CCNA Flashcards 2023
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Questions and Answers

Which two statements about the purpose of the OSI model are accurate? (Choose two)

  • Facilitates an understanding of how information travels throughout a network (correct)
  • Defines the network functions that occur at each layer (correct)
  • Is a protocol used for data transfer
  • Is only useful in troubleshooting networking issues
  • What is the default behavior of a Layer 2 switch when a frame with an unknown destination MAC address is received?

    The Layer 2 switch floods packets to all ports except the receiving port in the given VLAN.

    What is the destination MAC address of a broadcast frame?

    ff:ff:ff:ff:ff:ff

    Which action is taken by a switch port enabled for PoE power classification override?

    <p>If a monitored port exceeds the maximum administrative value for power, the port is shutdown and err-disabled.</p> Signup and view all the answers

    In which way does a spine-and-leaf architecture allow for scalability in a network when additional access ports are required?

    <p>A leaf switch can be added with connections to every spine switch.</p> Signup and view all the answers

    A frame that enters a switch fails the Frame Check Sequence. Which two interface counters are incremented? (Choose two)

    <p>Input errors</p> Signup and view all the answers

    What are two reasons that cause late collisions to increment on an Ethernet interface? (Choose two)

    <p>When one side of the connection is configured for half-duplex</p> Signup and view all the answers

    What is the function of a server?

    <p>It provides shared applications to end users.</p> Signup and view all the answers

    What is a function of TFTP in network operations?

    <p>Transfers IOS images from a server to a router for firmware upgrades.</p> Signup and view all the answers

    What are two functions of a server on a network? (Choose two)

    <p>Handles requests from multiple workstations at the same time</p> Signup and view all the answers

    What is the primary function of a Layer 3 device?

    <p>To pass traffic between different networks.</p> Signup and view all the answers

    What is the same for both copper and fiber interfaces when using SFP modules?

    <p>They provide minimal interruption to services by being hot-swappable.</p> Signup and view all the answers

    What is a characteristic of spine-and-leaf architecture?

    <p>Each device is separated by the same number of hops.</p> Signup and view all the answers

    What are two descriptions of three-tier network topologies? (Choose two)

    <p>The network core is designed to maintain continuous connectivity when devices fail</p> Signup and view all the answers

    What benefit does controller-based networking provide versus traditional networking?

    <p>Allows configuration and monitoring of the network from one centralized port.</p> Signup and view all the answers

    Which purpose does a northbound API serve in a controller-based networking architecture?

    <p>Facilitates communication between the controller and the applications.</p> Signup and view all the answers

    What is the name of the layer in the Cisco borderless switched network design that is considered to be the backbone used for high-speed connectivity and fault isolation?

    <p>Core</p> Signup and view all the answers

    What technology should be recommended for a company seeking to interconnect several branch offices with high-speed converged traffic?

    <p>Ethernet WAN</p> Signup and view all the answers

    Which two WAN architecture options help a business improve scalability and reliability for the network? (Choose two)

    <p>Dynamic routing</p> Signup and view all the answers

    Which WAN access technology is preferred for a small office/home office architecture?

    <p>Broadband cable access</p> Signup and view all the answers

    Which two functions are performed by the core layer in a three-tier architecture? (Choose two)

    <p>Ensure timely data transfer between layers</p> Signup and view all the answers

    Which function is performed by the collapsed core layer in a two-tier architecture?

    <p>Enforcing routing policies.</p> Signup and view all the answers

    What identifies the functionality of virtual machines?

    <p>The hypervisor can virtualize physical components including CPU, memory, and storage.</p> Signup and view all the answers

    Study Notes

    OSI Model and Networking Concepts

    • The OSI model defines network functions at each layer, facilitating understanding of information travel within networks.
    • A Layer 2 switch floods packets to all ports except the one that received a frame with an unknown destination MAC address.
    • A broadcast frame has the destination MAC address of ff:ff:ff:ff:ff:ff.

    Power over Ethernet (PoE)

    • A switch port with PoE power classification override shuts down and becomes err-disabled if it exceeds the maximum power threshold.

    Spine and Leaf Architecture

    • In spine-leaf architecture, scalability is achieved by adding leaf switches that connect to all spine switches.

    Network Interface and Errors

    • On a frame that fails the Frame Check Sequence, both CRC and input errors counters are incremented.
    • Late collisions increment due to exceeding cable length limits or a half-duplex configuration on one connection side.

    Server Functions

    • Servers provide shared applications and simultaneously handle requests from multiple workstations.

    TFTP and Network Operations

    • TFTP transfers IOS images from a server to a router, facilitating firmware upgrades.

    Layer 3 Device Functionality

    • The primary function of a Layer 3 device is to pass traffic between different networks.

    SFP Modules

    • Copper and fiber interfaces using SFP modules can be hot-swapped, ensuring minimal service interruption.

    Three-Tier Network Topology

    • In three-tier topologies, the network core maintains connectivity during device failures, while the distribution layer supports both Layer 2 and Layer 3 technologies.

    Controller-based Networking

    • Controller-based networking centralizes configuration and monitoring, improving efficiency compared to traditional setups.

    Northbound API

    • A northbound API in controller-based networking allows communication between the controller and applications.

    Core Layer in Cisco Borderless Network

    • The core layer in Cisco's architecture serves as the backbone for high-speed connectivity and fault isolation.

    Ethernet WAN

    • Ethernet WAN is ideal for interconnecting branch offices, enabling high-speed converged traffic for voice, video, and data.

    WAN Architecture for Scalability

    • Dynamic routing and dual-homed branches are WAN architecture options that enhance network scalability and reliability.

    Preferred WAN Access for Small Offices

    • Broadband cable access is the preferred WAN technology for small office/home office setups.

    Core Layer Functions in Three-Tier Architecture

    • The core layer provides uninterrupted forwarding services and ensures timely data transfer between layers.

    Collapsed Core Layer

    • In two-tier architecture, the collapsed core layer enforces routing policies.

    Virtual Machines Functionality

    • Virtual machines are managed by a hypervisor, which can virtualize components like CPU, memory, and storage.

    Cloud Services and Operating Systems

    • Organizations using cloud services can select platforms allowing the installation of their own operating systems on virtual machines.

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    Description

    Test your knowledge with these flashcards on key concepts from the CCNA curriculum. This quiz includes questions about the OSI model and Layer 2 switch behavior, which are essential for network understanding. Perfect for anyone preparing for their CCNA certification.

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