OSI Layers Flashcards
What is Level 1 of the OSI model?
Application, Data link, Network, Physical, Presentation, Session, or Transport
Media layer or Host layer?
Physical
Media layer
What is Level 2 of the OSI model?
Application, Data link, Network, Physical, Presentation, Session, or Transport
Media layer or Host layer?
Data link
Media layer
What is Level 3 of the OSI model?
Application, Data link, Network, Physical, Presentation, Session, or Transport
Media layer or Host layer?
Network
Media layer
What is Level 4 of the OSI model?
Application, Data link, Network, Physical, Presentation, Session, or Transport
Media layer or Host layer?
Transport
Host layer
What is Level 5 of the OSI model?
Application, Data link, Network, Physical, Presentation, Session, or Transport
Media layer or Host layer?
Session
Host layer
What is Level 6 of the OSI model?
Application, Data link, Network, Physical, Presentation, Session, or Transport
Media layer or Host layer?
Presentation
Host layer
What is Level 7 of the OSI model?
Application, Data link, Network, Physical, Presentation, Session, or Transport
Media layer or Host layer?
Application
Host layer
What is the function of the Application layer?
What is an example of something that operates on that level?
Provides an interface between you and a web application. This layer connects software applications and user experiences, allowing you to access network services and data, such as when you check your email or browse the web.
You compose an email in your email client (e.g., Gmail).
Hypertext Transfer Protocol (HTTP)
File Transfer Protocol (FTP)
Domain Name System (DNS)
Dynamic Host Configuration Protoco (DHCP)
Simple Mail Transfer Protocol (SMTP)
What is the function of the Presentation layer?
What is an example of something that operates on that level?
Translates data between a networking service and an application, ensuring data is formatted, encrypted, and compressed in a way that different systems can understand and use, facilitating interoperability between applications.
Email client translates email into a format suitable for transmission.
Secure Sockets Layer (SSL)
Joint Photographic Experts Group (JPEG)
Portable Network Graphic (PNG)
Musical Instrument Digital Interface (MIDI)
American Standard Code for Information Interchange (ASCII)
What is the function of the Session layer?
What is an example of something that operates on that level?
It establishes, maintains, and terminates connections, ensuring that data exchanges occur efficiently and in an organized manner.
The layer is responsible for session checkpointing and recovery, which allows sessions to resume after interruptions.
The email client establishes a session with the email server.
Session Initiation Protocol (SIP)
Point-to-Point Tunneling Protocol (PPTP)
AppleTalk Data Stream Protocol (ADSP)
What is the function of the Transport layer?
What is an example of something that operates on that level?
Accepts data from the session layer, splits it up into smaller units if need be, passes these to the Network layer, and ensures that all the pieces arrive correctly at the other end.
Breaks email into packets and ensures these packets are sent reliably.
Transmission Control Protocol (TCP)
User Datagram Protocol (UDP)
What is the function of the Network layer?
What is an example of something that operates on that level?
Data routing, forwarding, and addressing.
It determines the best physical path for data to reach its destination based on network conditions, the priority of service, and other factors.
Packets are routed through the internet to the destination email server.
Internet Protocol (IP)
What is the function of the Data link layer?
What is an example of something that operates on that level?
Takes the data bits and creates packets of the data to guarantee reliable transmission. This layer adds source and destination addresses to the data stream as well as information to detect and control transmission errors.
The packets are framed and sent through different nodes and networks.
Ethernet
Point-to-Point Protocol (PPP)
Address Resolution Protocol (ARP)
Spanning Tree Protocol (STP)
What is the function of the Physical layer?
What is an example of something that operates on that level?
Sending computer bits from one device to another along the network. Its role is determining how physical connections to the network are set up, as well as how bits are represented into predictable signals – as they are transmitted either electrically, optically or by radio waves.
Bits are transmitted over physical medium (fiber optics, wireless, etc.)
Ethernet
Wi-Fi
Bluetooth
USB (Universal Serial Bus)
DSL (Digital Subscriber Line)
