The OSI Model. 001 011 0 1 1 0 FTP API 7. Application 6. Presentation 5. Session 4. Transport 3. Network 2. Data Link 1. Physical HTTP Software.

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Presentation transcript:

The OSI Model

FTP API 7. Application 6. Presentation 5. Session 4. Transport 3. Network 2. Data Link 1. Physical HTTP Software Layer 7: Application

HTTP 7. Application 6. Presentation 5. Session 4. Transport 3. Network 2. Data Link 1. Physical Format Encrypt Compress Translate Layer 6: Presentation

Connection Termination Prioritize Layer 5: Session 7. Application 6. Presentation 5. Session 4. Transport 3. Network 2. Data Link 1. Physical

7. Application 6. Presentation 5. Session 4. Transport 3. Network 2. Data Link 1. Physical Flow control Retransmission Monitor channel Layer 4: Transport Connection Termination Prioritize Flow control Retransmission Monitor channel Flow control Retransmission Monitor channel

7. Application 6. Presentation 5. Session 4. Transport 3. Network 2. Data Link 1. Physical Routing Error detect Layer 3: Network Flow control Retransmission Monitor channel Flow control Retransmission Monitor channel

7. Application 6. Presentation 5. Session 4. Transport 3. Network 2. Data Link 1. Physical F r a m e Layer 2: Data Link

7. Application 6. Presentation 5. Session 4. Transport 3. Network 2. Data Link 1. Physical Layer 1: Physical

Peering

Encapsulation: Apparent Content Data ICMP Header IP Header ??Layer 3?? Layer 3

Content Data ICMP Header IP Header Encapsulation: Apparent ??Layer 3?? Layer 3

Encapsulation: Actual ICMP Header IP Header Data Segments Info DATA Layer 3

Content Data ICMP Header IP Header Data Ethernet CRC Ethernet Header Encapsulation: Actual Layer 2

Content Data ICMP Header IP Header Data Ethernet CRC Ethernet Header Content Data ICMP Header IP Header Encapsulation: Actual Layer 2