Cisco CCNA Exploration v4 Training - Routing Basics

Cisco CCNA Exploration v4 Training - Routing Basics

Cisco CCNA Exploration v4 Training - Routing Basics

From this article you will learn the concepts of ruting protocols. Routing protocol components and algorithms are discussed here.

Routing -

To pass in CCNA 1, 2, 3, 4, exploration v4 final exams you need to know routing very well. Basically routing is the act of moving information across an internetwork. Sometimes routing is contrasted with the help of bridging.The main difference between routing and bridging is that bridging is Layer 2 and routing is Layer 3. This distinction provides routing and bridging with different information to use in the process of moving information from source to destination, so the two functions accomplish their tasks in different ways.

The topic of routing has been covered in computer science literature for more than two decades, but routing achieved commercial popularity as late as the mid-1980s. The primary reason for this time lag is that networks in the 1970s were simple, homogeneous environments. Only relatively recently has large-scale internetworking become popular.Follow the link to get ccna 1 exploration v4 questions.

Routing Components

Routing involves two basic activities: determining optimal routing paths and transporting information groups (typically called packets) through an internetwork. In the context of the routing process, the latter of these is referred to as packet switching. Although packet switching is relatively straightforward, path determination can be very complex.

Path Determination

Routing protocols use metrics to evaluate what path will be the best for a packet to travel. A metric is a standard of measurement, such as path bandwidth, that is used by routing algorithms to determine the optimal path to a destination. To aid the process of path determination, routing algorithms initialize and maintain routing tables, which contain route information. Route information varies depending on the routing algorithm used.

Routing algorithms fill routing tables with a variety of information. Destination/next hop associations tell a router that a particular destination can be reached optimally by sending the packet to a particular router representing the "next hop" on the way to the final destination. When a router receives an incoming packet, it checks the destination address and attempts to associate this address with a next hop. Figure 5-1 depicts a sample destination/next hop routing table.

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