CCNA 4 Hierarchical Network Design

CCNA 4 Hierarchical Network Design

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  CHAPTER 1 HIERARCHICAL NETWORK DESIGN AlvaradoCovarrubias Jonathan Ezequiel Alarcón García Nayeli Anayansi González Hernández Erick Márquez Díaz Areli Priscila Guillermo Contreras José Alberto Sánchez Acuña Roberto de Jesús López Pérez Cynthia Viridiana Becerra Camarena Josué Roberto
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  • In designinga network it is necessary to categorize the network depending on the number of devices that serve • A small network provides services to 200 devices • A medium network provides services 200-1000 devices • a large network provides services to more than 1000 devices • Network designs require great knowledge and experience to identify potential network expansions. NETWORK REQUIREMENTS
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  STRUCTURED ENGINEERING PRINCIPLES • Fora network designer, is indispensible have with a network design that can comply with the challenges of connect a lot of areas in a enterprice. To do it, exist rules of engineering that should be follow: • °Hierarchy: Make possible that the network can be divided in areas more small and can be more easy to manage. • °Modularity: Separate the network in functions that exist in this, to best design. • °Resistance where the network should be prepared to resist and work normal and abnormal conditions. • °Flexibility, this capacity permit that the network can be update or implement new sections or add news devices to the network. •
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  HIERARCHICAL NETWORK DESIGN •Hierarchical models apply to both LAN and WAN design.(LAN Local Area Network and WAN Wide Area Network ) • A typical enterprise hierarchical LAN campus network design includes the following three layers: • Access layer - Provides workgroup/user access to the network. • Distribution layer - Provides policy-based connectivity and controls the boundary between the access and core layers. • Core layer - Provides fast transport between distribution switches within the enterprise campus. •
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  ACCESS LAYER • Theaccess layer grants end devices access to the network. In the WAN environment, it may provide teleworkers or remote sites access to the corporate network across WAN connections. • Generally incorporates Layer 2 switches and access points providing connectivity. • The access layer serves a number of functions including: • Layer 2 switching • High availability • Port security • QoS classification and marking and trust boundaries • Address Resolution Protocol (ARP) inspection • VLAN Access Control List (VACL) • Spanning tree • Power over Ethernet (PoE) and auxiliary VLANs for VoIP
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  DISTRIBUTION LAYER • thedistribution layer is the boundary between the Layer 2 domains and the Layer 3 routed network. • simarizacion aggregation and towards the core layers • aggregation LINKS WAN LAN • Routing services between LANs and VLANs and between routing domains • filtering acl • Redundancy and load balancing • Broadcast domain control,
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  CORE LAYER • Thecore layer is critical for interconnectivity between distribution layer devices; for example, interconnecting the distribution block to the WAN and Internet edge. • Some considerations at the core layer are: Providing high-speed switching (i.e., fast transport) Providing reliability and fault tolerance Scaling by using faster, and not more, equipment. • Avoiding CPU-intensive packet manipulation caused by security, inspection, quality of service • The core layer must be capable of forwarding large amounts of data quickly.
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  TWO-TIER COLLAPSED COREDESIGN • The three-tier hierarchical design maximizes performance, network availability, and the ability to scale the network design. • A “collapsed core” is when the distribution layer and core layer functions are implemented by a single device. The primary motivation for the collapsed core design is reducing network cost, while maintaining most of the benefits of the three-tier hierarchical model. •
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  MODULAR DESIGN • Amodular network design separates the network into several modules functional network , and each of these points to a place or a specific purpose in the network. • The use of modules in the network design provides flexibility and facilitates its implementation and troubleshooting, allowing more control detailed security.
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  MODULAR DESIGN • Amodular approach to network design further divides the three-layer hierarchical design, by pulling out specific blocks or modular areas. These basic modules are connected together via the core of the network. • Access-distribution - Also called the distribution block • Services - This is a generic block used to identify services such as centralized Lightweight Access Point Protocol (LWAPP) wireless controllers, unified communications services, policy gateways. • • Data center - Originally called the server farm. This block is responsible for managing and maintaining many data systems that are vital to modern business operations. • Enterprise Edge - Consists of the Internet Edge and the WAN Edge. •
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  CISCO ENTERPRISE ARCHITECTURE MODEL •For have the need of Modularity in a network, Cisco design the model of owner architecture, called “modules”. This scheme permit major flexibility in the network design and provided the resolution of problems. Some modules or the architecture of Cisco: • Managerial campus • Enterprise Edge • End of the service provider •
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  CISCO ENTERPRISE CAMPUS •A campus network is a building or group of buildings connected to a corporate network consisting of many LAN. • Enterprise campus module consists of the following submodules: • Access to the building • Building Distribution • Core campus • Data center
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  CISCO ENTERPRISE ARCHITECTURE MODEL •The enterprise edge module provides connectivity for voice, video, and data services outside the enterprise. • The enterprise edge module consists of the following submodules: • E-commerce networks and servers • The e-commerce submodule enables enterprises to support e-commerce applications through the Internet. It uses the high availability designs of the data center module. • Internet connectivity and demilitarized zone (DMZ) • The Internet submodule of the enterprise edge provides internal users with secure connectivity to Internet services such as public servers, email, and DNS. • Remote Access and VPN • The VPN/remote access submodule of the enterprise edge provides remote-access termination services, including authentication for remote users and sites. • WAN • The WAN submodule uses various WAN technologies for routing traffic between remote sites and the central site. •
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  SERVICE PROVIDER EDGE •Enterprises use Service Providers (SPs) to link to other sites. As shown in Figure 1, the SP edge module can include: • Internet Service Providers (ISPs) • WAN services such as Frame Relay, ATM, and MAN • Public Switched Telephone Network (PSTN) services
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  REMOTE FUNCTIONAL AREA •This area is responsible for remote connectivity options and includes several modules, it includes several modules, • Enterprise Branch: The enterprise branch module includes remote branches that allow employees to work at non-campus locations. • The enterprise branch module allows enterprises to extend head- office applications and services, such as security, Cisco Unified Communications, and advanced application performance, to the remote branches. • Enterprise Teleworker:is responsible for providing connectivity for workers who operate out of different geographically dispersed locations. • Enterprise Data Center: is a data center with all of the same functional options as a campus data center, but exists at a remote location
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  IT CHALLENGES BYOD • Thenetworks are going to be a transportation system only data composed of LAN devices connected to a system that connects people, devices and information in a converged network environment and with a variety of means .
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  EMERGING ENTERPRISE ARCHITECTURES • Toemerging network trends, new business network architectures are necessary. • Cisco Borderless Network Architecture • Collaboration Architecture • Data Center/Virtualization Architecture
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  CISCO BORDERLESS NETWORKS •The architecture Cisco Borderless Network it is a solution of network that allows that the organizations and the persons should connect in a sure way, with confidence and without disadvantages to the managerial network in an environment BYOD (Bring Your Own Device). • The architecture Borderless Network admits an extremely sure network and from high performance to that a wide variety of devices can accede. Must be the sufficiently flexible thing in order that it could climb and in order that it admits the future growth into terms of the managerial expansion, included the computer science BYOD, mobile and into the cloud. •