  This article reveals an adequate comprehension of basic defense, security
challenges, 2 and attack vectors in deploying multi-network slicing. Network
slicing is a revolutionary concept 3 of providing mobile network on-demand and
expanding mobile networking business and services 4 to a new era. The new
business paradigm and service opportunities are encouraging vertical 5
industries to join and develop their own mobile network capabilities for
enhanced performances 6 that are coherent with their applications. However, a
number of security concerns are also raised 7 in this new era. In this article,
we focus on the deployment of multi-network slicing with multi8 tenancy. We
identify the security concerns, and discuss about the defense approaches such
as 9 network slice isolation and insulation in a multi-layer network slicing
security model. Also, we 10 identify the importance to appropriately select the
network slice isolation points, and propose 11 a generic framework to optimize
the isolation policy regarding the implementation cost while 12 guaranteeing
the security and performance requirements.
