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: "active internet traffic filtering real time response to denial of service attacks"
  Abstract: Denial of Service (DoS) attacks are one of the most challenging threats to Internet security. An attacker typically compromises a large number of vulnerable hosts and uses them to flood the victim's site with malicious traffic, clogging its tail circuit and interfering with normal traffic. At present, the network operator of a site under attack has no other resolution but to respond manually by inserting filters in the appropriate edge routers to drop attack traffic. However, as DoS attacks become increasingly sophisticated, manual filter propagation becomes unacceptably slow or even infeasible. #R##N#In this paper, we present Active Internet Traffic Filtering, a new automatic filter propagation protocol. We argue that this system provides a guaranteed, significant level of protection against DoS attacks in exchange for a reasonable, bounded amount of router resources. We also argue that the proposed system cannot be abused by a malicious node to interfere with normal Internet operation. Finally, we argue that it retains its efficiency in the face of continued Internet growth.

Connected through hyperedge HE-1 (induced by source paper "anonymizing masses practical light weight anonymity at the network level"):
  with members:
    - "taranet traffic analysis resistant anonymity at the network layer"
    - "a multi perspective analysis of carrier grade nat deployment"
    - "beyond counting new perspectives on the active ipv4 address space"
    - "hornet high speed onion routing at the network layer"
    - "dovetail stronger anonymity in next generation internet routing"
    - "netfence preventing internet denial of service from inside out"

Connected through hyperedge HE-2 (induced by source paper "umbrella enabling isps to offer readily deployable and privacy preserving ddos prevention services"):
  with members:
    - "middlepolice fine grained endpoint driven in network traffic control for proactive ddos attack mitigation"
    - "mirage towards deployable ddos defense for web applications"
    - "netfence preventing internet denial of service from inside out"

Connected through hyperedge HE-3 (induced by source paper "practical verifiable in network filtering for ddos defense"):
  with members:
    - "snort intrusion detection system with intel software guard extension intel sgx"
    - "lightbox full stack protected stateful middlebox at lightning speed"

Connected through hyperedge HE-4 (induced by source paper "patterns and interactions in network security"):
  with members:
    - "oblivious dns practical privacy for dns queries"

Connected through hyperedge HE-5 (induced by source paper "middlepolice fine grained endpoint driven in network traffic control for proactive ddos attack mitigation"):
  with members:
    - "mirage towards deployable ddos defense for web applications"
    - "netfence preventing internet denial of service from inside out"
    - "as relationships inference and validation"

Connected through hyperedge HE-6 (induced by source paper "fair forwarding accountability for internet reputability"):
  with members:
    - "scion five years later revisiting scalability control and isolation on next generation networks"
    - "netfence preventing internet denial of service from inside out"

Connected through hyperedge HE-7 (induced by source paper "mirage towards deployable ddos defense for web applications"):
  with members:
    - "netfence preventing internet denial of service from inside out"

Connected through hyperedge HE-8 (induced by source paper "attrition defenses for a peer to peer digital preservation system"):
  with members:
    - "preserving peer replicas by rate limited sampled voting"
    - "narses a scalable flow based network simulator"

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)