Lec-13: Switch, Hub & Bridge Explained - What's the difference?

Gate Smashers
5 Oct 202104:59

Summary

TLDRIn this video, the concept of a switch in networking is explained, highlighting its role as a multi-port bridge. Unlike a bridge, which connects two LANs, a switch connects multiple devices like computers, printers, and wireless devices. It operates at the data link layer and provides a full-duplex link, eliminating collisions by ensuring data flows in parallel. The switch uses physical addresses to direct messages efficiently, reducing traffic and collisions compared to a hub. While primarily a layer 2 device, switches can be upgraded to layer 3, incorporating routing capabilities. The video offers valuable insights for exams and interviews.

Takeaways

  • 😀 Switches are Layer 2 devices that operate at the Data Link Layer and Physical Layer in networking.
  • 😀 Unlike a bridge, which has only two ports, a switch is essentially a multi-port bridge, supporting more devices with multiple ports (e.g., 8, 24, 48, or 52 ports).
  • 😀 A switch allows you to connect various devices, such as computers, laptops, printers, and wireless devices, forming a network.
  • 😀 When connecting to the internet, devices connect to the switch first, which then links them to the router, facilitating access to the world wide web.
  • 😀 A switch provides full-duplex communication, meaning data can flow both ways simultaneously between devices without collisions.
  • 😀 The switch’s full-duplex feature eliminates data collisions, unlike a hub where multiple devices share the same channel and may collide.
  • 😀 Each device connected to a switch operates in its own circuit, ensuring that messages between devices (e.g., A to B, C to D) are separate and do not interfere.
  • 😀 A switch significantly reduces network traffic compared to a hub. It only sends messages to the intended recipient based on the destination address in its table, not broadcasting to all devices.
  • 😀 Since switches have minimal traffic and zero collisions, they are considered powerful and efficient networking devices.
  • 😀 Although switches are typically Layer 2 devices, they can be enhanced to Layer 3 (network layer) by upgrading them to smart switches, which perform some routing functions like a router.

Q & A

  • What is the main purpose of a switch in networking?

    -A switch is a networking device that connects multiple devices within a network, such as computers, laptops, and printers, allowing them to communicate with each other efficiently.

  • How is a switch different from a bridge?

    -Both a switch and a bridge are Layer 2 devices, but a switch is a multi-port bridge. A bridge typically has two ports to connect two LANs, whereas a switch has multiple ports to connect several devices.

  • What is meant by full-duplex communication in a switch?

    -Full-duplex communication means that data can be transmitted and received simultaneously on the same link without any collisions, allowing for efficient data flow between devices.

  • Why does a switch have zero collisions?

    -A switch creates separate communication circuits for each device pair. Since each device communicates on its own dedicated path, there are no collisions between data streams.

  • How does a switch reduce network traffic compared to a hub?

    -Unlike a hub, which broadcasts data to all connected devices, a switch uses MAC addresses to send data only to the intended recipient, reducing unnecessary traffic and improving network efficiency.

  • What are the potential number of ports a switch can have?

    -A switch can have various numbers of ports, such as 8, 24, 48, or even 52, depending on its model and the requirements of the network it is designed for.

  • What does it mean that a switch operates at Layer 2 of the OSI model?

    -Layer 2 refers to the Data Link layer in the OSI model, which is responsible for physical addressing (MAC addresses) and reliable data transfer between devices within a network.

  • Can switches function as Layer 3 devices? If so, how?

    -Yes, switches can be enhanced to operate as Layer 3 devices, known as smart switches. These switches gain additional routing functionality, which is typically associated with routers.

  • How does a switch help in connecting a device to the internet?

    -A switch connects devices like laptops to a router. The switch links multiple devices to the router, which in turn connects to the internet, allowing users to access the World Wide Web.

  • What is a collision domain, and why does a switch have zero collision domains?

    -A collision domain refers to a network segment where data packets can collide if multiple devices send data simultaneously. In a switch, each device has its own dedicated path, so there are no collisions, leading to zero collision domains.

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Transcripts

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Ähnliche Tags
NetworkingSwitchLayer 2Full DuplexCollision DomainInternet ConnectivityTech TutorialsCompetitive ExamsNetworking DevicesSmart SwitchesCollege Exams
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