Network Architecture: 3-Tier Architecture Explained
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Questions and Answers

What is the primary function of the devices in the access layer?

  • To route traffic between devices
  • To connect multiple layer 3 switches together
  • To provide access to the network for devices (correct)
  • To switch traffic between layer 2 switches

    • What type of switch is likely to be used in the second tier of a three-tier architecture?

  • Layer 3 switch
  • Multilayer switch (correct)
  • Core switch
  • Layer 2 switch

    • What is the problem that a three-tier architecture solves?

  • Device communication between different layer 2 switches (correct)
  • Device communication with the internet
  • Device communication within the same layer 2 switch
  • Device communication between different networks

    • What is the purpose of the top tier in a three-tier architecture?

    <p>To connect devices to the network</p> Signup and view all the answers

    What is another name for a multilayer switch?

    <p>Switch router</p> Signup and view all the answers

    How many tiers are there in a three-tier architecture?

    <p>3</p> Signup and view all the answers

    What type of devices are typically connected to a layer 2 switch?

    <p>Networked attached devices</p> Signup and view all the answers

    What is the benefit of using a multilayer switch in a three-tier architecture?

    <p>It enables layer 3 routing and layer 2 forwarding</p> Signup and view all the answers

    What is the primary purpose of cross-connecting device three and device four in the distribution layer?

    <p>To provide fault tolerance in case of a single device failure</p> Signup and view all the answers

    What is the term used to describe the layer that consists of devices three, four, E, F, G, and H?

    <p>Distribution Layer</p> Signup and view all the answers

    In the three-tier architecture, what is the primary function of the core layer?

    <p>To interconnect multiple blocks</p> Signup and view all the answers

    In the two-tier architecture, what is typically found at the top of a rack in a data center?

    <p>A rack switch</p> Signup and view all the answers

    What is the primary advantage of the two-tier architecture over the three-tier architecture?

    <p>Reduced number of devices</p> Signup and view all the answers

    Which of the following is NOT a characteristic of the three-tier architecture?

    <p>Single point of failure at the access layer</p> Signup and view all the answers

    What is the term used to describe the concept of providing alternative paths for data transmission in case of a failure?

    <p>Fault tolerance</p> Signup and view all the answers

    What is the primary function of the devices in the core layer?

    <p>To interconnect multiple blocks</p> Signup and view all the answers

    What is the term used to describe the layer that consists of devices one, two, A, and B?

    <p>Access Layer</p> Signup and view all the answers

    Why are hosts in a data center likely to have two network adapters?

    <p>To provide fault tolerance</p> Signup and view all the answers

    What is the primary goal of storage networks in terms of access to storage devices?

    <p>To provide high speed access for servers and computing resources</p> Signup and view all the answers

    What is the characteristic of wide area networks (WANs) in terms of geography?

    <p>They span multiple geographic locations, often across a country or region</p> Signup and view all the answers

    What is the purpose of IPsec and tunneling in wide area networks?

    <p>To build logical overlays for secure data transmission</p> Signup and view all the answers

    What is the role of software defined networking (SDN) in network architectures?

    <p>To allow computer programs to define network configurations and behavior</p> Signup and view all the answers

    What is the primary focus of the next video in the series, according to the speaker?

    <p>The three-tier architecture and its design principles</p> Signup and view all the answers

    What is the key benefit of using software defined networking in network architectures?

    <p>Greater flexibility and automation through programmable configurations</p> Signup and view all the answers

    What is the relationship between the underlay and logical overlays in wide area networks?

    <p>The underlay is a physical connection, and the logical overlay is built on top of it</p> Signup and view all the answers

    What is the common thread among the four network architectures discussed?

    <p>They can all be implemented using software defined networking</p> Signup and view all the answers

    What is the term used to describe the switches in the leaf layer of a two-tier hierarchy in a data center?

    <p>Top of Rack (TOR) switches</p> Signup and view all the answers

    What is the primary reason for having multiple TOR switches in a rack in a data center?

    <p>To provide redundancy and fault tolerance</p> Signup and view all the answers

    What is the term used to describe the layer in a two-tier hierarchy that connects to the leaf layer switches?

    <p>Backbone layer</p> Signup and view all the answers

    What is the key characteristic of a two-tier hierarchy in a data center?

    <p>No horizontal connectivity between devices at the same layer</p> Signup and view all the answers

    What is the primary difference between a two-tier hierarchy and a three-tier hierarchy?

    <p>Horizontal connectivity between devices at the same layer</p> Signup and view all the answers

    What type of network architecture is typically used in a campus environment?

    <p>Three-tier hierarchy</p> Signup and view all the answers

    What is the term used to describe the traffic flowing between the leaf layer and the spine layer in a two-tier hierarchy?

    <p>North-South traffic</p> Signup and view all the answers

    What is the purpose of a storage network?

    <p>To connect storage devices to the network</p> Signup and view all the answers

    What is the term used to describe the architecture of a two-tier hierarchy in a data center?

    <p>Spine-leaf architecture</p> Signup and view all the answers

    What is the main difference between a TOR switch and a spine switch?

    <p>TOR switches are used in the leaf layer, while spine switches are used in the backbone layer</p> Signup and view all the answers

    Study Notes

    Network Architecture Types

    • There are four specific network architecture types: three-tier architecture, two-tier architecture, storage network, and wide area network.

    Three-Tier Architecture

    • The three-tier architecture is composed of three layers: access layer, distribution layer, and core layer.
    • The access layer is where devices connect to the network.
    • The distribution layer is where multiple access layers are connected together.
    • The core layer is responsible for interconnecting multiple distribution layers.
    • This architecture is often used in large enterprise environments with end users.
    • It provides high speed connectivity between devices and fault tolerance.

    Two-Tier Architecture

    • The two-tier architecture is composed of two layers: leaf layer and spine layer.
    • The leaf layer is where hosts (e.g., servers) connect to switches (also known as top of rack switches).
    • The spine layer is where multiple leaf layers are connected together.
    • This architecture is often used in data center environments.
    • It provides high speed connectivity and fault tolerance.

    Storage Network

    • A storage network is a specific type of network architecture designed for high-speed access from servers to storage devices.
    • It uses specific protocols and options for storage networking.
    • Storage networks will be explored in more detail in a separate video.

    Wide Area Network

    • A wide area network (WAN) is a type of network architecture that connects devices over a large geographical area (e.g., across a country).
    • WANs use underlay (physical connections) and overlay (logical connections) technologies.
    • WANs often use IPsec and tunneling to secure connections.
    • Software defined networking (SDN) can be used to manage WANs.

    Additional Concepts

    • Fault tolerance refers to the ability of a network to continue functioning even if one or more devices fail.
    • Cross-connectivity refers to the connections between devices at the same layer in a network architecture.
    • East-West traffic and North-South traffic will be explored in more detail in a separate video.

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    Description

    Learn about the concept of 3-tier architecture in network building, where devices are connected as building blocks. This video serves as an introduction to different network architecture types.

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