Network Layer and Routing , Computer Networking

Assignment Help:

Network Layer and Routing

As discussed in previous  chapters the physical  layer  provides   connection sand services to the  data link  layer while the  data link layer is  connected with the  construction of frames error control  flow  control and the transmission of frames over the physical  circuit connection between  computers or even  between  different types  of networks. The  frames  may have  to go through a number of nodes  ( computer networks ) which  may be connected in different topologies. The  network layer entity uses the services of the data link layer and provides services( routing  of packets relaying congestion control etc) to  its higher layer ( transport) and also to different types of intermediate networks of sub networks. The  primary  function of the  network layer are routing selection of appropriate faults controlling of overloading or congestion of traffic on communication lines. Efficient use of various communication liens, etc. This  layer  manages network layer connections and  provides an end to end reliable packet  delivery mechanism. This  provides user to user connection for  exchange of data between them.

The network  layer in the  OSI model is also known  as the subnet which may  run on  internet  where the network  layer  runs on  interface message  processors. The  transport  layer of  the OSI  model  runs on  the horsts. The control  and management of the network layer are provided by  different  organization in different  countries such as  PTT. At and t etc PTT is very poplar  in European countries and undeveloped countries . thus the network layer  not only  provides  services to the transport layer an different sub networks but also defines an interface and  connection different  hosts and different type of networks.

 shows a simple network  with two  hosts. H1  and H2. And several routers on the  path  between H1 and H2. Suppose that H1. Is  sending  information  to H2.and consider the role  of the  network layer  in these  hosts  and in the intervening grouters. The  network layer in H1 takes segments  from the  transport layer inH1. Encapsulated each  segment  into a datagram ( that  is a network layer packet) and  then starts the datagram's  on their  journey to their  destination that is it sends the datagram's to its  nearby router R1. At the receiving  host H2. The network  receiver  the datagram's from  its nearly  router R2 extracts the transport  layer  segments and delivers the segments up to the transport  layer atH2 the primary  role  of the  routers  is to forward datagram's from input links to  output  links. Note  that the  routers in figure are show  with  a truncated protocols  stack that is  with no  upper layers above the  network  because router  do not run  application  and transport layer  protocols.


Related Discussions:- Network Layer and Routing

What are the value added services, What are the value added services Ma...

What are the value added services Many organisations are demanding higher services (also called value added services) such as faxing, minimal cost call routing, connectivity to

Packet switching - fundamentals of networks, Packet Switching In the  ...

Packet Switching In the  packet  switching network  type on specific  path is  used for  data  transfer. Instead the data is chopped up into  small  pieces called packed and s

What are the error correction techniques, Q. What are the Error Correction ...

Q. What are the Error Correction Techniques ? Error Correction Error Correction Techniques Retransmission Forward Error Correction Burst Error Corre

Process management in pvm, Process Management int pvm_mytid( void ...

Process Management int pvm_mytid( void ) Returns the tid of the calling process.  tid values less than zero indicate an fault. int pvm_exit( void ) T

Optimizing stp, Optimizing STP  Because there is a separate instance of ...

Optimizing STP  Because there is a separate instance of the spanning tree for every active VLAN, a separate root election is conducted for each instance. If the default switch p

Error correcting code - hamming code, Error Correcting Code - Hamming Code:...

Error Correcting Code - Hamming Code: Hamming code is the one of the error-correcting code named after its inventor. Because of the simplicity of the hamming code, it can dete

Cdma gsm back haul network, S t d "B" 6.4 m Ku-BAND EARTH STATION (2004) ...

S t d "B" 6.4 m Ku-BAND EARTH STATION (2004)   D-Sat (District Satellite Project) circuits for rural connectivity via satellite are in operation. Purpose of this project i

Retransmission of packets - transport layer, Retransmission of packets ...

Retransmission of packets The disadvantage  of thronging away a correctly received packet is that  the subsequent retransmission  of the  packet might  be lost  or garbled and

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd