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

Achieving universal services, The purpose of internetworking is universal s...

The purpose of internetworking is universal service across heterogeneous networks. To give this service all computers, and routers have to agree to forward information from a sourc

Hypercube network and properties, Hypercube Network The hypercube archi...

Hypercube Network The hypercube architecture has played a vital role in the development of parallel processing and is still not much popular and influential. The highly symmetr

Router share information in distance vector routing, Explain how does route...

Explain how does router share information in Distance Vector routing?

Encoding data options in parallel virtual machine , Encoding data options ...

Encoding data options PVM uses SUN's XDR library to generate a machine independent data format if you request it. Settings for the encoding option are: PvmDataDefault: Use X

Issues with bridges connecting different lans, Issues with Bridges Connecti...

Issues with Bridges Connecting Different LANs - Frame format - differences in frame structure, fields used (example Ethernet to Token Ring) - Payload size - size of data en

What is difference between arp and rarp, What is difference between ARP and...

What is difference between ARP and RARP? The address resolution protocol (ARP) is used to associate the 32 bit IP address with the 48 bit physical address, used by a host or a

Discuss about the latest internet and intranet technologies, Latest Interne...

Latest Internet and Intranet technologies Even though the security capabilities of the latest Internet and Intranet technologies have enabled the companies to control the avail

What are the station types of bss, Station Types No-transition mobility...

Station Types No-transition mobility moreover stationary or moving only inside a BSS BSS-transition mobility is able to move from one BSS to another, but confined inside one

Two metrics used to make routing decisions, In Novell's use of RIP, there a...

In Novell's use of RIP, there are two metrics used to make routing decisions.  What are they? Ans) A. Ticks. B. Hops

Classify different types of ip routing, INTERNETWORKING - TCP/IP 1. Sta...

INTERNETWORKING - TCP/IP 1. State the following terminologies: a) Node b) Router c) Host d) Subnet e) Network 2. What do you understand by IEEE 802 Local Area network 3.

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