Internet routing hierarchy, Computer Networking

Assignment Help:

So how packets do determines their way across the Internet? Does each computer linked to the Internet know where the other computers are? Do packets just get 'broadcast' to every computer on the Internet? The answer to both the preceeding questions is 'no'. No computer knows where any of the other computers are, & packets do not get sent to each computer. The information utilized to get packets to their destinations is contained in routing tables kept through each router linked to the Internet.

Routers are packet switches. Usually a router is linked between networks to route packets between them. Each of the router knows it's sub-networks and which IP addresses they employ. Usually the router doesn't know what IP addresses are 'above' it. Study the figure below. The black boxes linking the backbones are routers.

At the top the larger NSP backbones are linked at a NAP. Under them are many sub-networks, and under them, more sub-networks. At the bottom are two local area networks along computers attached.

1146_Internet Routing Hierarchy.png

Figure:  Routes Connecting in Network

While a packet arrives at a router, the router verifies the IP address put there through the IP protocol layer on the originating computer. The router verify it's routing table. If the network having the IP address is found, the packet is sent to that network. If network having the IP address is not found, then on a default route the router sends the packet, usually up the backbone hierarchy to the next router. Optimistically the next router will know where to send the packet. If this does not, again the packet is routed upwards till it reaches a NSP backbone. The routers linked to the NSP backbones hold the largest routing tables & here the packet will be routed to the right backbone, where it will starts its journey 'downward' through smaller and smaller networks till it finds it's destination.


Related Discussions:- Internet routing hierarchy

Give the types of firewalls, Give the types of firewalls Conceptually,...

Give the types of firewalls Conceptually, there are two types of firewalls: 1.  Network Level 2.  Application Level Network Level Firewall/Packet Filters The Net

Explain full duplex data transmission, Q. Explain Full Duplex data transmis...

Q. Explain Full Duplex data transmission? - Have two separate Communication channels as well as use each one for simplex Data traffic (in different directions). - If this is

Mesh, Mesh It is of two dimensional network.  In this every processi...

Mesh It is of two dimensional network.  In this every processing elements are arranged in a two dimensional grid. The processor are in rows i and column j are denoted by PEi

Ack received - trasnport layer, ACK Received If an ACK is received by ...

ACK Received If an ACK is received by the  sender. The  SR sender marks  that packet  as having  been received by the receiver.

Explain stop--and--wait automatic repeat request, Q. Explain Stop--and--Wai...

Q. Explain Stop--and--Wait automatic repeat request? 1. Numbering frames prevents the retaining off duplicate frames. 2. Numbered acknowledgement are needed in case of delay

Name the layers of osi, List the layers of OSI There are seven layers i...

List the layers of OSI There are seven layers in OSI model a. Physical Layer b. Data Link Layer c. Network Layer d. Transport Layer e. Session Layer f. Presen

What are different ways of securing a computer network, What are different ...

What are different ways of securing a computer network? There are lots of ways to do this. Install reliable and updated anti-virus program on all computers. Make sure firewalls

Explain 10base2 - thinnet, 10Base2 - Thinnet Cable diameter is abou...

10Base2 - Thinnet Cable diameter is about 0.64 cm (RG-58) More flexible as well as easier to handle and install than Thicknet "2" represents a maximum segment len

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