Free CompTIA Network+ N10-009 Practice Question

SIP can use both TCP and UDP depending on the implementation requirements. TCP is typically used for scenarios that require guaranteed delivery of SIP messages when reliability is more important than speed. However, UDP is commonly used for SIP because it reduces the overhead and delay in communications, which is critical for real-time voice and video services. UDP's connectionless nature allows for quicker delivery, albeit without the delivery guarantees that TCP provides.