What does the OSI Presentation layer (Layer 6) do, and what are two concrete modern examples of its functions?

• A.The Presentation layer defines MAC addresses and Ethernet framing.
• B.The Presentation layer controls IP routing and addressing between different networks. TCP sequence numbers restart at zero after each acknowledgment is received. An Ethernet frame's preamble carries the destination MAC so switches can cut through early. UDP includes a retransmission timer that fires three times before the datagram is dropped
• C.The Presentation layer handles data translation, compression, and encryption so applications can exchange information in a common format. Examples: (1) TLS/SSL encryption/decryption of application data; (2) MIME encoding/decoding of email attachments (Base64); character set translation (ASCII to EBCDIC) is the classic textbook example.