Which network layer protocols can Serial Line Internet Protocol use during a dial-up session?

Serial Line Internet Protocol (SLIP) is a simple protocol used to encapsulate Internet Protocol (IP) packets in a serial line, such as in dial-up connections. During a dial-up session, SLIP serves primarily to transfer IP datagrams over a serial connection between two points.

The correct selection recognizes that SLIP itself is a network layer protocol designed for this purpose. While IP is indeed the primary protocol that SLIP transmits, the question specifically asks about the protocols that SLIP can utilize, and its name denotes that it is directly related to this functionality.

TCP and UDP, on the other hand, are transport layer protocols that operate above the network layer. They are not utilized by SLIP directly for encapsulating data over a dial-up session. Instead, they depend on a functioning network layer protocol, such as IP, for their operation. Thus, while these transport layer protocols are essential for tasks like connection-oriented communication (TCP) or connectionless communication (UDP), they are not the protocols directly associated with SLIP itself.

In summary, the choice of SLIP as the correct answer is logical because it emphasizes the encapsulation of IP packets in the context of a dial-up session, directly outlining the purpose and functionality of