Internet TCP port 49 is primarily used by the TACACS+ protocol, which stands for Terminal Access Controller Access-Control System Plus. This protocol is commonly used by network devices like routers and switches to provide centralized access control and auditing. Cisco's proprietary version of TACACS, known as XTACACS, also uses this port. Therefore, any software or system that implements TACACS+ or XTACACS, such as Cisco's networking equipment, will use TCP port 49.
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