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Which layer of OSI reference model is responsible for 'Encryption & Decryption' and 'Compression & Decompression'?
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Posted Date :
January 30, 2010
Presentation layer of OSI model is responsible for 'Encryption & Decryption' and 'Compression & Decompression' for data security.
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Which layer of OSI reference model is responsible for ''Encryption & Decryption'' and ''Compression & Decompression''?
How session layer in OSI model is responsible for Synchronisation and recovery?
Session layer creates certain check points while transmitting volumes of data in a sequence. When there is a problem in the transmission in the middle of any bulk of data, transmission will take place from the check point where it was left. This function of Session layer is called Synchronisation and recovery.
What is OSI reference model?
OSI(Open System Interconnection) is a network communication standard developed by ISO.
Synchronisation and Recovery in OSI model happens in which layer?
Synchronisation and Recovery in OSI model happens in Session layer. Session layer is also responsible for Token Management.
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 .
ATM - Protocol Reference Model ?
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.
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 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 difference between encoding and encryption
The Main difference between encoding and encryption are the Key
Both are used for manipulating string
Encoding : Is the way to manipulating without any key. Means the character or number is replaced by one another using some method
Encryption : Is also a way to change Data with Key. Means to encrypt string you need to have key to encrypt and the same way using that key you can decrypt the encrypted string or data.
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.
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