20 Questions
What term is used to describe the port where a frame enters the device?
Ingress
What is the primary intelligence of a LAN switch based on?
Ingress port and destination MAC address
How does a LAN switch forward traffic?
Based on the ingress port and destination MAC address
What type of table does a LAN switch maintain?
MAC address table
What are switches made up of?
Integrated circuits and accompanying software
What type of memory is used to store the MAC address table in a switch?
Content addressable memory (CAM)
How does a switch populate its MAC address table?
By recording the source MAC address of each device connected to each port
What does a switch do if the destination MAC address is not in its MAC address table?
It forwards the frame out of all ports except the incoming port
What happens if the source MAC address exists in the MAC address table but on a different port?
The switch treats this as a new entry and replaces it with the more current port number
What does the switch do when examining the destination MAC address if it is a unicast address?
It looks for a match in its MAC address table and forwards the frame out of the specified port
What is the purpose of the MAC address table stored in content addressable memory (CAM) in a switch?
To maintain a record of the source MAC addresses and their corresponding port numbers
What term is used to describe the port that frames will use when leaving the device?
Egress
What happens if a new frame enters a switch with a source MAC address that already exists in the MAC address table, but on a different port?
The entry for that MAC address is updated with the new port number
What is the primary intelligence of a LAN switch based on?
Forwarding table complexity
What happens if the destination MAC address of an incoming frame is not in the MAC address table of the switch?
The switch forwards the frame out of all ports except the incoming port
Which term describes the process of examining the source MAC address of an incoming frame to update or add an entry in the MAC address table?
MAC learning
What does a LAN switch use to direct network communications through the switch?
Destination MAC addresses
What does a switch do when examining the destination MAC address if it is a unicast address and not found in its MAC address table?
The switch forwards the frame out of all ports except the incoming port
How does a LAN switch forward traffic?
Based on the ingress port and destination MAC address
What type of memory is used to store the MAC address table in a switch?
RAM
Test your knowledge of networking switches and the forwarding of frames in LANs, WANs, and PSTN. Explore concepts like Ingress and Egress ports and the decision-making process for traffic flow.
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