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

What is system prompt, Q. What is System Prompt? On loading (or Switchi...

Q. What is System Prompt? On loading (or Switching to) DOS, the screen displays C :\>, C>, A :\> or a similar message. The message displayed by DOS is called DOS Prompt or Sys

Types where relationship exists in electronic market place, What are the ty...

What are the types where relationship exists in Electronic Market Place? In this two forms of relationships can exist, they are: a. Customer/seller linkage is recognized at

Standard typewriter for information distribution, Standard typewriter : Yo...

Standard typewriter : You must have seen this manually operated machine. Standard typewriters of various makes such as Remington, Fact, Godrej, etc., are available in the market.

Differentiate between raid 0 and raid 1, Problem 1 a) Give three reaso...

Problem 1 a) Give three reasons why connecting peripherals directly to the system bus are not a good practice. b) Name five categories in which the major functions on requ

What is meant by latch, Latch is a D- type flip-flop used as a temporary st...

Latch is a D- type flip-flop used as a temporary storage device controlled by a timing signal, which can kept 0 or 1. The primary function of a Latch is data storage. It is used in

Illustration of display on video monitor, Q. Illustration of Display on Vid...

Q. Illustration of Display on Video Monitor? Displaying a single character ; display contents of BL register (Presume that it has a single character) MOV AH, 02H MOV D

How can a parent and child process communicate, How can a parent and child ...

How can a parent and child process communicate? A parent and child can communicate by any of the normal inter-process communication schemes (pipes, sockets, message queues, sha

Show the mailing lists on internet, Q. Show the Mailing lists on Internet? ...

Q. Show the Mailing lists on Internet? Another exciting aspect about E-mail is that you can find groups of people who share your interests-whether you are inclined toward games

Explain the concept of overriding, What is overriding? Overriding is an...

What is overriding? Overriding is an inherent part of association. It can show an ordered set of objects by writing {ordered} next to the appropriate association end. In 200

Registers - processor, These will be independent of each other and will not...

These will be independent of each other and will not affect to each other, and so they can be fed into two different implementations units and run in parallel. The ability to remov

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