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1.
Introducing Network
Design Concepts Designing and Supporting Computer Networks – Chapter 1 Version 4.0 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 1
2.
Objectives
Explain how a hierarchical network design creates a stable, reliable, scalable network Explain what factors need to be considered when the Core Layer of a network is designed and implemented Explain which factors need to be considered when the Distribution Layer of a network is designed and implemented Explain which factors need to be considered when the Access Layer of a network is designed and implemented Describe the benefits and security implications of creating server farms Describe the considerations of an implementation of a wireless network design Describe the factors that affect the implementation of VPNs, including how remote workers can be supported © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 2
3.
Explain How a
Hierarchical Network Design Creates a Stable, Reliable, Scalable Network Network requirements: Ease of management Fast recovery Application response time Fast troubleshooting © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 3
4.
Explain How a
Hierarchical Network Design Creates a Stable, Reliable, Scalable Network Four fundamental network design goals: Scalability Availability Security Manageability © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 4
5.
Explain How a
Hierarchical Network Design Creates a Stable, Reliable, Scalable Network Core Layer: connects Distribution Layer devices Distribution Layer: interconnects smaller LANs Access Layer: provides connections for hosts and end devices © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 5
6.
Explain How a
Hierarchical Network Design Creates a Stable, Reliable, Scalable Network Subdividing the three-layer model into modular areas: Enterprise campus Server farm Enterprise edge © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 6
7.
Explain How a
Hierarchical Network Design Creates a Stable, Reliable, Scalable Network Steps in network design projects: Identify the network requirements Characterize the existing network Design the network topology and solutions © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 7
8.
Explain what Factors
Need to be Considered when Designing the Network Core Layer Network backbone Goals of the Core Layer Provide 100% uptime Maximize throughput Facilitate network growth © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 8
9.
Explain what Factors
Need to be Considered when Designing the Network Core Layer Combining routing and switching in the same device Redundancy and load balancing High-speed and aggregate links Quick convergence © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 9
10.
Explain what Factors
Need to be Considered when Designing the Network Core Layer Full mesh topology Partial mesh topology Failure prevention Reducing human error © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 10
11.
Explain which Factors
Need to be Considered when Designing the Distribution Layer of a Network Filtering and managing traffic flow Access control policies Route summarization Isolating Core Layer from Access Layer failures Routing between VLANs © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 11
12.
Explain which Factors
Need to be Considered when Designing the Distribution Layer of a Network Explain how redundant links improve network reliability and stability © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 12
13.
Explain which Factors
Need to be Considered when Designing the Distribution Layer of a Network Explain how ACLs filter traffic for security and traffic management © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 13
14.
Explain which Factors
Need to be Considered when Designing the Distribution Layer of a Network Explain the concept of route summarization and describe how it is implemented at the Distribution Layer of the network © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 14
15.
Explain which Factors
Need to be Considered when Designing the Access Layer of a Network Physical location of equipment Wiring closets Converged networking Availability © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 15
16.
Explain which Factors
Need to be Considered when Designing the Access Layer of a Network Naming structures VLAN architecture Traffic patterns Prioritization strategies © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 16
17.
Explain which Factors
Need to be Considered when Designing the Access Layer of a Network Star topologies © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 17
18.
Explain which Factors
Need to be Considered when Designing the Access Layer of a Network Functions of VLANs: Separate and classify traffic Control broadcasts Contain VLANs within a single wiring closet © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 18
19.
Explain which Factors
Need to be Considered when Designing the Access Layer of a Network QoS at the network edge: Classification Assigned priority © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 19
20.
Explain which Factors
Need to be Considered when Designing the Access Layer of a Network Security risks at the network edge: Authentication Wireless security © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 20
21.
Explain which Factors
Need to be Considered when Designing the Access Layer of a Network Security measures at the Access Layer: Physical security Strong passwords SSH Disabling unused ports Security policy © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 21
22.
Describe the Benefits
and Security Implications of Creating Server Farms Defined entry and exit points for network traffic Redundant, high-capacity links Load balancing and failover Lower cost of providing services © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 22
23.
Describe the Benefits
and Security Implications of Creating Server Farms Firewalls LAN switch security features Intrusion and prevention systems Load balancers Network analysis and management devices DMZs © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 23
24.
Describe the Benefits
and Security Implications of Creating Server Farms Building in redundancy for high availability Virtualization © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 24
25.
Describe the Considerations
of an Implementation of a Wireless Network Design Customer requirements: Roaming Authentication Services and applications Encryption Coverage and number of users © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 25
26.
Describe the Considerations
of an Implementation of a Wireless Network Design Physical WLAN design Site survey Logical WLAN design Open guest access vs. secured employee access © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 26
27.
Describe the Factors
that Affect the Implementation of VPNs Cost of bandwidth QoS Security Remote access © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 27
28.
Describe the Factors
that Affect the Implementation of VPNs Interconnection options: Traditional WAN technologies Newer WAN technologies © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 28
29.
Describe the Factors
that Affect the Implementation of VPNs Explain ways to provide redundant connectivity to remote sites © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 29
30.
Summary The four
fundamental technical requirements of network design are scalability, availability, security and manageability. Network projects involve identifying the requirements, characterizing the existing network, and designing the network topology and solutions. Redundancy at the Core Layer keeps the network functioning even when a device or link fails. Routing efficiency at the Distribution Layer isolates the Core from Access Layer failures. Using VLANs and IP subnets is the most common way to segregate user groups and traffic within the Access Layer. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 30
31.
© 2006 Cisco
Systems, Inc. All rights reserved. Cisco Public 31