200-150 Question #190: Real Exam Question with Answer & Explanation

The correct answer is B: Forwards the frame to port3. A switch forwards a frame out a specific port when the destination MAC address has a matching entry in its MAC address table.

Cisco Data Center Networking Technologies

Question

Refer to the exhibit. How does the switch process the Ethernet frame?

Exhibit

Options

Adrop the frame
BForwards the frame to port3
Cfilter the frame
Dfloods the frame

Explanation

A switch forwards a frame out a specific port when the destination MAC address has a matching entry in its MAC address table.

Common mistakes.

A. Switches only drop frames under specific conditions such as port security violations or VLAN mismatches, not when the destination MAC is known and valid.
C. Filtering occurs when the source and destination MAC are on the same port, preventing a loop, which is not the case when a learned destination entry exists in the table.
D. Flooding (unknown unicast) only happens when the destination MAC is absent from the MAC address table, not when a matching entry already exists.

Concept tested. Switch MAC address table unicast forwarding decision

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/lanswitch/configuration/xe-17/lanswitch-xe-17-book/lsw-mac-addr-tbl.html

Topics

#MAC table#frame forwarding#Layer 2 switching

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