TAILIEUCHUNG - Fiber Optics Illustrated Dictionary - Part 97

The Fiber Optics Illustrated Dictionary - Part 97 fills a gap in the literature by providing instructors, hobbyists, and top-level engineers with an accessible, current reference. From the author of the best-selling Telecommunications Illustrated Dictionary, this comprehensive reference includes fundamental physics, basic technical information for fiber splicing, installation, maintenance, and repair, and follow-up information for communications and other professionals using fiber optic components. Well-balanced, well-researched, and extensively cross-referenced, it also includes hundreds of photographs, charts, and diagrams that clarify the more complex ideas and put simpler ideas into their applications context | Fiber Optics Illustrated Dictionary Type of Service ToS. Type of Service is both a generic concept in networking and a specific parameter related to Internet Protocol communications. It describes and determines various networking parameters related to speed security format etc. As with many types of network services there may be tradeoffs between speed flexibility and security depending upon how ToS is specified at any particular lime or on specific types of networks. ToS is now mandated by the Requirements for Internet Hosts specifications described in the various relevant Requests for Comments RFC documents. At the present time support for ToS is somewhat uneven and there are known problems on some prevalent systems. In Internet Protocol IP a byte in the IP header supports Type of Service information. The byte is divided into the precedence field the TOS field and a reserved bit only one of which may be set at a time. It is recommended that routers be cognizant of the ToS value for a route in the routing table. If the routing protocol does not support ToS header settings the ToS must be assigned the default value of zero 0 . Physical Link Security Type of Service was described as an RFC by D. Eastlake in May 1993. It was submitted as an experimental protocol providing a ToS to request maximum physical link security in addition to existing types of services in the Internet Protocol IP Suite. This ToS requests protection against surreptitious observation by agents labeled as outside the traffic. When transporting SNA network traffic over TCP IP networks there are issues with preserving the SNA Class of Service CoS parameters. Cisco addressed this issue by developing a data-link switching enhancement DLSw to improve response time and the effective use of bandwidth while supporting SNA Type of Service ToS over TCP IP to ensure preservation of SNA CoS traffic parameters and aid networks in prioritizing SNA traffic. Programmers have created tables and software .

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