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Over time, the hierarchical approach to network design has proven the most effective. The three primary layers of a hierarchical campus follow: * Backbone or core- The backbone is the central thoroughfare for corporate traffic. All other parts of the network eventually feed into the backbone. You should design the core to switch packets as quickly as possible. This level should not include operations that might slow the switching of the packet: the distribution layer should handle any packet manipulation or filtering that needs to occur. * Distribution- The distribution layer provides policy-based connectivity and boundaries between the access layers and the core. For example, a building of 20 floors might have a distribution network that connects each of the floors with the backbone. It is at this layer that packets should be filtered or manipulated. Therefore, once packets are "prepped," the core simply needs to switch them quickly to the destination distribution location. * Access- The access layer provides user access to the network. It is at this point that users are permitted (or denied) access into the corporate network. Typically, each person sitting at a desk has a cable that runs back to a wiring closet and connects to a switch; hence, this level is where the user "accesses" the network. The distribution and core layers of the network provide vital services by aggregating groups of users and services. Therefore, if a distribution or core device dies, it can affect large communities of users. For this reason, reducing the chance of failure in these layers reduces and possibly prevents unnecessary and unplanned outages. Redundant network paths, redundant hardware, and fault-tolerant-related network protocols (such as Hot Standby Router Protocol) all aid in the ability of a network to recover quickly (and, you hope, transparently to the users) after a failure.
Source: http://my.safaribooksonline.com/1587200740/ch24
What else can I help you with?
Which layers should support QoS in a hierarchical network?
the access, distribution, and core layers
What are the 3 layers of the cisco hierarchical model?
From a network design standpoint: Core Distribution Access
What are the primary functions of the Transport and Network layers?
to transmit data
What are the three layers of the hierarchical network design model?
A hierarchical network design includes the following three layers:The backbone (core) layer that provides optimal transport between sitesThe distribution layer that provides policy-based connectivityThe local-access layer that provides workgroup/user access to the networkhttp://docwiki.cisco.com/wiki/Internetwork_Design_Guide_--_Internetworking_Design_Basics#Function_of_the_Access_Layer
Which layer in the Internet model are the network support layer?
Physical, Data link and Network layers make the Network Support layers.
Difference between hirarchical network topology and flat network topology?
● Flat: where all the interconnection equipment have the same functions. Topology is easier to implement and has a great ease of management, provided that the network does not increase, then being recommended for small networks. ● Hierarchical: In this model the topology is divided into discrete layers, and each layer is focused on a set of specific functions, allowing the choice correct equipment for each layer. A typical hierarchical topology is composed of layers of core, composed of high-tech equipment, optimized for performance and availability, distribution, where they are concentrated equipment that control the flow of information across the network and access layer, formed by equipment that provides the connections for the network users. Rafael Carvalho
Which set of policies adheres to the hierarchical network model design principles?
Policies that adhere to the hierarchical network model design principles typically include segmentation of the network into distinct layers—core, distribution, and access. This structure promotes scalability, reliability, and efficient traffic management by centralizing routing at the core layer, distributing policies at the distribution layer, and managing endpoint access at the access layer. Additionally, these policies often emphasize redundancy and fault tolerance to ensure high availability and performance across the network. Overall, the focus is on clear separation of roles and responsibilities within each layer to optimize network functionality.
At which stage of development do the primary germ layers form?
The primary germ layers form during the gastrulation stage of development.
What is the difference between network layer and network layer protocol?
A network layer refers to one of the actual 7 layers. The network layer protocol is actually the system it uses, possibly the order that the layers are done by?
Describe the layers of Internet model including their responsibilities Which layers are the network support layers?
John Patterson knows
Which layer is the network support layer?
Physical, Data link and Network layers make the Network Support layers.
Which hierarchical design characteristic would be recommended at both the core and distribution layers to protect the network in the case of a route failure?
The core layer is critical for interconnectivity between distribution layer devices, so it is important for the core to be highly available and redundant, so redundancy is the answer.
