CCNA Training in Cochin | Thrissur | Trivandrum | Kerala

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• ISO 9001 2008 Certified Company

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THRISSUR KOCHI
TRIVANDRUM
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Introduction to Networking

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Icons used in this Seminar / Workshop
PC
Router
Server
Firewall
ISP Cloud
Modem / SOHO Router
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Open Networks
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Closed Networks
Attacks from inside the network remain a threat.
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What Is a Network?
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Common Physical Components of a Network
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Connection to the Internet
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Open Systems Interconnection (OSI) Layers
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Understanding Host-to-Host Communications

• Older Model
• Proprietary
• Application and combinations software controlled
  by one vendor
• Standards Based Model
• Multivendor software
• Layered approach

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Why a Layered Network Model?

• Reduces complexity
• Standardizes interfaces
• Facilitates modular engineering
• Ensures interoperable technology
• Accelerates evolution
• Simplifies teaching and learning

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The Seven Layers of the OSI Model
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The Seven Layers of the OSI Model (Cont.)
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The Seven Layers of the OSI Model (Cont.)
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The Seven Layers of the OSI Model (Cont.)
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The Seven Layers of the OSI Model (Cont.)
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The Seven Layers of the OSI Model (Cont.)
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The Seven Layers of the OSI Model (Cont.)
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TCP/IP Stack

• Defines four layers
• Uses different names for Layers 1 through 3
• Combines Layers 5 through 7 into single
  application layer

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TCP/IP Stack vs. the OSI Model
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