Describe how a hierarchical network model is used to design networks. Explain the structured engineering principles for network design: Hierarchy, Modularity, Resiliency, Flexibility. Describe the three layers of a hierarchical network and how they are used in network design. Identify the benefits of a hierarchical design. Describe the Cisco Enterprise Architecture model. Describe the three new business network architectures: borderless network architecture, collaboration network architecture, and the data center or virtualization network architecture.
Chapter 10: Network Design Introduction to Networking Presentation_ID © 2008 Cisco Systems, Inc All rights reserved Cisco Confidential Chapter 10 10.0 Introduction 10.1 Hierarchical Network Design Overview 10.2 Cisco Enterprise Architecture 10.3 Evolving Network Architectures 10.4 Summary Presentation_ID © 2008 Cisco Systems, Inc All rights reserved Cisco Confidential Chapter 10: Objectives Describe how a hierarchical network model is used to design networks Explain the structured engineering principles for network design: Hierarchy, Modularity, Resiliency, Flexibility Describe the three layers of a hierarchical network and how they are used in network design Identify the benefits of a hierarchical design Describe the Cisco Enterprise Architecture model Describe the three new business network architectures: borderless network architecture, collaboration network architecture, and the data center or virtualization network architecture Presentation_ID © 2008 Cisco Systems, Inc All rights reserved Cisco Confidential Devices in a Small Network Small Network Topologies Presentation_ID Typical Small Network Topology © 2008 Cisco Systems, Inc All rights reserved Cisco Confidential 10.1 Hierarchical Network Design Overview Presentation_ID © 2008 Cisco Systems, Inc All rights reserved Cisco Confidential Enterprise Network Campus Design Network Requirements Small network – Provides services for to 200 devices Medium-sized network – Provides services for 200 to 1,000 devices Large network – Provides services for 1,000+ devices Presentation_ID © 2008 Cisco Systems, Inc All rights reserved Cisco Confidential Enterprise Network Campus Design Structured Engineering Principles Presentation_ID © 2008 Cisco Systems, Inc All rights reserved Cisco Confidential Hierarchical Network Design Network Hierarchy Access layer – Provides workgroup or user access to the network Distribution layer – Provides policy-based connectivity Core layer – Provides fast transport between distribution switches Presentation_ID © 2008 Cisco Systems, Inc All rights reserved Cisco Confidential Hierarchical Network Design Access Layer Layer switching High availability Port security QoS classification and marking and trust boundaries Address Resolution Protocol (ARP) inspection Virtual access control lists (VACLs) Spanning tree Power over Ethernet (PoE) and auxiliary VLANs for VoIP Presentation_ID © 2008 Cisco Systems, Inc All rights reserved Cisco Confidential Hierarchical Network Design Distribution Layer Aggregation of LAN or WAN links Policy-based security in the form of access control lists (ACLs) and filtering Routing services between LANs and VLANs and between routing domains (e.g., EIGRP to OSPF) Redundancy and load balancing A boundary for route aggregation and summarization configured on interfaces toward the core layer Presentation_ID © 2008 Cisco Systems, Inc All rights reserved Cisco Confidential 10 Emerging Network Architectures Data Center and Virtualization The data center architecture consists of three components: Cisco Unified Management Solutions – Simplifies and automates the process of deploying IT infrastructure and services with speed and enterprise reliability. Unified Fabric Solutions – Delivers network services to servers, storage, and applications, providing transparent convergence, and scalability Unified Computing Solutions – Cisco’s next-generation data center system unites computing, network, storage access, and virtualization into a cohesive system designed to reduce total cost of ownership (TCO) Presentation_ID © 2008 Cisco Systems, Inc All rights reserved Cisco Confidential 28 Devices in a Small Network Device Selection for a Small Network Presentation_ID Factors to be considered when selecting intermediate devices © 2008 Cisco Systems, Inc All rights reserved Cisco Confidential 29 Devices in a Small Network Addressing for a Small Network IP addressing scheme should be planned, documented and maintained based on the type of devices receiving the address Examples of devices that will be part of the IP design: End devices for users Servers and peripherals Hosts that are accessible from the Internet Intermediary devices Planned IP schemes help the administrator: Track devices and troubleshoot Control access to resources Presentation_ID © 2008 Cisco Systems, Inc