What is internet routing hierarchy, Computer Engineering

Assignment Help:

Q. What is Internet Routing Hierarchy?

So how do packets find their way across Internet? Does every computer connected to Internet know where other computers are? Do packets basically get 'broadcast' to each computer on the Internet? Answer to both the preceding questions is 'no'. No computer knows where any of the other computers are and packets don't get sent to each computer. Information used to get packets to their destinations is contained in routing tables kept by every router connected to Internet.

Routers are packet switches. A router is typically connected between networks to route packets between them. Each router knows about its sub-networks and which IP addresses they use. Router usually doesn't know what IP addresses are 'above' it. Examine the figure below. Black boxes connecting backbones are routers. Larger NSP backbones at the top are connected at a NAP. Under them are various sub-networks and under them, more sub-networks. At bottom are two local area networks with computers attached.

170_What is Internet Routing Hierarchy.png

Figure: Routes Connecting in Network

When a packet arrives at a router, router examines IP address put there by IP protocol layer on originating computer. Router checks its routing table. If network containing IP address is found, packet is sent to that network. If network comprising IP address isn't found, then router sends the packet on a default route, usually up backbone hierarchy to the next router. Confidently subsequent router will know where to send packet. If it doesn't, again packet is routed upwards till it reaches a NSP backbone. Routers connected to NSP backbones hold the largest routing tables and here packet would be routed to correct backbone, where it will begin its journey 'downward' through smaller and smaller networks till it finds its destination.


Related Discussions:- What is internet routing hierarchy

Explain program interpretation process, Explain program interpretation pr...

Explain program interpretation process. In a program interpretation process , the interpreter reads the source program and stores this in its memory. This bridges an executi

Difference between the functions unlink and unset?, Unlink() is a function ...

Unlink() is a function for file system handling. It will easily delete the file in context.   Unset() is a function for variable management. It will create a variable undefin

Test, what persistance shouold i use

what persistance shouold i use

Which approaches not require knowledge of the system state, Which approache...

Which approaches do not require knowledge of the system state? Ans. Deadlock detection, deadlock prevention and deadlock avoidance; none of the given require knowledge of the s

Give brief summary of common aspects found in spreadsheets, Give brief summ...

Give brief summary of common aspects found in spreadsheets -  It's made up of columns and rows; every row is identified by a number and every column is identified with a letter

Object orientation and uml, In this task you are supposed to create three U...

In this task you are supposed to create three UML diagrams. The conditions are given by the scenario in the document Theatre Case (on Blackboard). A theatre manager has ordered a s

What is thread, What is Thread? A thread, sometimes termed a lightweigh...

What is Thread? A thread, sometimes termed a lightweight process (LWP), is a fundamental unit of CPU utilization; this comprises a thread ID, a register set, a program counter

What are the characteristics of semiconductor ram memories, What are the ch...

What are the characteristics of semiconductor RAM memories? They are available in a wide range of speeds. Their cycle time range from 100ns to less than 10ns. The

Define memory access time, Define memory access time? The time needed t...

Define memory access time? The time needed to access one word is known as the memory access time. Or It is the time that elapses among the initiation of an operation and the co

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