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Session 1
Planning a Network Service
Infrastructure
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Objectives Explain Network Services
Infrastructure design Identify the protocols for the
Network Infrastructure design Identify the Data-Link layer protocol Discuss the Networking services Analyze the Organizational goals
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Network Infrastructure Network Infrastructure consists of:
Physical infrastructure: Provides the basic design of the network
Logical infrastructure: Consists of the software elements that connect, maintain, and provide security to the hosts on the network
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Network Services Infrastructure Stages
Steps in designing a Network Services Infrastructure are: Plan Implement Maintain
Networking Services Infrastructure
Implement
Plan
Maintain
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Selecting the Protocols for the Network
The Open Systems Interconnection (OSI) reference model defines a networking framework for implementing protocols such as TCP/IP and Ethernet
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Selecting the Protocols for the Network Contd…
Physical layer (layer 1) – Specifies the signals transmitted over the network
Data-Link layer (layer 2) – Furnishes transmission protocol knowledge, management and handles errors in the Physical layer
Network layer (layer 3) – Defines the functions that provide communication between computers on different networks
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Selecting the Protocols for the Network Contd…
Transport layer (layer 4) – Guarantees data delivery and ensures error detection
Session layer (layer 5) – Establishes, maintains and ceases connections between applications
Presentation layer (layer 6) – Translates the computer syntax into a readable format
Application layer (layer 7) – Supports application and end-user processes
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Data-Link Layer Protocol We must consider the following criteria
while selecting the Data-Link layer protocol: Type of Media Transmission speed
The most widely used Data-Link layer protocol is the Ethernet
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Types of Media Local Area Networks
are developed using: Unshielded Twisted
Pair (UTP) Transmission Media
Fiber Optic Wireless
Networking
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Transport Layer Protocol Windows Server 2003 supports three
transport layer protocols such as: Transmission Control
Protocol/Internet Protocol (TCP/IP) Internetwork Packet Exchange
(IPX) NetBEUI
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TCP/IP Communicates using the IP (Internet
Protocol), TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) protocols
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IPX Communicates using the following
protocols: Sequenced Packet Exchange
(SPX) – Connection-oriented transport layer protocol
NetWare Core Protocol (NCP) – Equivalent of UDP
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NetBEUI Uses the NetBIOS namespace to
identify computers on the network We can install the NetBEUI on
Windows Server 2003 computer using the installation files to check network communication problems.
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Selecting Networking Services
The network design process involves: Network Foundation Internet Connectivity Integrated Design for
Networking Services Infrastructure
Remote Access Connectivity
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Network Foundation Enables the IP addressing
support, automatic client configuration, and services for name resolution
The networking services are: TCP/IP DHCP DNS WINS
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Internet Connectivity Enables remote users
to access the internal network through the internet without any risk.
The Networking services are: NAT Microsoft Proxy
Server
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Connectivity for Remote Access
While designing the Network services infrastructure, we must use the routing services to connect multiple physical segments placed in the same geographical locations
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Infrastructure design We must provide the required
networking solution to the organization through: Management Strategy Design Combination of services Organizational Network solution
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Analyzing Organizational Goals
While designing the network services infrastructure we must take the following points into consideration: Functionality Security Availability Performance
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Summary Network Services Infrastructure design depends
on the execution of three phases: Plan Implement Maintain
The design process involves: Network Foundation Internet Connectivity Remote Access Connectivity Infrastructure design
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Summary Contd… A Network Infrastructure is made up of the Physical and
the Logical infrastructure The Open Systems Interconnection (OSI) reference
model defines a networking framework for implementing protocols
The Data-Link layer protocol is one of the main decisions to be taken while designing the network infrastructure
Common network services include TCP/IP, DHCP, DNS, and WINS
Remote Access Connectivity can be achieved through IP Routing, Routing and Remote Access, and RADIUS
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