CCNA培训讲义讲义.ppt

协议基础
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CCNA培训讲义专业知识讲座
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OSI Model Overview
Data Flow
Layers
Transport
Data-Link
Network
Physical
Application
(Upper)
Layers
Session
Presentation
Application
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CCNA培训讲义专业知识讲座
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Role of Application Layers
Telnet
FTP
User Interface
Examples
Application
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CCNA培训讲义专业知识讲座
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Telnet
FTP
ASCII
EBCDIC
JPEG
User Interface
How data is presented
Special processing such as encryption
Examples
Presentation
Application
Role of Application Layers
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CCNA培训讲义专业知识讲座
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Telnet
FTP
ASCII
EBCDIC
JPEG
Keeping different applications’
data separate
User Interface
How data is presented
Special processing such as encryption
Operating System/
Application Access
Scheduling
Examples
Session
Presentation
Application
Role of Application Layers
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CCNA培训讲义专业知识讲座
*
Keeping different applications’ data separate
User interface
How data is presented
Special processing such as encryption
Telnet
FTP
ASCII
EBCDIC
JPEG
Operating System/
Application Access
Scheduling
Transport
Data-Link
Network
Physical
Examples
Session
Presentation
Application
Role of Application Layers
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CCNA培训讲义专业知识讲座
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Role of Data Flow Layers
EIA/TIA-232
Examples
Physical
Move bits between devices
Specifies voltage, wire speed, and pin-out cables
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CCNA培训讲义专业知识讲座
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HDLC
EIA/TIA-232
Examples
Role of Data Flow Layers
Data Link
Physical
Combines bits into bytes and bytes into frames
Access to media using MAC address
Error detection not correction
Move bits between devices
Specifies voltage, wire speed, and pin-out cables
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CCNA培训讲义专业知识讲座
*
/
HDLC
EIA/TIA-232
IP
IPX
Examples
Role of Data Flow Layers
Network
Data Link
Physical
Combines bits into bytes and bytes into frames
Access to media using MAC address
Error detection not correction
Move bits between devices
Specifies voltage, wire speed, and