A security administrator must implement a network that is immune to ARP spoofing attacks. Which of the following should be implemented to ensure that a malicious insider will not be able to successfully use ARP spoofing techniques?
A. UDP B. IPv6 C. IPSec D. VPN
Answer: B
Explanation: ARP is not used in IPv6 networks. The Address Resolution Protocol (ARP) is a telecommunication protocol used for resolution of network layer addresses into link layer addresses, a critical function in multiple-access networks. ARP is used for converting a network address (e.g. an IPv4 address) to a physical address like an Ethernet address (also named a MAC address). In Internet Protocol Version 6 (IPv6) networks, the functionality of ARP is provided by the Neighbor Discovery Protocol (NDP).