Exam 350-401 topic 1 question 261 discussion

Some additional information: Reference: https://www.curtisswrightds.com/news/blog/enhancing-network-security-with-macsec.html MACsec vs IPsec – What’s the Difference? MACsec is for authentication and encryption of traffic over Ethernet on Layer 2 LAN networks. Alternatively, for Layer 3 networks, IPSec is used. Since MACsec and IPsec operate on different network layers, IPsec works on IP packets at Layer 3, while MACsec operates on Ethernet frames at Layer 2. Thus, MACsec can protect all Dynamic Host Configuration Protocol (DHCP) and Address Resolution Protocol (ARP) traffic, which IPsec cannot secure. On the other hand, IPsec can work across the wide area network (WAN) for routers, while MACsec is limited to switches or end-nodes on a LAN.

C is correct

macsec as it works at layer 2

MACsec: Layer 2 encryption protocols like the IEEE 802.1AE Media Access Control Security (MACsec) standard must register with the eEdge session manager to receive disconnect notifications and perform cleanup.