Switch Interface Properties

Question 1

Basic Interface Configuration

Answer 1

• Speed and duplex
  
  • Speed: 10 / 100 /1,000
  • 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)

Question 2

VLANs

Answer 2

• VLAN assignment
  
  • Each device port should be assigned a VLAN

• Trunking
• Connecting switches together - Multiple VLANs in a
single link

• Tagged and untagged VLANs
  
  • 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

Question 3

DMZ

Answer 3

• Demilitarized zone
• An additional layer of security between the Internet
and you

Question 4

Powering devices

Answer 4

• Power provided on an Ethernet cable
  
  • One wire for both network and electricity
  • Phones, cameras, wireless access points
• Power provided at the switch
  
  • Built-in power - Endspans
  • In-line power injector - Midspans
• Power modes
  
  • Mode A - Power on the data pairs
  • Mode B - Power on the spare pairs

Question 5

PoE and POE+

Answer 5

• 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

Question 6

Port mirroring

Answer 6

• Examine a copy of the traffic
  
  • Port mirror (SPAN), network tap

• No way to block (prevent) traffic