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ReactorMany protocols can operate at multiple layers.
Nebulous is Industry’s consensus to where many protocols best reside.
| ITIL Network+ OSI Model Ports IEEE Cables IPv4 IPv6 Security+ |
Open Systems Interconnection (OSI) ≈ Transmission Control Protocol / Internet Protocol (TCP/IP)
Popular mnemonic reminders:
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Dead Ninja Turtles Smell Pretty Awful Please Do Not Touch Steve's Pet Alligator A Priest Saw Ten Nuns Doing Pushups Please Do Not Trust Sales Person’s Answers All People Seem To Need Data Processing Please Do Not Throw Sausage Pizza Away |
OSI Reference Model: Cisco OSI Model - Professor Messer
Introduction to Ethernet - Professor Messer
Useful Images
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Ethernet Frame
IEEE 802.3 standard defined the minimum Ethernet frame size as 64 bytes, and the maximum as 1518 bytes. The maximum was later increased to 1522 bytes to allow for VLAN tagging. |
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Routers separate broadcast domains |
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Switches separate collision domains |
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Goodput = Data without overhead protocol bits
In a changing world, how quickly things become obsolete
ASA - Adaptive Security Appliance LAYER 3
PPP - LCP/NCP - Network Control Protocol - Layer 3
FIM - File Integrity Monitoring
SDN = Software-Defined Networking
Switch - ASIC = Application-specific integrated circuit - Layer 2
Fibre Channel (FC) - three main components?
LACP - Link Aggregation Control Protocol = Layer 2 or 3
SASL - with LDAPv3 Simple Authentication and Security Layer
WINS = Windows Internet NamesService - like DNS but uses computer names
SNAT - Static NAT
SCADA = Supervisory Control and Data Acquisition, A.K.A. = ICS = Industrial Control Sysytem
FHRP = First Hop Redundancy Protocol - creates redundant default gateway on a router
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