Configuring Static Routing Flashcards
Determine the destination network address of the packet that needs to be routed by using the subnet mask.
Identify the destination of the packet
Determine from which sources a router can learn paths to network destinations.
Identify the sources of routing information
Determine sources from which a router can learn paths to network destinations.
Identify routes
Select the best path to the intended destination.
Select routes
Update known routes and the selected route according to network conditions
Maintain and verify routing information
The router learns routes when an administrator manually configures the static route. The administrator must manually update this static route entry whenever an internetwork topology change requires an update. Static routes are user-defined routes that specify the outgoing interface on the router when packets should be sent to a specific destination.
Static routing
The router dynamically learns routes after an administrator configures a routing protocol that determines routes to remote networks. Unlike the situation with static routes, after the network administrator enables dynamic routing, the routing process automatically updates the routing table whenever the device receives new topology information.
Dynamic routing
- A network administrator manually enters static routes into the router.
- A network topology change requires a manual update to the route.
- Routing behavior can be precisely controlled.
Static Routes
- A network routing protocol automatically adjusts dynamic routes when the topology or traffic changes.
- Routers learn and maintain routes to the remote destinations by exchanging routing updates.
- Routers discover new networks or other changes in the topology by sharing routing table information.
Dynamic Routes
Static routing does not consume network bandwidth and the central processing unit (CPU) resources of the router. When you use a routing protocol, the traffic between routers adds some overhead as the routers exchange routing updates about remote networks.
Conserving router resources
Static routes are commonly used in small networks that have few routers. Many small networks are designed as stub networks (a network that is accessed by a single link); for these types of networks, static routes are the most appropriate solution.
Simple to configure in a small network
Sometimes, you may want to define static routes to control the data transmission paths that are used by your data. This option may be useful in highly secure environments.
Security
Static routing might be appropriate for networks that have fewer than four or five routers. Dynamic routing is more appropriate for large networks to reduce the probability of errors in a routing configuration. If planned, designed and implemented correctly, the network can be expanded very easily to meet future demands. Using dynamic instead of static routing helps the expansion process of the network and does not require significant redesign of the existing network infrastructure from scratch.
Scalability
If your network changes and you do not update the static routes, your router does not have accurate knowledge of your network. Not having accurate knowledge of your network can result in lost or delayed data transmissions.
Accuracy
When the number of routers increases, the number of static routes also increases. In large networks, adding even one router with only one new network means that in addition to configuring the newly added router with static routes to other networks, you must configure all existing routers in the network with static routes to the new network.
High maintenance
