Which of the following tools implements a portable framework in tcpdump for capturing low-level network traffics in UNIX like networks?

SysPcap is not a real packet capture library or framework - it does not exist as a standard networking tool.

libpcap (Library for Packet Capture) is an open-source, portable C library that provides a system-independent API for capturing network packets at a low level. It is the underlying framework that tcpdump uses on UNIX and Linux systems to access raw network traffic, making it the direct answer to the question.

BinPcap is a fabricated name and does not correspond to any real packet capture library or framework.

WinPcap is the Windows port of the pcap library and is used on Windows systems, not UNIX-like environments, making it incorrect for this context.