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ATM - Protocol Reference Model ?
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Posted Date :
March 31, 2010
ATM protocol reference model describes the functions of different types of layers and organizational units that act on data when it is transmitted using ATM technology.
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ATM - Protocol Reference Model ?
What is OSI reference model?
OSI(Open System Interconnection) is a network communication standard developed by ISO.
Which layer of OSI reference model is responsible for 'Encryption & Decryption' and 'Compression & Decompression'?
Presentation layer of OSI model is responsible for 'Encryption & Decryption' and 'Compression & Decompression' for data security.
IEEE 802.3 Logical relationship with OSI Reference Model?
1. IEEE 802.3 physical layer corresponds to the OSI physical layer.
2. OSI data link layer is divided into two IEEE 802 sublayers .
(A). The Media Access Control (MAC) sublayer .
(B). The MAC-client sublayer .
What are the major data structures used in RDBMS, Network data model & Hierarchical data model.
RDBMS - Array (i.e. Array of structures)
Network data model - Graph
Hierarchical data model - Trees
What is a protocol class?
An abstract class is a protocol class if:
. it neither contains nor inherits from classes that contain member data, non-virtual functions, or private (or protected) members of any kind.
. it has a non-inline virtual destructor defined with an empty implementation,
. all member functions other than the destructor including inherited functions, are declared pure virtual functions and left undefined.
What is Data Model?
A collection of conceptual tools for describing data, data relationships data semantics and constraints.
What is E-R model?
This data model is based on real world that consists of basic objects called entities and of relationship among these objects. Entities are described in a database by a set of attributes.
What is Object Oriented model?
This model is based on collection of objects. An object contains values stored in instance variables with in the object. An object also contains bodies of code that operate on the object. These bodies of code are called methods. Objects that contain same types of values and the same methods are grouped together into classes.
what are value types and reference types?
Value type - bool, byte, chat, decimal, double, enum , float, int, long, sbyte, short, strut, uint, ulong, ushort
Value types are stored in the Stack
Reference type - class, delegate, interface, object, string
Reference types are stored in the Heap
What is the Transport Protocol you use to call a Web Service ?
SOAP (Simple Object Access Protocol) is the preferred protocol.
What are Value types and Reference types?
Value types directly contain their data which are either allocated on the stack or allocated in-line in a structure. Reference types store a reference to the value's memory address, and are allocated on the heap. Reference types can be self-describing types, pointer types, or interface types. Variables that are value types each have their own copy of the data, and therefore operations on one variable do not affect other variables. Variables that are reference types can refer to the same object; therefore, operations on one variable can affect the same object referred to by another variable. All types derive from the System.Object base type.
What is Reference counting in COM ?
Reference counting is a memory management technique used to count how many times an object has a pointer referring to it. The first time it is created, the reference count is set to one. When the last reference to the object is nulled, the reference count is set to zero and the object is deleted. Care must be exercised to prevent a context switch from changing the reference count at the time of deletion. In the methods that follow, the syntax is shortened to keep the scope of the discussion brief and manageable.
How can you reference current thread of the method ?
"Thread.CurrentThread" refers to the current thread running in the method."CurrentThread" is a public static property.
How do I call a member method and pass a primitive type (Value Type) by reference?
Use the ref keyword when declaring the parameter of the method, for example:
public bool GetValue( ref int returnValue );
This will pass the numeric by reference.You can modify the value of returnValue within the body of GetValue and it will persist when the method call returns.
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