Question 1

What action does a switch take when it receives a frame destined for a MAC address NOT in its MAC address table?

Accepted Answer

The switch floods the frame out all ports except the port it was received on. This is called unknown unicast flooding.

Question 2

How does a switch populate its MAC address table?

Accepted Answer

The switch learns source MAC addresses from incoming frames and maps them to the port on which they arrived. This is called dynamic learning.

Question 3

What is the default aging time for dynamic MAC address entries on a Cisco switch?

Accepted Answer

The default aging time is 300 seconds (5 minutes). If no frame is received from a MAC address within this period, the entry is removed.

Question 4

What is the difference between a collision domain and a broadcast domain on a switch?

Accepted Answer

Each switch port is its own collision domain, eliminating collisions between ports. By default, all ports on a switch belong to the same broadcast domain (VLAN 1).

Question 5

What switching method does a Cisco Catalyst switch use by default, and what does it check before forwarding a frame?

Accepted Answer

Cisco switches use store-and-forward switching by default. The switch receives the entire frame, checks the FCS for errors, and only then forwards the frame.

CCNA Switching & VLANs

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