When a switch receives a frame which three variables are used to build the CAM table? (Choose three.)

The correct answer is B. the source MAC address C. the destination MAC address D. the VLAN ID. The CAM (Content Addressable Memory) table, also called the MAC address table, maps MAC addresses within a VLAN to switch ports. When a switch receives a frame, it uses the source MAC address (B) to learn which port a device is connected to, stores it scoped to the VLAN ID (D)…

Cisco Data Center Networking Technologies

Question

Options

Athe outbound port
Bthe source MAC address
Cthe destination MAC address
Dthe VLAN ID
Ethe destination IP address
Fthe inbound port

How the community answered

(30 responses)

A
7% (2)
B
90% (27)
E
3% (1)

Explanation

The CAM (Content Addressable Memory) table, also called the MAC address table, maps MAC addresses within a VLAN to switch ports. When a switch receives a frame, it uses the source MAC address (B) to learn which port a device is connected to, stores it scoped to the VLAN ID (D) so MAC addresses remain logically isolated per VLAN, and references the destination MAC address (C) to look up the outgoing port and make a forwarding decision. Together, these three variables drive the process of populating and consulting the CAM table. The destination IP address (E) is a Layer 3 value irrelevant to Layer 2 switching. The outbound port (A) is a result of the lookup, not an input used to build the table.

Topics

#CAM table#MAC address learning#Layer 2 switching#VLAN

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