CCNA Flashcards 2023

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?

If a monitored port exceeds the maximum administrative value for power, the port is shutdown and err-disabled. 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?

A leaf switch can be added with connections to every spine switch. 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)

Input errors Signup and view all the answers

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

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

What is the function of a server?

It provides shared applications to end users. Signup and view all the answers

What is a function of TFTP in network operations?

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

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

Handles requests from multiple workstations at the same time Signup and view all the answers

What is the primary function of a Layer 3 device?

To pass traffic between different networks. Signup and view all the answers

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

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

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

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

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

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

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

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

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

Facilitates communication between the controller and the applications. 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?

Core 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?

Ethernet WAN Signup and view all the answers

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

Dynamic routing Signup and view all the answers

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

Broadband cable access Signup and view all the answers

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

Ensure timely data transfer between layers Signup and view all the answers

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

Enforcing routing policies. Signup and view all the answers

What identifies the functionality of virtual machines?

The hypervisor can virtualize physical components including CPU, memory, and storage. 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.