Week 1 Flashcards
What is the OSI Model?
The Open Systems Interconnection reference model is a guide that describes the process that data takes as it traverses a network.
Layer 7
Application
Layer 6
Presentation
Layer 5
Session
Layer 4
Transport
Layer 3
Network
Layer 2
Data Link
Layer 1
Physical
Physical Layer
Where physical signals are sent through cables within a network
Data Link Layer
Switching Layer:
Where MAC (Media Access Control) addresses are used to communicate between devices on the network
Network Layer
Routing Layer:
Where frames are fragmented to communicate between IP addresses
Transport Layer
Post office Layer:
Describes how and where data is being delivered into a system (TCP/UDP)
Session Layer
Where communication between endpoints are managed (started/stopped)
Presentation Layer
Where data is translated into a legible form and application encryption occurs
Application Layer
Where data is made visible at an endpoint
What is a network?
A network is a collection of network-enabled devices (communicable devices with network capabilities)
PAN
Personal Area Network:
Provides networking needs regarding an individual
(ex. Devices communicate without an access point; via Bluetooth)
LAN
Local Area Network:
Provides networking needs regarding a single location, often requiring authentication and authorization to access
(ex. Office, school, hospital, etc.)
MAN
Metropolitan Area Network:
Provides networking capabilities between different LANs within a city
WAN
Wide Area Network:
Provides networking capabilities between different geographical locations, locally or worldwide (VPN manages communication)
Bus Topology
Each network device is connected to a single cable
Ring Topology
Each network device is connected to its neighbor(s)
Mesh Topology
Each device on the network is connected to every other device either physically or logically using network protocols
Star Topology
Each device on the network is connected to a centralized hub or switch
