CISCO PROTOCOLES CONCEPTS DE ROUTAGE ET SCURIT PDF

Uninformed management stations lose access to the router through Before you enable the Management Plane Protection feature, you should understand the following concepts: Examples of protocols processed in the management plane are . Cisco IOS Security Configuration Guide, Release Chapters in a configuration guide describe protocols, configuration tasks, and . Within Cisco IOS software documentation, the term router is generally used to .. concept of a trusted third party that performs secure verification of users and. Last modified by Deonte R. Carroll on Sep 19, AM. Visibility: Open to anyone. nt Routing Protocols and

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Routing algorithms can be differentiated based on several key characteristics. Some network links might go down more often than others. Network protocols occur at the upper five layers of the OSI reference model: This section scuurit describe the process of setting up a key chain for use with RIP and EIGRP then cover the configuration of the specific authentication configuration required by each protocol.

Static routing algorithms are hardly algorithms at all, but are table mappings established by the network administrator before the beginning of routing. The cncepts of routing has been covered in computer science literature for more than two decades, but routing achieved commercial popularity as late as the mids.

Once a key chain has been configured, the authentication for EIGRP neighbors is enabled on each interface that is connected to an clsco neighbor. When a network event causes routes to either go down or become available, routers distribute routing update messages that permeate networks, stimulating recalculation of optimal routes and eventually causing all routers wt agree on these routes. Link information also can be used to build a complete picture of network topology to enable routers to determine optimal routes to network destinations.

If not, the next hop is usually another router, which executes the same switching decision process.

Routing Basics – DocWiki

These mappings do not change unless the network administrator alters them. Routing protocols use metrics to evaluate what path will be the best for a packet to travel. Because intradomain routers need to know only about other routers within their protocolex, their routing algorithms can be simplified, and, depending on the routing algorithm being used, routing update traffic can be reduced accordingly.

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Routing algorithms have used many different metrics to determine the best route.

Finally, routing algorithms use a variety of metrics that affect calculation of optimal routes. Sophisticated routing algorithms can base route selection on multiple metrics, combining them in a single concepte metric.

ISs are further divided into those that can communicate within routing domains intradomain ISs and those that communicate both within and between routing domains interdomain ISs.

Personal tools Log in. Because static routing systems cannot react to network changes, they generally are considered unsuitable for today’s large, constantly changing networks. This article takes a look at the available routing protocol authentication options for the most often used routing protocols: The key chain functionality provides a mechanism for storing a number of different electronic keys, the key string value that is associated with a specific key and the lifetime conceepts the key is valid.

This article introduces the underlying concepts widely used in routing protocols. Monitoring these parameters on a continual basis can be resource-intensive itself. They can provide substantially better throughput and reliability.

Routing is often contrasted with bridging, which might seem to accomplish precisely the same thing to the casual observer. Reliability, in the context of routing algorithms, refers to the dependability usually described in terms of the bit-error rate of each network link.

This is generally called load sharing. Router 1 already has been updated and thus knows that the optimal route to the destination calls for Router 2 to be the next stop.

Link-state algorithms also known as shortest path first algorithms flood routing information to all nodes routqge the internetwork.

Retrieved from ” http: 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. This includes the ability to have keys that potentially overlap in the time that they are valid. Routing systems often designate logical groups of nodes, called domains, autonomous systems, wt areas.

Switching algorithms is relatively simple; it is the same for most routing protocols. In other words, the routing algorithm doutage offer its functionality efficiently, with a minimum of software and utilization overhead. A link-state advertisement, another example of a message sent between routers, informs other routers of the state of the sender’s links.

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Routing Protocol Authentication Concepts and Configuration

Configuring the use of routing protocol authentication is an easy option that ensures that the device on the other side of a connection conceptw who they say they are. The integrity of routing information inside a network is of the utmost importance as it can influence how traffic reaches specific destinations.

Other algorithms assume that hosts know nothing about routes. In the latter system, routers have the routing intelligence. The primary advantage of hierarchical routing is that it mimics the organization of most companies and therefore supports their traffic patterns well. As it examines the packet’s destination protocol address, the router determines that it either knows or does not know how to forward the packet to the next hop. Naturally, routing protocols must define their metric calculation algorithms strictly.

The configuration required to setup a key chain are shown in Table 4. A – Static, dynamic, flat, hierarchical, host-intelligent, router-intelligent, intradomain, interdomain, link-state, and distance vector.

Routing Basics

In general, routed protocols in this context also are referred to as network protocols. Having acquired a router’s address by some means, the source host sends a packet addressed specifically to a router’s physical Media Access Control [MAC]-layer address, this time with the protocol network layer address of the destination host.

It stands to reason, therefore, that an optimal intradomain-routing algorithm would not necessarily be an optimal interdomain-routing algorithm. Some sophisticated routing protocols support multiple paths to the same destination. Routing protocols, on the other hand, are protocols that implement routing algorithms.

The International Organization for Standardization ISO has developed a hierarchical terminology that is useful in describing this process.