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Clostridium botulinum
 A Rapidly Reconfigurable, Application Layer, Virtual Environment Network Protocol $25.95 This is a NAVAL POSTGRADUATE SCHOOL MONTEREY CA report procured by the Pentagon and made available for public release. It has been reproduced in the best form available to the Pentagon. It is not spiral-bound, but rather assembled with Velobinding in a soft, white linen cover. The Storming Media report number is A739213. The abstract provided by the Pentagon follows: The current Distributed Interactive Simulations (DIS) Protocol has a limited ability to support real time, simulated engagements of more than 1000 entities because of its excessive use of network resources. It also lacks the extensibility to add new protocol data units to support new simulation requirements. To solve these problems it is necessary to design an implement a rapidly reconfigurable network protocol that can be easily changed and distributed to all entities in a large scale simulation. This protocol must be highly flexible and allow for the optimization of data content during execution. The approach used was to design and build a rapidly reconfigurable network protocol and the tools necessary to use it. This was accomplished in four phases. First, a protocol using the concepts of Self-defined Messages with Multiple Presentations was developed. Second, a formal grammar to describe the protocol was designed. Third, an existing protocol development tool, the DIS protocol Support Utility, was modified to use the new protocol and grammar. Fourth, the protocol was tested to determine its effect on network resource utilization. As a result of this effort, a network protocol for distributed simulations that can be optimized at run-time and easily modified has been developed. Testing shows that the protocol can reduce the network bandwidth necessary for a large-scal distributed simulation by up to 70%. Framework for a Link Layer Packet Filtering (LLPF) Security Protocol $48.95 This is a NAVAL POSTGRADUATE SCHOOL MONTEREY CA report procured by the Pentagon and made available for public release. It has been reproduced in the best form available to the Pentagon. It is not spiral-bound, but rather assembled with Velobinding in a soft, white linen cover. The Storming Media report number is A335553. The abstract provided by the Pentagon follows: Transport Layer (OSI Layer 3) switching and routing provides routing flexibility but not high throughput. Link layer (OSI Layer 2) switching provides high throughput but not the routing flexibility needed to manage topology change and load fluctuations in the network. Neither Layer 3 routing nor Layer 2 switching protocols were originally designed to support confidentiality and integrity of data, and authentication of participants. Proposals to integrate security may have positive results for data confidentiality, integrity and authentication, but often result in additional overhead, increased transmission latency, and decreased throughput. An added difficulty is reconciling standards and protocols when integrating heterogeneous routing networks with homogenous switching networks while minimizing impact on throughput. This thesis examined current Internet extensions and architectures as well as IP security services and Layer 2 switching in IP-based networks. Requirements for a framework for a proposed security protocol include: Link Layer switching and routing; independence of particular communication protocols and standards; IP packet filtering and routing according to predetermined security policies and with no significant impact on throughput; and continued routing flexibility of IP. This security protocol, called Link Layer (Link Layer Packet Filtering (LLPF)), filters packets at the Link Layer, and boasts two innovations: use of an authentication trailer and multiple cryptographic keys with short cryptoperiods. Solutions for Reliable Multicasting $36.95 This is a NAVAL POSTGRADUATE SCHOOL MONTEREY CA report procured by the Pentagon and made available for public release. It has been reproduced in the best form available to the Pentagon. It is not spiral-bound, but rather assembled with Velobinding in a soft, white linen cover. The Storming Media report number is A924913. The abstract provided by the Pentagon follows: Many of the applications that will be hosted on the Marine Corps' Tactical Data Network (TDN) require data to be delivered reliably from one sender to many receivers. Reliable multicast protocols are better suited for this one-to-many communication than conventional transport layer unicast protocols. These multicast protocols will have to contend with the limited bandwidth and high bit error rates of wide area links in the tactical internet. They must also adapt to the intemet's changing topology, and be robust enough to survive its inevitable disruptions. This thesis evaluates several reliable transport layer multicast protocols for their ability to deliver data reliably over a tactical intemet. Because multicast routing protocols build delivery trees for these protocols, they are also evaluated. The bandwidth saved by multicast protocols make them particularly valuable in the tactical internet. However, at both the network and transport layers, no single protocol satisfies all the requirements of the internet. Which protocols are selected for TDN depends on how the decision maker weights the requirements of the tactical internet. The types of tactical data systems will also influence the choice of a multicast routing protocol. Similarly, the reliable multicast protocols which are selected must meet the demands of the application for which they were designed while still operating within the constraints imposed by the tactical internet. |
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