how to write a protocol please answer soon very immediately please please
Answers
Explanation:
As mentioned in the Internet Section the Internet is an abstraction from the underlying network technologies and physical address resolution. This section introduces the basic components of the Internet protocol stack and relates the stack to the ISO OSI reference protocol stack model. The model of the Internet protocol stack is illustrated in the figure below.
This documents describes the various parts presented in this diagram. The upper layer protocols, e.g., FTP, Telnet, TFTP etc. are described in the Presentation Layer Protocol section. This leaves the following topics as sections in this document:
Internet Protocol (IP)
User Datagram Protocol (UDP)
Transmission Control Protocol (TCP)
Transactional Transmission Control Protocol (T/TCP)
TCP/IP and OSI/RM
Internet Protocol (IP)
As seen in the figure above, the Internet protocol stack provides a connection oriented reliable branch (TCP) and an connectionless unreliable branch (UDP) both build on top of the Internet Protocol.
The Internet Protocol layer in the TCP/IP protocol stack is the first layer that introduces the virtual network abstraction that is the basic principle of the Internet model. All physical implementation details (ideally even though this is not quite true) are hidden below the IP layer. The IP layer provides an unreliable, connectionless delivery system. The reason why it is unreliable stem from the fact the protocol does not provide any functionality for error recovering for datagrams that are either duplicated, lost or arrive to the remote host in another order than they are send. If no such errors occur in the physical layer, the IP protocol guarantees that the transmission is terminated successfully.
The basic unit of data exchange in the IP layer is the Internet Datagram. The format of an IP datagram and a short description of the most important fields are included below:
LEN
The number of 32 bit-segments in the IP header. Without any OPTIONS, this value is 5
TYPE OF SERVICE
Each IP datagram can be given a precedence value ranging from 0-7 showing the importance of the datagram. This is to allow out-of-band data to be routed faster than normal data. This is very important as Internet Control Message Protocol (ICMP) messages travels as the data part of an IP datagram. Even though an ICMP message is encapsulated in a IP datagram, the ICMP protocol is normally thought of as a integral part of the IP layer and not the UDP or TCP layer. Furthermore, the TYPE OF SERVICE field allows a classification of the datagram in order to specify is the service desired requires short delay time, high reliability or high throughput. However, in order for this to have any effect, the gateways must know more than one route to the remote host and as described in the Introduction, this is not the case.
IDENT, FLAGS, and FRAGMENT OFFSET
These fields are used to describe fragmentation of a datagram. The actual length of an IP datagram is in principle independent of the length of the physical frames being transferred on the network, referred to as the network's Maximum Transfer Unit (MTU). If a datagram is longer than the MTU then it is divided in to a set of fragments having almost the same header as the original datagram but only the amount of data that fits into a physical frame. The IDENT flag is used to identify segments belonging to the same datagram, and the FRAGMENT OFFSET is the relative position of the fragment within the original datagram. Once a datagram is fragmented it stays like that until it receives the final destination. If one or more segments are lost or erroneous the whole datagram is discarded.
Explanation:
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