Explanation
The table that clients must populate to remember the L2 addressing of their neighbors is the ARP table. ARP stands for Address Resolution Protocol, which is a protocol that maps an IP address to a MAC address1. A MAC address is a unique identifier for a network interface card (NIC) that operates at the data link layer (layer two) of the OSI model2. An IPaddress is a logical identifier for a device that operates at the network layer (layer three) of the OSI model3. When a client wants to communicate with another device on the same network, it needs to know the MAC address of the destination device. To do this, the client sends an ARP request, which is a broadcast message that asks "Who has this IP address?" The device that has the matching IP address replies with an ARP reply, which contains its MAC address. The client then stores this information in its ARP table, which is a cache of IP-to-MAC mappings. Therefore, statement B is correct. Statements A, C, and D are incorrect because they describe different types of tables. A MAC table is a table that a switch uses to store MAC addresses and the corresponding ports that they are connected to. A routing table is a table that a router uses to store the destination networks and the next-hop addresses that they are reachable through. An ethernet table is not a valid term in networking. References: 1: Aruba Certified Network Technician (ACNT) Study Guide, page 342: Aruba Certified Network Technician (ACNT) Study Guide, page 283: Aruba Certified Network Technician (ACNT) Study Guide, page 29. : Aruba Certified Network Technician (ACNT) Study Guide, page 35. : Aruba Certified Network Technician (ACNT) Study Guide, page 30. : Aruba Certified Network Technician (ACNT) Study Guide, page 31.