OSI Model Flashcards
What does OSI stand for?
Open Systems Interconnect
OSI Physical Layer
Connects devices together; All the cables and protocols that define how cables are constructed. (Wireless cables use electromagnetic spectrum instead of wires – wireless connection) All the physical “stuff” that connects computers. Are all the cables plugged in?
OSI Data Link Layer
Moves traffic from 1 device to another device. Switches operate at this layer. Mac addresses. Problems with a switch.
Network segment
Collection of network devices that all operate in the same space with the same protocol (OSI Data Link Layer).
OSI Network Layer
Transmission of data from 1 host to another host located on a different network (IP address; IP routing). Routers operate at this layer.
What does TCP stand for ?
Transmission Control Protocol
OSI Transport Layer
Ensures the reliable arrival of messages across a network and provides error-checking mechanisms and data flow controls. Controls how much information is sent at 1 time. TCP, UDP, Port Numbers
What does HTTP stand for ?
Hypertext Transfer Protocol
OSI Application Layer
Provides services for an application program to ensure that effective communication with another application program on a network is possible. Layer the user interacts with. Problem with Chrome or Skype
OSI Presentation Layer
Ensures that the communications that pass through it are in the appropriate form for the recipient application. Layer the operating system works on. Problem with device drivers or operating system.
OSI Session Layer
Controls the connections between multiple computers; deals with communication creates a session between 2 computers. Problems with settings on a web server that are not configured correctly.
OSI Physical Layer (KISS)
Cables, physical hardware
OSI Data Link Layer (KISS)
One device talks to the next device (same network)
OSI Network Layer (KISS)
Addressing scheme; mechanism to move traffic from 1 side of the internet all the way to the other side
OSI Transport Layer (KISS)
Call setup
