Type of IP SLA: icmp_echo: measures Round Trip Time(RTT) between source and responder using ICMP . udp_echo: measures one way or RTT latency between the source and the responder using UDP. tcp_connect: measures the time that it takes to perform TCP Connect operation between the source and the responder. udp_jitter_voip: measures packet loss, one way delay, RTT, Mean Opinion Scores (MOS), (Impairment) Calculated Planning Impairment Factor (ICPIF) between the source and the responder using VOIP traffic. http: measures HTTP or HTTPS response time for a web page. This includes the time taken for DNS resolution, TCP connect, SSL handshake(for HTTPS) and fetching of the web page. 'dns': measures the time taken for DNS resolution for the given hostname and nameserver. 'dhcp': measures the time taken to perform DHCP operation on the given source interface.