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Naming. Chapter 4. Naming Entities. A name is a character string used to refer to an entity. An entity can be practically anything, mailboxes, newsgroups, web pages… To operate on an entity we need to access it via the entity “ access point ” Entities can have more than one access point.
Naming. Naming. Access point & address Location independent naming Identifier It refers to at most one entity Each entity has at most one id An id always refers to the same entity Name-to-address binding Name resolution vs message routing Flat naming Broadcasting and multicasting.
Naming. Chapter 4. Naming. Names are used to share resources, to uniquely identify entities, or to refer to locations. Name resolution is used for a process to access the named entity. Three issues are covered in this chapter:
Naming. Jennifer Rexford Advanced Computer Networks http://www.cs.princeton.edu/courses/archive/fall08/cos561/ Tuesdays/Thursdays 1:30pm-2:50pm. Goals of Today’s Lecture. Names in the Internet Domain Name System (DNS) DNS server hierarchy DNS queries and responses DNS caching
Naming. General. Highly important Understandability without delving into details Classes – Nouns File Account SymbolTable Methods – Verbs open() withdraw() lookup(). General (Cont.). Popularity Scope Rule of thumb: No good name -> Redesign the class
Naming. Chapter 4. Why Naming?. Names are needed to Identify entities Share resources Refer to locations, etc. It is necessary to resolve names What does human-friendly name correspond to Need a naming system In distributed systems, naming system itself is often distributed.
Naming. CSCI 6900/4900. Mounting. Mounting – Merging different namespaces transparently File system example Directory node of one namespace stores identifier of directory node of another namespace Mount Point – Directory node storing the foreign ID
Naming. March 8, 2001. Networks. What is naming? Associations between some elements in a set of names and some elements in a set of values Binding - One such association Name resolution - Determining the value associated with a name Context - A set of name to value associations
Naming. Molecular Compounds & Acids. Molecules. Molecule – two or more atoms covalently bound together Diatomic molecule – two of the same atom bound together. Diatomic Elements. H, N, O, F, Cl, Br, I or the Magnificent 7 H ave N o F ear O f I ce C old B everages