Lan devices
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LAN Devices. 5.3 IT Essentials. LAN Devices— Host. Provides users with connection to network computers (both clients and servers) printers scanners other user devices Connects directly to a network segment Operates at all 7 layers of the OSI model. LAN Devices— NIC.

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LAN Devices

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Lan devices

LAN Devices

5.3 IT Essentials


Lan devices host

LAN Devices—Host

  • Provides users with connection to network

    • computers (both clients and servers)

    • printers

    • scanners

    • other user devices

  • Connects directly to a network segment

  • Operates at all 7 layers of the OSI model


Lan devices nic

LAN Devices—NIC

  • Network interface card

  • Printed circuit board usually installed inside a computer case

  • Also called network adapter

  • Adapts host device to the network

  • Layer 2 device

  • Carries a unique code called a MAC address


Lan devices media

LAN Devices—Media

  • Carries a flow of information, in the form of bits and bytes, through a LAN

  • Considered layer 1 component

  • Includes

    • Cat 5 UTP

    • optical fiber

    • free space

    • coaxial cable


Lan devices repeater

LAN Devices—Repeater

  • Regenerates and retimes network signals

  • Allows signal to travel a longer distance on the media

  • Single-port “in” and single-port “out” device

  • Classified as layer 1 device


Lan devices hub

LAN Devices—Hub

  • Regenerates and retimes network signals

  • Also known as a multi-port repeater

  • Creates central connection point for wiring media

  • Classified as layer 1 device

  • Can be active or passive

  • Can be “intelligent” or “dumb”


Lan devices bridge

LAN Devices—Bridge

  • Connects two LAN segments to make one larger continuous LAN

  • Filters LAN traffic to keep local traffic local

  • Allows connectivity to other parts of the LAN

  • Simple to install and manage—costs less than router

  • Checks MAC address to make forwarding decisions

  • Considered layer 2 device


Lan devices switch

LAN Devices—Switch

  • Sometimes called a multi-port bridge

  • Switches data from incoming port to outgoing port

  • Forwards data only to the appropriate port for the intended recipient

  • Concentrates connectivity to make data transmission more efficient

  • Considered layer 2 device


Lan devices hosts hubs and switches

LAN Devices—Hosts, Hubs, and Switches


Lan devices router

LAN Devices—Router

  • Most important traffic-regulating device on a network

    • Examines incoming packets

    • Chooses the best path for them through the network

    • Switches them to the proper outgoing port

    • Bases forwarding decisions on network addresses

  • Considered layer 3 device

  • Provides Internet access

  • Interconnects multiple LANs


Wireless lan

Wireless LAN

  • Client with wireless NIC

    • NIC uses radio technology to transmit a signal through the air, instead of over a wire

  • Correctly deployed access point

    • Access point performs many of the same functions as simple hub

    • Access point sometimes acts as a bridge to a wired Ethernet network


Lan devices cloud

LAN Devices—Cloud

  • Suggests another network, perhaps the entire Internet

  • Represents a large group of devices that connect any one computer to a distant computer

  • A collection of devices that operate at all levels of the OSI model so is classified as a Layer 1-7 device


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