Cloud　computing　on-demand　dynamicity　in　nature　of　end-user　that　leads　towards　a　hybrid　cloud　model　deployment　is　called　a　multi-cloud.　Multi-cloud　is　a　multi-tenant　and　multi-vendor　heterogeneous　cloud　platform　in　terms　of　services　and　security　under　a　defined　SLA　(service　level　agreement).　The　diverse　deployment　of　the　multi-cloud　model　leads　to　rise　in　security　risks.　In　this　paper,　we　define　a　multi-cloud　model　with　hybridization　of　vendor　and　security　to　increase　the　end-user　experience.　The　proposed　model　has　a　heterogeneous　cloud　paradigm　with　a　combination　of　firewall　tracts　to　overcome　rising　security　issues.　The　proposed　work　consists　of　three　steps,　firstly,　all　incoming　traffic　from　the　consumer　end　into　five　major　groups　called　ambient.　Secondly,　design　a　next-generation　firewall　(NGFW)　topology　with　a　mixture　of　tree-based　and　demilitarized　zone　(DMZ)　implications.　Test　implementation　of　designed　topology　performed　by　using　a　simple　DMZ　technique　in　case　of　vendor-specific　model　and　NGFW　on　hybrid　vendor　based　multi-cloud　model.　Furthermore,　it　also　defines　some　advantages　of　NGFW　to　overcome　these　concerns.　The　proposed　work　is　helpful　for　the　new　consumer　to　define　their　dynamic　secure　cloud　services　under　a　single　SLA　before　adopting　a　multi-cloud　platform.　Finally,　results　are　compared　in　terms　of　throughput　and　CPU　utilization　in　both　cases.