Networking protocols, Operating System

Modern networks are not implemented as a single piece of software; that would render the task of dealing with multiple technologies and manufacturers virtually impossible. The solution for this problem is to structure computer networks as stacks of different protocols. A protocol can be seen as a "language" in which two entities (computers, routers, etc) communicate with each other. Typically, one protocol is created to solve a predetermined set of networking tasks, such as being able to send ?xed-length messages, or guaranteeing message order, etc. The capability of a protocol to solve these tasks makes it a "black box" that can be used by protocols on the level immediately above; similarly, the protocol itself can make use of the capabilities provided by the protocol on the level immediately below. Thus, all modern networks are implemented as a stack of abstractions, all of which are implemented as composable protocols; we say that the layer N provides services to layer N+1 and uses the services from layer N-1.

As an example, consider the stack presented in Figure in this example we show how the HTTP protocol (or, similarly, SMTP and ssh) can be implemented using the services provided by the TCP protocol. Also, the TCP protocol is implemented using the services of the IP layer, which itself uses the services provided by the Ethernet layer. Notice that one advantage of this type of architecture is that if we were to build a new functionality (say, wireless connections, instead of Ethernet), it would suf?ce for us to implement this new layer and to guarantee that it provides, to the IP level, the same services that were once provided by the Ethernet level. Nowhere would we need to care about the details of TCP, HTTP, or, for that matter, any of the top-level protocols.

Posted Date: 3/13/2013 3:09:57 AM | Location : United States







Related Discussions:- Networking protocols, Assignment Help, Ask Question on Networking protocols, Get Answer, Expert's Help, Networking protocols Discussions

Write discussion on Networking protocols
Your posts are moderated
Related Questions

Q. More than one disk drive is able to be attached to a SCSI bus. Especially a fast wide SCSI-II bus can be connected to at most 15 disk drives. Remember that this bus has a bandw

Now let's implement bounded producer-consumer with semaphores, a Coke machine which is initially empty: semaphore sem_mutex = 1 // binary semaphore for mutual exclusion, 1==unlo

Signal handling A signal is used in UNIX systems to inform a process that a particular event has occurred. 1. A signal is produced by the occurrence of a particular event.

Write a short note on disk structure Modern disk drives are initiate as large one dimensional array of logical blocks where the logical block is the smallest unit of transfer.

What is page fault? In the computer storage technology a page fault is an exception which is raised by the memory management unit when a requested page isn't mapped in physical

time-stamping It is a method proposed by Lamport, used to sequencing events in a distributed machine without the use of clocks. This process is intended to order events consis

Deadlock Avoidance It's a method to evade deadlock by careful resource scheduling. This approach to the deadlock problem foresees deadlock before it actually occurs. This a

Question 1 Brief the following distributed computing system model Question 2 Explain the components involved in implementation of RPC mechanism Question 3 What is

Basic File System Uses the specific device driver. Deals with blocks of data that are exchanged with the physical device. Concerned with the placement of blocks on