How does a routing table work?

Hello Friends, In this blog post(How does a routing table work) I am going to let you know about routing and routing tables. You will see how the data packets travel from source to destination.

In this blog post(How does a routing table work), we are going to explore What is a routing table used for. How does a routing table work? What are routing types of routing? What is an IP routing table with an example?

What is a routing table used for?|How does a routing table work?

A routing table is a database collection of all the routing paths that decide the direction and path of a data packet over a network.| How does a routing table work|

A routing table is a data file in the RAM that stores all the route information about directly connected as well as remote networks |How does a routing table work|

How does a routing table work?

As we know each data packet consists of information about its origin and its destination.

And routing table decides the best path for a packet to travel from origin to destination and thus forward it accordingly.

As per the routing table route for a packet, it is sent to the next nearest and most effective routing hop.

What are routing types of routing?

Routing is a process to forward the data packet to its destination with an effective and optimal route.

This process is done by the Network layer in the network. In the case of static routing, we have to manually fill the routes of a data packet in the routing table.

What is an IP routing table with an example?

When a router receives an IP packet then it looks in the routing table and selects the best optimal or fastest path to deliver this IP packet to the destination. RIP, IGRP, EIGRP, and OSPF are examples of IP routing.

What is static and dynamic routing?

In static routing, a user defines the routes or paths manually and updates them from time to time.

In dynamic routing, the routes and paths are changed and updated as per the network change automatically.

Static routing, may not follow any specific protocol, but dynamic routing follows various protocols like BGP, RIP, EIGRP, etc.


Almost everyone is familiar with the general concept of routing. It means that if anyone wants to go from point A to point B, they have to decide on a path to go there.

In the same way, if anybody wants to transfer information between computers situated at two different locations that are connected via a WAN, network protocols must decide how to get it there.

In the case of LANs, organized around a single bus or ring, routing is not a problem.

If their connection is with the bridges, the bridges make the routing decision.

Topologies are not very complex and bridges perform the routing rather easily.

Routing Tables:

Routing tables may be used by the network nodes similar to the bridges.

Here, routing tables do not normally specify the whole route.

In place of this, they specify the next node in a route to a specified destination and the cost to go there.

For example, the network in fig1 is considered, where a cost is associated with the connection between two adjacent nodes.

Assume that, the cheapest route is to be found which minimizes the sum of the costs of the connection between adjacent nodes. in the route.

As an example, there are many routes from A to F, but the cheapest one goes from A to B (cost of 2) B to E (cost of 3), and E to F(cost of 2) for a total route cost of 7.

Partial route tables of nodes A, B, and E are shown in Fig 2.

Node A’s tables show that anything destined for node B, E, or F should be sent directly to B, Where B’s routing table will show the next node in the cheapest route.

In the same way, anything destined for C or D should be sent to node C. From there, the next step is indicated in C’s routing table.

For example, suppose an application at node A wants to send data to node F.

Logic at A seems for an entry in its routing table with destination F.

From the entry, it can be seen that node B is the successor on the route and the network protocol sends the data to B.

Corresponding to destination F, logic at B examines its routing table looking for an entry. According to the table’s third entry, the data should go to node E next. At last, the routing table at node E tells us that F is the next node on the route.

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