cannot be done, you can only have 1 IP address per physical interface. E.) ip address 2.2.2.2 /24
What is the purpose of the DLCI? A.) Identifies the remote routers B.) Contained with a 802.2 frame for routing purposes C.) Used with PPP during authentication D.) Identifies the PVC in a Frame Relay network
Which statement is true regarding full duplex? A.) Allows for transmission and receiving of data simultaneously B.) Only works in a multipoint configuration C.) Does not affect the bandwidth D.) Allows for transmission and receiving of data but not a the same time
Which mode we can't skip when we come back from interface mode?
Can you explain the basic of encryption in VPN?
CCNA 
