Answer / roop&

Cyclic Redundancy Check and Data LINK Layer

Answer / chandru

A CRC(Cyclic Redundancy Check)is an error-detecting
code.Happens at Data link layer.

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.

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

Hi Anyone can share the latest ICND1 (640-822)dumps updated at 30 september 2009. specialy to Jatendra if you have any updated about the ICND1 exam.will be remain thankful.

2 Answers  

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What is the bit length and expression form of a MAC address? A. 24 bits expressed as a decimal number B. 24 bits expressed as a hexadecimal number C. 36 bits expressed as a binary number D. 48 bits expressed as a decimal number E. 48 bits expressed as a hexadecimal number

2 Answers  

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Which term describes the process in which frames from one network system are placed inside the frames of another network system? A. bridging B. tunnelling C. data link control D. generic routing E. packet switching

1 Answers  

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How many types of ospf configuration?

0 Answers  

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Which reserve port number talent use?

0 Answers  

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Which IP Address Class can have 64,000 subnets with 64,000 hosts per subnet? A. Class B B. Class A C. Class C D. Class D

2 Answers  

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let there are three switch and there are 3 ree valn craed on each switch that is vlan 2 on first switch valn 3 on 2nd switch and vlan 4 is cretaed on switch 3 i have implemnted intervlan routin through ciso switchses. the router is conected through its fa0/1 port by one switch and and the two switch are trunked with each other now question is that we want to comuniacte betwwen vlan but does alse want that only vlan 2 is allow to access internet (ISP)which is conected through s0 interface of router.and no any vlan can access that internet.what should be solution.

1 Answers  

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LAN stands for which of the following? A.) Local Area Network B.) Local Arena Network C.) Local Area News D.) Logical Area Network

3 Answers  

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while trouble shooting a network conectivty prob a technician observes that steady link light on the both work stations nic and the switch port which the workstation is conected.however when the ping comand is issuede from the work station the out message is request time out at which layer of osi model does the prob most likly exist 1 sessiom layer protocol layer datalink kayer acess layer network layer application layer i have ansered n/w layer but i am niot sure i have also posted privous question jitendera kumar sinha

3 Answers  

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What is Cisco's default encapsulation method on serial interfaces? A.) ANSI B.) Cisco C.) Q933a D.) HDLC

1 Answers  

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Identify the administrative distance and appropriate routing protocol? A.) RIP = 255, IGRP = 100 B.) RIP = 100, IGRP = 120 C.) RIP = 1, IGRP = 0 D.) RIP = 120, IGRP = 100

4 Answers  

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Suppose a USER is saying he is not able to access the internet or page loading is slow what trobleshooting steps you will take to get it fixed

5 Answers   Infosys,

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