To fend off the rigidity of above issues, this
paper argues that a fundamental diversifying
attribute for the customized security experiences
of CMNs is pressing. So this paper focuses on
the flexibility and diversity of security of CMNs,
while the security technologies of CMNs are
not discussed here. In detail, this paper proposes
a programmable network structure based on
network function combination (NFC) in the
software defined network (SDN) [8], [9]. The
structure (which is named service processing
chain, SPC for short) is established by the ordinal
combination of network functions in substrate
switches dynamically, and therefore constructs
a special channel for each CMN with required
security services. Here, the network functions