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.

Explanation
According to the Ethernet cable standards, Cat 6 UTP-based cabling can support 1 Gbps data rates up to 100 meters (328 feet) of cable length. This is the maximum recommended distance for a single cable run between a host and the switch where it is plugged in. If the cable length exceeds 100 meters, the signal quality may degrade and cause errors or lower performance. Cat 6 UTP-based cabling can also support 10 Gbps data rates up to 37-55 meters (121-180 feet), depending on the alien crosstalk atmosphere. However, for 10 Gbps data rates, Cat 6a UTP-based cabling is preferred, as it can support the full 100 meters of cable length. References
https://networkengineering.stackexchange.com/questions/81114/degradation-of-signal-quality-as-a-function-of-c
https://www.howtogeek.com/813419/how-long-can-an-ethernet-cable-be/