Network Segmentation

Question 1

LANs

Answer 1

• Local Area Networks

* A group of devices in the same broadcast domain

Question 2

Virtual LANs

Answer 2

• Virtual Local Area Networks
  
  • A group of devices in the same broadcast domain
  • Separated logically instead of physically

Question 3

802.1Q trunking

Answer 3

• Take a normal Ethernet frame
  
  • Add a VLAN header in the frame

• VLAN IDs - 12 bits long, 4,094 VLANs
• “Normal range” - 1 through 1005, “Extended range” -
1006 through 4094
• 0 and 4,095 are reserved VLAN numbers

• Before 802.1Q, there was ISL (Inter-Switch Link)
• ISL is no longer used; everyone now uses the
802.1Q standard