CISCO PROTOCOLES CONCEPTS DE ROUTAGE ET SCURIT PDF

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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Routers compare metrics to determine optimal routes, and these metrics differ depending on the design of the routing algorithm used.

Routing Protocol Authentication Concepts and Configuration

In most cases, a host determines that it must send a packet to another host. Personal tools Log in. A routing domain generally is considered a portion of an internetwork under common administrative authority that is regulated by a particular set of administrative guidelines.

Routing protocols, on the other hand, are protocols that implement routing algorithms. If the router does not know how to forward the packet, it typically drops the packet. Put simply, routing protocols are used by intermediate systems to build tables used in determining path selection of routed protocols. In hierarchical systems, some routers in a domain can communicate with routers in other domains, while others can communicate only with routers within their domain.

These messages permeate the network, stimulating routers to rerun their algorithms and change their routing tables accordingly. 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.

If the router knows how to forward the packet, however, it changes the destination physical address to that of the csurit hop and transmits the packet. Load refers to the degree to which a network resource, such cocepts a router, is busy. Other algorithms assume that hosts know nothing about routes. The primary reason for this time lag is that networks in the s were simple, homogeneous environments.

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The nature of these two algorithm types is different. Routing systems often designate logical groups of nodes, called domains, autonomous systems, or areas. Retrieved from ” http: The advantages of multipath algorithms are obvious: First, the particular goals of the algorithm designer affect the operation of the resulting routing protocol. Routing algorithms must be robust, which means that they should perform correctly in the face of unusual or unforeseen circumstances, such as hardware failures, high load conditions, and incorrect implementations.

The key chain conepts 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 that the key is valid.

What is the specific nature of the information that they contain? Link-state algorithms, therefore, can be more expensive to implement and support. Routing domains are also called autonomous systems.

Once a key chain has been configured, the authentication for EIGRP neighbors is enabled on protoocoles interface that is connected to an authenticating neighbor.

The key chain configuration provides the ability to setup multiple keys that can be used by the supporting features. Distance vector algorithms also known as Bellman-Ford algorithms call for each router to send all or some portion of its dw table, but only to its neighbors. Most network communication occurs within small company groups domains. Optimality refers to the capability of the routing algorithm to select the best route, which depends on the metrics and metric weightings used to make the calculation.

As the packet moves through the internetwork, its physical address changes, but its protocol address remains constant, as illustrated in Figure: Routing delay refers to the length of time required to move a packet from source to destination through the internetwork. The primary advantage of hierarchical routing is that it mimics the organization of most companies and therefore supports their traffic patterns well. Some sophisticated routing protocols support multiple paths to the same destination.

The primary difference between the two is that bridging occurs at Layer 2 the link layer of the OSI reference model, whereas routing occurs at Layer 3 the network layer. Although line delay may be longer, they will send packets over their own lines rather than through the public lines that cost money for usage time.

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Routing Basics – DocWiki

This includes the ability to have keys that potentially overlap in the time that they are valid. The next hop may be the ultimate destination host. Keep in mind that these authentication solutions do not encrypt the information exchanged between the devices, but simply verifies that the identity of these devices.

Network protocols occur at the upper five layers of the OSI reference model: Because static routing systems cannot react to network changes, they generally are considered unsuitable for today’s large, constantly changing networks.

Step 1 Enter privileged mode. At this point, they travel from the last backbone router through one or more nonbackbone routers to the final destination. Route information varies depending on the routing algorithm used.

In this case, path length is the sum of the costs associated with each link traversed. Routing involves two basic activities: But how, specifically, are routing tables built? Routing is the act of moving information across an internetwork from a source to a destination.

Link-state protocols are generally more scalable than distance vector protocols.

OSPF supports two different types of authentication that can be configured: All other things being equal, a Mbps Ethernet link would be preferable to a kbps leased line. Other routing protocols define hop count, a metric that specifies the number of passes through internetworking products, such as routers, that a packet must take en route from a source to a destination.

In link-state algorithms, each router builds a picture of the entire network in its routing tables. Routing algorithms that converge slowly can cause routing loops or network outages.

Configure the use of RIP authentication. Confusion about the terms routed protocol and routing protocol is common. These network protocols perform a variety of functions required for communication between user applications in source and destination devices, protocoels these functions can differ widely among protocol suites.

Topics summarized here include routing protocol components and algorithms.

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