2025-01-07T19:51:20+03:00[Europe/Moscow] en true Contrast Simplex, Half-Duplex, and Full-Duplex connections, Define and describe the OSI Model, How many layers are in the OSI Model?, Define the 7 layers of the OSI Model, in order, Describe the Physical (1st) layer of the OSI Model, What are the 4 functions of the Physical Layer?, Describe the Data Link (2nd) layer of the OSI Model, What are the 5 functions of the Data Link Layer?, Describe the Network (3rd) layer of the OSI Model, What are the 2 functions of the Network Layer?, Describe the Transport (4th) layer of the OSI Model, What are the 5 functions of the Transport Layer?, Describe the Session (5th) layer of the OSI Model, What are the 4 functions of the Session Layer?, Describe the Translation (6th) layer of the OSI Model, What are the 3 functions of the Translation Layer?, Describe the Application (7th) layer of the OSI Model, What are 4 major functions of the Application Layer? flashcards
CompTIA A+ Core 1: OSI Model

CompTIA A+ Core 1: OSI Model

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  • Contrast Simplex, Half-Duplex, and Full-Duplex connections
    Simplex is one-way, Half-Duplex takes turns sending and receiving, Full-Duplex sends and receives simultaneously
  • Define and describe the OSI Model
    The Open Systems Interconnection Model, is a set of rules that explains how different computer systems communicate over a network
  • How many layers are in the OSI Model?
    7
  • Define the 7 layers of the OSI Model, in order
    Physical, Data, Network, Transport, Session, Translation, Application
  • Describe the Physical (1st) layer of the OSI Model
    The physical layer is responsible for the actual physical connection between devices, information is transported in bits, common devices are hubs, modems, repeaters, and cables
  • What are the 4 functions of the Physical Layer?
    Bit Synchronization (Clock setting), Bit Rate Control (Speed setting), Topology (How devices/nodes are arranged), Transmission Mode (How data flows)
  • Describe the Data Link (2nd) layer of the OSI Model
    The Data Link Layer (DLL) is responsible for the node-to-node delivery of the the information, information is transported in frames, common devices are switches and bridges
  • What are the 5 functions of the Data Link Layer?
    Framing (Organizing bits), Physical Addressing (Adding MAC address in header), Error Control (Detect and retransmit errors), Flow Control (Bit Rate Synchronization), Access Control (Determining which device uses the channel at any given time)
  • Describe the Network (3rd) layer of the OSI Model
    The Network Layer is responsible for the transmission of data from one host to another located in different networks, information is transported in packets, common devices are routers and switches
  • What are the 2 functions of the Network Layer?
    Packet Routing (Optimizing the path), Defining the IP Addresses
  • Describe the Transport (4th) layer of the OSI Model
    The Transport Layer facilitates sharing resources between the Network and Application layers, information is transported in segments, common protocols are TCP, UDP, NetBIOS, and PPTP
  • What are the 5 functions of the Transport Layer?
    Segmentation (Breaking the message into smaller units), Flow and Error Control, Assigning Port Numbers, Port Forwarding, Reassembly (Desegmentation)
  • Describe the Session (5th) layer of the OSI Model
    The Session Layer is responsible for the establishment, management, and termination of connections (sessions) between devices
  • What are the 4 functions of the Session Layer?
    Provides authentication and security to NetBIOS and PPTP, Connection Management, Implanting Synchronization Points, Dialog Controller (Facilitating communication in half or full-duplex)
  • Describe the Translation (6th) layer of the OSI Model
    The Translation/Presentation Layer translates the data from the Application layer into a transmittable form, common protocols are JPEG, MPEG, GIF, TSL/SSL
  • What are the 3 functions of the Translation Layer?
    Translation (Converting input data into a transmittable format), Encryption/Decryption, Compression
  • Describe the Application (7th) layer of the OSI Model
    The Application Layer allows the user to interface with the network through an application and produce data for transmission, common protocols are SMTP, FTP, DNS
  • What are 4 major functions of the Application Layer?
    Remote Login, Remote File Access, Mail Services, Directory Services