Network Design - Internet Engineering - Lecture Slides, Slides of Internet and Information Access

These lecture slides are very easy to understand the internet.The major points in these lecture slides are:Network Design, Define, Organization Network, Appropriate Solutions, Identify Important Factors, Network Design, Find Appropriate Structure, Budget, Nature of Applications, Availability of Expertise

Typology: Slides

2012/2013

Uploaded on 04/25/2013

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Internet Engineering Course
Network Design
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Internet Engineering Course

Network Design

Contents

  • Define and analyse an organization network

requirements

  • Discuss about the appropriate solutions
    • Identify important factors in network design
    • Find appropriate structure

Small sized Network (<80 users)

  • Low budget for IT expense
  • Little expertise in various technologies
  • Mostly off the shelf applications
    • Low bandwidth consumption
  • Mostly basic requirements, such as email, word

processing, printing and file sharing

  • One or two administrators
    • Responsible for every aspects of network (generalist)
    • Server management, backup tasks, connecting new devices, installation of workstations and troubleshooting PC problems

Requirements for SSN

  • Low cost equipment
  • Shared bandwidth for most users, switched for a

selective few

  • A central switch acting as a backbone
  • Flat network design
  • Little fault tolerance
  • Minimal management required
  • High growth provisioning of 20-50%

Connectivity design

  • The aim is to have a design that is both cost effective and provisioned for future expansion
  • There is a server room with all the connecting devices and servers
  • The printers are fitted with built in Ethernet ports distributed in the building
  • There are two groups of users, power users group and non power users
  • Power group need to print a lot of documentation, take large documents from server or save presentation files into the server

Connectivity design (cont.)

  • Non power users do more manual tasks such

as answering phone calls

  • They use the network mainly for reading

emails and do some simple word processing

  • They use low-end PCs

Physical diagram – expansion plan

Logical network design

Addressing and Naming

  • For this size of network a Class C address should be used.
  • A private Class C address is used: 192.168.1.0 to 192.168.1.
  • Dynamic or Static IP assignment?
    • It might be hard and maintain a DHCP server
    • Therefore for small sized network we may decide to use static IPs.
  • How about a DNS server?
    • Again setting and maintaining a DNS for this size of network may not be beneficial
    • Therefore a simple naming scheme maybe used

Connecting the network to the

Internet

  • In the design we used private IP addresses:
    • Computers can’t use Internet directly, there is a need for NAT functionality
    • There exists the advantage of security of network
  • It is decided to use a router with built-in NAT

functionality

  • It is not cost effective to host email and Web service

inside the organization

  • Therefore such servers are outsourced

A sample firm

  • Connecting 300 users to a network
  • The company has a AS/400 host and 8 Windows NT file servers
  • There are 6 departments in the company, each with its own applications: - Marketing – mainly email with external customers, calendaring, word processing, presentation applications - Customer support – mainly handling customer queries, accessing the host for in-house developed applications - MIS – development of applications on AS/ - Human Resources – Mainly word processing - Engineering – make use of CAD/CAM workstations

Connectivity design

  • Power users, such as the Engineering department, will have 100 Mbps switched connections to the desktop
  • Because Marketing users deal with graphics presentation, they will be connected to the 10 Mbps switch in a ratio of 16 users to a switch.
  • Since Customer Support and Human Resources users require fewer computing resources, they are connected to the 10 Mbps switch in a ratio of 24 to a switch.
  • Except for the server in the Engineering department, all the servers are
  • connected to the backbone switch at 100 Mbps. The engineering server is connected to the switch in the Engineering department at 100 Mbps.

Logical network design

Logical network design (cont.)

  • With a network of this size it is beneficial to

have a DHCP server

  • Also it is better to have a DNS for name

resolution: