human: Given a node-centered hypergraph: <hypergraph>, where nodes represent papers and hyperedges represent sets of papers co-cited by a source paper.

Details of the hypergraph:
Center node: "oshi open source hybrid ip sdn networking and its emulation on mininet and on distributed sdn testbeds"
  Abstract: The introduction of SDN in IP backbones requires the coexistence of regular IP forwarding and SDN based forwarding. The former is typically applied to best effort Internet traffic, the latter can be used for different types of advanced services (VPNs, Virtual Leased Lines, Traffic Engineering...). In this paper we first introduce the architecture and the services of an "hybrid" IP/SDN networking scenario. Then we describe the design and implementation of an Open Source Hybrid IP/SDN (OSHI) node. It combines Quagga for OSPF routing and Open vSwitch for OpenFlow based switching on Linux. The availability of tools for experimental validation and performance evaluation of SDN solutions is fundamental for the evolution of SDN. We provide a set of open source tools that allow to facilitate the design of hybrid IP/SDN experimental networks, their deployment on Mininet or on distributed SDN research testbeds and their test. Finally, using the provided tools, we evaluate key performance aspects of the proposed solutions. The OSHI development and test environment is available in a VirtualBox VM image that can be downloaded.

Connected through hyperedge HE-1 (induced by source paper "segment routing a comprehensive survey of research activities standardization efforts and implementation results"):
  with members:
    - "srperf a performance evaluation framework for ipv6 segment routing"
    - "an efficient linux kernel implementation of service function chaining for legacy vnfs based on ipv6 segment routing"
    - "node constrained traffic engineering theory and applications"
    - "sdn architecture and southbound apis for ipv6 segment routing enabled wide area networks"
    - "flexible failure detection and fast reroute using ebpf and srv6"
    - "leveraging ebpf for programmable network functions with ipv6 segment routing"
    - "centrality based middlepoint selection for traffic engineering with segment routing"
    - "implementation of virtual network function chaining through segment routing in a linux based nfv infrastructure"

Connected through hyperedge HE-2 (induced by source paper "hybrid ip sdn networking open implementation and experiment management tools"):
  with members:
    - "traffic engineering with segment routing sdn based architectural design and open source implementation"
    - "software defined networking a comprehensive survey"

Connected through hyperedge HE-3 (induced by source paper "oshi open source hybrid ip sdn networking and mantoo management tools for sdn experiments"):
  with members:
    - "software defined networking a comprehensive survey"

Connected through hyperedge HE-4 (induced by source paper "software defined networking a comprehensive survey"):
  with members:
    - "splitarchitecture sdn for the carrier domain"
    - "split architecture for large scale wide area networks"
    - "tinynbi distilling an api from essential openflow abstractions"
    - "emerging technologies and research challenges for 5g wireless networks"
    - "distributed and collaborative traffic monitoring in software defined networks"
    - "controlling a software defined network via distributed controllers"
    - "streamon a data plane programming abstraction for software defined stream monitoring"
    - "research directions in network service chaining"

Question: Please tell me which class the center node belongs to. The 40 classes are: cs.NA(Numerical Analysis), cs.MM(Multimedia), cs.LO(Logic in Computer Science), cs.CY(Computers and Society), cs.CR(Cryptography and Security), cs.DC(Distributed, Parallel, and Cluster Computing), cs.HC(Human-Computer Interaction), cs.CE(Computational Engineering, Finance, and Science), cs.NI(Networking and Internet Architecture), cs.CC(Computational Complexity), cs.AI(Artificial Intelligence), cs.MA(Multiagent Systems), cs.GL(General Literature), cs.NE(Neural and Evolutionary Computing), cs.SC(Symbolic Computation), cs.AR(Hardware Architecture), cs.CV(Computer Vision and Pattern Recognition), cs.GR(Graphics), cs.ET(Emerging Technologies), cs.SY(Systems and Control), cs.CG(Computational Geometry), cs.OH(Other Computer Science), cs.PL(Programming Languages), cs.SE(Software Engineering), cs.LG(Machine Learning), cs.SD(Sound), cs.SI(Social and Information Networks), cs.RO(Robotics), cs.IT(Information Theory), cs.PF(Performance), cs.CL(Computation and Language), cs.IR(Information Retrieval), cs.MS(Mathematical Software), cs.FL(Formal Languages and Automata Theory), cs.DS(Data Structures and Algorithms), cs.OS(Operating Systems), cs.GT(Computer Science and Game Theory), cs.DB(Databases), cs.DL(Digital Libraries), cs.DM(Discrete Mathematics). Directly output the class name.

gpt: cs.NI(Networking and Internet Architecture)