function and enables selective traffic redirection based upon short lived classifiers. In this, signaled path is requested via pre- path computation element. The Service Engineered Path (SEP) concept was introduced as a very strong new means of service delivery for the Service Provider community-a Juniper-specific solution and many more, but one that solved the problem prior to any standardization of such a concept. (Albert Greenberg et.al, 2005) The main problem due to the SEP was that service providers were constrained in making new service offerings by the need to deploy the service appliances (or dedicated services blades) comprising of the service offerings which includes Intrusion Detection Systems (IDS), Intrusion Prevention Systems (IPS), firewall, load balancers, and SSL offloaders that were run within the edge routers that would serve their projected markets. Figure 8. Services Engineered Path Sensor N/W Content Delivery Value Added Trustable N/W Power Oriented Services Services Services Services N/W Services Vrtual N/W fr Vrtual N/W fr service A Vrtual N/W fr service A service A Service Programming Cache Compression Service Component Statistics Management Execution Data Replication Virtual N/W Service Location Integrated Authentication Information Management Encryption/ Metering Decryption Network Platform Downloaded: 4/15/2022 9:44:49 AM Nova Southeastern University IP Address: 137.52.76.29 Virtualizing Network Functions in Software-Defined Networks But this operation resulted service introduction as laborious and disruptive network functions. By this path, too many subscribers came into existence and hence, requiring the installation of more appliances/blades. Consequently, different motivations were required for SEP to optimally stitch the path of a subscriber service through multiple sites in a WAN and many more operations. These includes mainly: Network devices providing Service Enabling Technologies (SETs) would be transparent to the general network infrastructure. Upgradation to one or more serv