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12 Cards in this Set

  • Front
  • Back

HUB

OSI Layer, Purpose

HUB




  • OSI Layer 1 Device (Physical)
  • Multiport repeaters acting on one collision domain. Good for diagnostics and nothing else
  • Should be upgraded to a switch if still in use

SWITCH

OSI Layer, Purpose

SWITCH




  • OSI Layer 2 Device (Data Link)
  • Store an in-memory MAC table and provide dedicated bandwidth to each port.
  • Unlike a repeater, each port is in a separate collision domain, minimizing traffic.

ROUTER

OSI Layer, Purpose

ROUTER



  • OSI Layer 3 Device (Network)
  • Separates entire networks.
  • Also allows communication between networks.

WAP

OSI Layer, Purpose

WIRELESS ACCESS POINT



  • OSI Layer 2 Device (Data Link)
  • Provides IEEE 802.11 (Wireless Ethernet) Connectivity

ETHERNET DOMAINS

How are domains separated?

ETHERNET DOMAINS




  • HUB - Shared collision domain
  • SWITCH - Separate collision domains
  • ROUTER - Separate collision domains residing in each broadcast domain

FIREWALL

Purpose

Selectively allow or block network traffic based on IP addresses and port numbers.

IDS, NIDS, HIDS

Purpose

INTRUSION DETECTION SYSTEM



  • Passive detection of network attacks
  • Also known as NIDS (Network-based Intrusion Detection System)
  • HIDS: Host-based Intrusion Detection System.
  • Signatures and Anomalies

PROXY/CONTENT FILTER

Purpose

PROXY/CONTENT FILTER



  • Acts on behalf of other devices
  • Content filter: Classifies websites and prevents or allows access according to content

ANALOG MODEM

Purpose

ANALOG MODEM



  • MOdulate/DEModulate
  • Still used on special purpose devices that do not need a higher speed (FAX Machines)

VPN CONCENTRATOR

Purpose

VPN CONCENTRATOR



  • Provides dedicated hardware circuitry to host virtual private network (VPN) connections
  • VPNs can run on server software, but are often heavy on system resources and a concentrator provides a more permanent solution.

LOAD BALANCER

Purpose

LOAD BALANCER



  • Distributes incoming traffic across multiple nodes
  • Provides HA (high availability)
  • Gives users a faster experience by not bogging down one node

PACKET SHAPER

Purpose

PACKET SHAPER



  • Makes sure that certain types of traffic always have appropriate level of bandwidth
  • Prioritizes network traffic based upon a user-defined set of rules