A default route is the route that takes effect when noother route is available for an IP destination address.
If a packet is received on a routing device, the device firstchecks to see if the IP destination address is on one of the device’slocal subnets. If the destination address is not local, the devicechecks its routing table. If the remote destination subnet is notlisted in the routing table, the packet is forwarded to the next hoptoward the destination using the default route. The default routegenerally has a next-hop address of another routing device, whichperforms the same process. The process repeats until a packet is deliveredto the destination.
The route evaluation process in each router uses the longestprefix match method to obtain the most specific route. The networkwith the longest subnet mask that matches the destination IP addressis the next-hop network gateway.
The default route in IPv4 is designated as 0.0.0.0/0 or simply0/0. Similarly, in IPv6, the default route is specified as ::/0. Thesubnet mask /0 specifies all networks, and is the shortest match possible.A route lookup that does not match any other route uses this routeif it is configured and active in the routing table. To be active,the configured next-hop address must be reachable.
Administrators generally point the default route toward therouting device that has a connection to a network service provider.Therefore, packets with destinations outside the organization's localarea network, typically destinations on the Internet or a wide areanetwork, are forwarded to the routing device with the connection tothat provider. The device to which the default route points is oftencalled the default gateway.
FAQs
A default route, also known as the gateway of last resort, is the route used by the router when the IP destination address from a certain packet is unknown. For IPv4, the default route is 0.0. 0.0/0.
How do you identify the default route? ›
In the Command Prompt window, type “ipconfig” and press “Enter/Return” on your keyboard. You will see a lot of information generated in this window. If you scroll up you should see “Default Gateway” with the device's IP address listed to the right of it.
What is the purpose of the default route group of answer choices? ›
What is the purpose of the default route? It serves as a guideline for how to configure routes. It's a route set by Microsoft so that all information comes to their servers first. It's where the router sends all packets with destinations of which it has no knowledge.
What routes does a router know by default? ›
The default route in IPv4 is designated as 0.0. 0.0/0 or simply 0/0. Similarly, in IPv6, the default route is specified as ::/0. The subnet mask /0 specifies all networks, and is the shortest match possible.
What are the three segments of the default route? ›
The Default route maps the first segment of a URL to a controller name, the second segment of a URL to a controller action, and the third segment to a parameter named id.
What are the disadvantages of default route? ›
The following are the disadvantages of Default routing: Has no fault tolerance (if the link to Default Gateway fails, it is not auto routed to available ports) It is impractical on large networks.
What is the difference between default route and full route? ›
A default route is the route that will be used if there's no other route that matches the destination in the router's forwarding table. A full routing table is a table which contain all the routes the BGP neighbor is aware of.
What is the default gateway for a 192.168 network? ›
The default gateway is 192.168. 0.1. Except for the packet for the local machine or for the subnet 192.168. 0.0/24, all packets sent by this PC for other networks will be routed through the gateway machine with 192.168.
What does 0.0 0.0 0 mean in a routing table? ›
In IPv4-based routing, 0.0. 0.0 serves as a default route. This means no particular address has been designated in the routing table as the next hop in the packet's path to its final destination.
Why is default routing important? ›
Why is it important to configure a default route on a router? - Quora. A default route is necessary at a minimum so the router knows where to route traffic to. With no routes, no traffic gets through the router. It's not usually necessary to actually configure it as it's always part of the default configuration.
The default gateway is the path used to pass information when the device doesn't know where the destination is. More directly, a default gateway is a router that connects your host to remote network segments. It's the exit point for all the packets in your network that have destinations outside your network.
What is default route target? ›
The default-route-target command is typically configured on sessions that a route reflector has with its PE clients. A received default RTC route is never propagated to other routers.
Can a router have 2 default routes? ›
By default, you can only have one default gateway on a system. The case described would lead to asynchronous routing, whereby the router would reject the packets as appropriate.
Is 0.0 0.0 the default route? ›
The default route in Internet Protocol Version 4 (IPv4) is designated as the zero-address 0.0. 0.0/0 in CIDR notation, often called the quad-zero route. The subnet mask is given as /0, which effectively specifies all networks, and is the shortest match possible.
Does a router need a default route? ›
A routing table need not contain all routes in the network to reach all destinations. This simplification is arrived at through the use of a default route .
What is meant by default and explicit routes? ›
When a router does not have an explicit route to a destination IP address, it looks to see if it has a default route in its routing table and, if so, forwards packets for this destination via the default route. In RIP, the default route is represented as the IP address 0.0. 0.0 .
What is the purpose of the default route Quizlet? ›
What is the purpose of the default route? It's where the router sends all packets with destination addresses of which it has no knowledge.
