Which of the following statement is true regarding ARP? a. ARP poisoning is a Man in the Middle style attack. b. ARP is a protocol used to resolve URLs to IP addresses. c. ARP authenticates proposed changes to its cache to prevent spoofing. d. Static ARP entries are an effective way to defend against ARP attacks in large networks. Which of the following statements are true regarding IPsec Security Associations? (Select all that apply.) a. The SPI value in the ESP Header tells the receiving endpoint which SA should be used to process the received packet. b. The Security Parameter Index acts as a temporary key used to encrypt user traffic streams. c. Security Association attributes are negotiated between IPsec endpoints after the IKE is complete. d. Two endpoints can communicate bidirectionally once they establish a Security Association