Describe switching concepts
10 practice questions under this official exam objective (200-301) — each with the community-verified answer, a full option-by-option explanation and instant feedback.
What Is the Primary Effect of spanning-tree portfast?
PortFast (edge port) bypasses the listening and learning states so an end-host interface reaches forwarding without the normal 30-second STP delay. Th
What Is a Function of MAC Learning on a Switch?
MAC learning lets a switch dynamically build its MAC address table (CAM table) by reading the source MAC address of every received frame and associati
How MAC Learning Adds Source Addresses to the CAM Table
When a switch receives a frame, it reads the source MAC and records it with the receiving port/VLAN in the MAC address table (CAM table). Unknown sour
Switch Frame Forwarding: Flooding Unknown Unicast Destinations
When a switch receives a frame whose destination MAC is not in its MAC address table, it does not know the egress port. It forwards a copy out every p
How a Switch Handles an ARP Request for an Unknown Destination
An ARP request uses destination MAC ffff.ffff.ffff, a Layer 2 broadcast. A switch cannot route it; it floods broadcasts within the VLAN out all ports
How a Switch Performs Frame Switching
A Layer 2 switch forwards frames by looking up the destination MAC in the MAC address table (CAM table) to select the egress port. It does not rewrite
How MAC Address Learning Works on a Switch
A switch learns by inspecting the source MAC of every incoming frame and mapping it to the receiving port and VLAN in the MAC address table, with an a
How a Switch Performs Frame Switching
A Layer 2 switch forwards frames by looking up the destination MAC in the MAC address table (CAM table) to select the egress port. It does not rewrite
Switch Action on a Frame from an Unknown Source MAC
On receiving a frame, the switch always learns the source MAC by binding it to the receiving port/VLAN in the MAC table. Flooding is the action for an
How MAC Address Learning Functions on a Switch
A switch learns by inspecting the source MAC of every incoming frame and mapping it to the receiving port/VLAN in the MAC address table, with an aging