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OSI nmeumonic
- All
- People
- Seem
- To
- Need
- Data
- Processing
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OSI Layer 1
- Physical: Signaling, cabling, connectors
- no protocols
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OSI Layer 2
- Data: basic foundation of communication
- Data link protocols (DLC): MAC address
- Network switches
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OSI Layer 3
- Network: "routing" layer
- Internet Protocol (IP)
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OSI Layer 4
- Transport: "post office" layer
- TCP/UDP
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OSI Layer 5
- Session: start, stop, restart
- duplexes, control protocols, tunneling
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OSI Layer 6
- Presentation: Character encoding
- binary to text
- often combined with application layer
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OSI Layer 7
- Application: The layer we see
- HTTP, FTP, DNS, POP3
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ARP
- Address Resolution Protocol
- MAC addresses
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TCP/IP Model
- Application
- Transport
- Internet
- Link
- (All Trains Into London)
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Examples of OSI Layer 2
- Data Link
- Frame, MAC address, Extended Unique Identifier, Switch
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Examples of OSI Layer 3
- Network
- IP, Router, Packet
- All items in layer 3-7 are encapsulated within packets
-
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Examples of OSI Layer 5
- Session
- Control protocols, tunneling
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Examples of OSI Layer 6
Encryption (SSL, TLS)
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RFC 1918
Local (private) IP addressing
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EUI-64
- Used in IPv6, Firewire
- 8-bytes, hexadecimal
- first 3: from IEEE to organization
- last 5: sequential from manufacturer
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MAC Address
- 6 bytes, hexadecimal
- first 3 bytes, assigned by IEEE to organization
- second 3 bytes, sequential order from manufacturer
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