Switch Interface Properties

Basic Interface Configuration
  • Speed and duplex
    • speed : 10/100/1000
    • Duplex : Half/Full
    • Automatic and manual
    • Needs to match on both sides
  • IP address management
    • Layer 3 interfaces
    • VLAN interfaces
    • Management interfaces
    • IP address, subnet mask/CIDR block, default gateway, DNS (optional)
VLANs
  • VLAN assignment
    • Each device port should be assigned a VLAN
  • Trunking
    • Connecting switches together - Multiple VLANs in a single link
  • Tagged and untagged VLAN
    • A non-tagged frame is on the default VLAN
      • Also called the native VLAN
    • Trunk ports will tag the outgoing frames
      • And remove the tag on incoming frames
DMZ
  • Demilitarized zone
    • An additional layer of security between the Internet and you
Powering devices
  • Power provided on an Ethernet cable
    • One wire for both network and electricity
    • Phones, cameras, wireless access points
  • Power provided at the switch
    • Build-in power - Endspans
    • In-line power injector - Midspans
  • Power modes
    • Mode A - Power on the data pairs
    • Mode B - Power on the spare pairs
PoE and POE+
  • PoE : IEEE 802.3af-2003
    • The original PoE specification
    • included in 802.3at
    • Now part of 802.3-2012
    • 15.4 watts DC power
    • Maximum current of 350 mA
  • POE+ : IEEE 802.3at-2009
    • The updated PoE specification
    • Now also part of 802.3-2012
    • 25.5 watts DC power
    • Maximum current of 600 mA
Port mirroring
  • Examine a copy of the traffic
    • Port mirror (SPAN), network tap
  • No way to block (prevent) traffic

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