Cisco Networking Assessment Essay Example | Topics and Well Written Essays - 1500 words

Cisco Networking Assessment - Essay ExampleError correction excessively includes the additional ability to reconstruct the original message, with error-free data.Two basic methods have been designed to handle the error correcting system. These are called the Automatic repeat-request (ARQ), and the Forward Error correction (FEC). The ARQ sends that data with an error detection code, which the receiver user to check for errors. In the FEC method the transmitter includes an error-correcting code (ECC) and sends the coded message. The receiver never sends any data to the transmitter, it practiced decodes what it thinks is the most likely data.The Network Layer deals with errors via a variety of direction (Wikipedea, 2008). These are to ensure the QOS is maintained. These can be items such as the Parity check, which means that if any bits are corrupted in the message, they are replaced to the expected format. A checksum, which involves an algorithm to check the validity of the data, Ha sh licks, which perform a similar power and repetition schemes. The full list of methods is stated hereThe Transport Layer uses 2 two expressive style error correction protocol, which involves a discussion among the sender and the receiver. This is where the receiver informs the transmitter to resend a message when an error occurs. ... Repetition schemes Parity schemes Checksum Cyclic redundancy checks Hamming distance based checks Hash function Cryptographic message digest Horizontal and vertical redundancy check Polarity schemesTransport LayerThe Transport Layer uses 2 two way error correction protocol, which involves a discussion between the sender and the receiver. This is where the receiver informs the transmitter to resend a message when an error occurs. The two basic types for each piece of ground transferred are called a NACK (Not Acknowledged), when a failure occurs and an ACK (Acknowledged) when a packet has been successfully received. The way it does this is to check the header/footers of packets to see if it is in the format expected. This is usually achieved by CRC (Cyclic Redundancy Check) checksums which are calculated based on the data transmitted.SummaryBasically, the Network Layer function is to check the validity of the data at a lower level than the Transport Layer, and communicates the problem up the hierarchy. The Transport Layer in turn, informs the transmitter to resend the erroneous data. The Transport layer has other functions, such as allowing a mechanism where the receiver informs the transmitter what to send next and what is expected.Question 2 (5 marks)What are the different types of collisions that can occur on an Ethernet network shortly explain each.There are the types of collision where two packets are sent over the network at the same time, and this is handled by the CSMA/CD (Carrier Sense septuple Access / Collision Detect) protocol and a Collision Domain. A Collision Domain happens when two devices on the network tran smit at the same time (The transmission control protocol/IP Guide, 2005). An Ethernet network can be composed of a single or a multiple