1.2 Network Devices & Functions

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Last updated 6:56 PM on 3/25/26
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19 Terms

1
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Switch

  • Forwards traffic based on data link address

  • OSI Layer 2 device

2
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Router

  • Routes traffic between IP subnets

  • OSI Layer 3 device

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Firewall

  • Filters and encrypts traffic to protect the data and the network
  • Most firewalls also function as a router
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IDS

  • Intrusion Detection System
  • Watches network traffic for any malicious data or attacks
  • Detection - Alarm or alert
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IPS

  • Intrusion Prevention System
  • Watches network traffic for any malicious data or attacks
  • Prevention - Stops it before it gets into the network
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Load Balancer

  • Distributes network activity across multiple servers
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TCP Offloading

  • Load balancing method
  • Allows devices to connect to the server as quickly as possible
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SSL Offloading

  • Load balancing method
  • Handles the encryption/decryption process so servers don't need to
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Caching

  • Load balancing method
  • Common requests are stored on the load balancer so they are handled quickly
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Proxies

  • A server that sits between the user device and the outside network
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NAS

  • Network Attached Storage
  • Shared storage device across the network
  • File level access
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SAN

  • Storage Area Network
  • Shred storage device across the network
  • Block level access
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AP

  • Access Point
  • A bridge that allows devices to wirelessly connect to the local network
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Wireless LAN Controller

  • Centralized management of APs across a network
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CDN

  • Content Delivery Network
  • Geographically distributed caching servers
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VPN

  • Virtual Private Network
  • Secure private data traversing a public network
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Concentrator

  • A dedicated encryption/decryption device used to create the VPN
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QoS

  • Quality of Service
  • Configuration that controls the priority of different applications or services across a network
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TTL

  • Time To Live
  • A timer that ensures that a network process doesn't go on forever

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