Which entry correctly represents the first ACE of the GameConsoles MAC-based ACL (Destination MAC 00041F111111, Mask 000000111111)?

Which entry correctly represents the first ACE of the GameConsoles MAC-based ACL (Destination MAC 00041F111111, Mask 000000111111)?

• A. Destination MAC Address 005042111111, Mask 000000111111
• B. Destination MAC Address 00041F111111, Mask 000000111111
• C. Destination MAC Address 000D3A111111, Mask 000000111111
• D. Destination MAC Address 001315111111, Mask 000000111111

Answer: (B)

In a MAC-based ACL, an ACE matches a packet by comparing the destination MAC address with the address in the ACE, but only the bits indicated by the mask are actually used for the comparison. The mask 000000111111 means the last three octets (the final six hex digits) are the ones that matter; the first three octets are ignored for matching. The packet’s destination MAC is 00041F111111, so the most precise ACE to represent this match is the one that uses that exact destination MAC value with the same mask. That entry correctly captures the bits that are significant for matching, making it the proper first ACE.

In a MAC-based ACL, an ACE matches a packet by comparing the destination MAC address with the address in the ACE, but only the bits indicated by the mask are actually used for the comparison. The mask 000000111111 means the last three octets (the final six hex digits) are the ones that matter; the first three octets are ignored for matching. The packet’s destination MAC is 00041F111111, so the most precise ACE to represent this match is the one that uses that exact destination MAC value with the same mask. That entry correctly captures the bits that are significant for matching, making it the proper first ACE.