All rights reserved Cisco Confidential 30 Devices in a Small Network Redundancy in a Small Network Presentation_ID Redundancy helps to eliminate single points of failure Improves the reliability of the network © 2008 Cisco Systems, Inc All rights reserved Cisco Confidential 31 Devices in a Small Network Design Considerations for a Small Network The following should be included in the network design: Secure file and mail servers in a centralized location Protect the location by physical and logical security measures Create redundancy in the server farm Configure redundant paths to the servers Presentation_ID © 2008 Cisco Systems, Inc All rights reserved Cisco Confidential 32 Protocols in a Small Network Common Applications in a Small Network Network-Aware Applications - software programs used to communicate over the network. Application Layer Services - programs that interface with the network and prepare the data for transfer Presentation_ID © 2008 Cisco Systems, Inc All rights reserved Cisco Confidential 33 Protocols in a Small Network Common Protocols in a Small Network Network Protocols Define: Processes on either end of a communication session Types of messages Syntax of the messages Meaning of informational fields How messages are sent and the expected response Interaction with the next lower layer Presentation_ID © 2008 Cisco Systems, Inc All rights reserved Cisco Confidential 34 Protocols in a Small Network Real-Time Applications for a Small Network Infrastructure - needs to be evaluated to ensure it will support proposed real time applications VoIP is implemented in organizations that still use traditional telephones IP telephony - the IP phone itself performs voice-to-IP conversion Real-time Video Protocols - Use Time Transport Protocol (RTP) and Real-Time Transport Control Protocol (RTCP) Presentation_ID © 2008 Cisco Systems, Inc All rights reserved Cisco Confidential 35 Growing to Larger Networks Scaling a Small Network Important considerations when growing to a larger network: Documentation – physical and logical topology Device inventory – list of devices that use or comprise the network Budget – itemized IT budget, including fiscal year equipment purchasing budget Traffic Analysis – protocols, applications, and services and their respective traffic requirements should be documented Presentation_ID © 2008 Cisco Systems, Inc All rights reserved Cisco Confidential 36 Growing to Larger Networks Protocol Analysis of a Small Network Information gathered by protocol analysis can be used to make decisions on how to manage traffic more efficiently. Presentation_ID © 2008 Cisco Systems, Inc All rights reserved Cisco Confidential 37 Growing to Larger Networks Evolving Protocol Requirements Network administrator can obtain IT “snapshots” of employee application utilization Snapshots track network utilization and traffic flow requirements Snapshots help inform network modifications needed Presentation_ID © 2008 Cisco Systems, Inc All rights reserved Cisco Confidential 38 Summary Presentation_ID © 2008 Cisco Systems, Inc All rights reserved Cisco Confidential 39 Chapter 10: Summary This chapter: Introduced the structured engineering principles of good network design that include hierarchy, modularity, resiliency, and flexibility Explained that the typical enterprise hierarchical LAN campus network design incorporates the access layer, distribution layer, and the core layer Identified that smaller enterprise networks may use a “collapsed core” hierarchy, whereas the distribution and core layer functions are implemented in a single device Presentation_ID Described the benefits of a hierarchical network as scalability, redundancy, performance, and ease of maintenance © 2008 Cisco Systems, Inc All rights reserved Cisco Confidential 40 Chapter 10: Summary Good network design incorporates reliability, scalability, and availability Networks must be secured from viruses, Trojan horses, worms and network attacks Document Basic Network Performance Home networks and small business often use integrated routers, which provide the functions of a switch, router and wireless access point Presentation_ID © 2008 Cisco Systems, Inc All rights reserved Cisco Confidential 41 Presentation_ID © 2008 Cisco Systems, Inc All rights reserved Cisco Confidential 42 ... Modular Network Design Modular Design As the complexity of networks increased, a modular network design has been implemented Modular design separates the network into various functional network. ..Chapter 10 10.0 Introduction 10.1 Hierarchical Network Design Overview 10.2 Cisco Enterprise Architecture 10.3 Evolving Network Architectures 10.4 Summary Presentation_ID ©... Enterprise Network Campus Design Network Requirements Small network – Provides services for to 200 devices Medium-sized network – Provides services for 200 to 1,000 devices Large network –