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: "peer to peer communication across network address translators"
  Abstract: Network Address Translation (NAT) causes well-known difficulties for peer-to-peer (P2P) communication, since the peers involved may not be reachable at any globally valid IP address. Several NAT traversal techniques are known, but their documentation is slim, and data about their robustness or relative merits is slimmer. This paper documents and analyzes one of the simplest but most robust and practical NAT traversal techniques, commonly known as "hole punching." Hole punching is moderately well-understood for UDP communication, but we show how it can be reliably used to set up peer-to-peer TCP streams as well. After gathering data on the reliability of this technique on a wide variety of deployed NATs, we find that about 82% of the NATs tested support hole punching for UDP, and about 64% support hole punching for TCP streams. As NAT vendors become increasingly conscious of the needs of important P2P applications such as Voice over IP and online gaming protocols, support for hole punching is likely to increase in the future.

Connected through hyperedge HE-1 (induced by source paper "nfv based iot security for home networks using mud"):
  with members:
    - "machine learning ddos detection for consumer internet of things devices"
    - "n baiot network based detection of iot botnet attacks using deep autoencoders"
    - "iot sentinel demo automated device type identification for security enforcement in iot"

Connected through hyperedge HE-2 (induced by source paper "a multi perspective analysis of carrier grade nat deployment"):
  with members:
    - "beyond counting new perspectives on the active ipv4 address space"
    - "a primer on ipv4 scarcity"

Connected through hyperedge HE-3 (induced by source paper "virtual private overlays secure group commounication in nat constrained environments"):
  with members:
    - "on the design and implementation of structured p2p vpns"
    - "archer a community distributed computing infrastructure for computer architecture research and education"
    - "a symphony conducted by brunet"

Connected through hyperedge HE-4 (induced by source paper "flow splitting with fate sharing in a next generation transport services architecture"):
  with members:
    - "differentiated end to end internet services using a weighted proportional fair sharing tcp"

Connected through hyperedge HE-5 (induced by source paper "user relative names for globally connected personal devices"):
  with members:
    - "unmanaged internet protocol taming the edge network management crisis"

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)