Which of the following statements are true. A) The network access features of op

Question

Which of the following statements are true.

A) The network access features of operating systems are typically implemented following some variation of the Open Systems Interconnection (OSI) 7-layer model.

B) An abstraction layer or abstraction level is a way of hiding the implementation details of a particular set of functionality to allow separation of concerns to facilitate interoperability and platform independence

C) "All problems in computer science can be solved by another level of abstraction ... except for the problem of too many layers of abstraction."

D) Encapsulation is a method of designing modular communication protocols in which logically separate functions in the network are abstracted from their underlying structures by inclusion or information hiding within higher level objects. Using encapsulation, each layer of abstraction adds a header (and sometimes trailer) to the layer above. For example, in the Internet protocol suite, the contents of a web page are encapsulated with an HTTP header, then by a TCP header, an IP header, and, finally, by a frame header and trailer. The result of encapsulation is that each lower layer provides a service to the layer or layers above it.

E) In telecommunications and computer networks, multiplexing is a method by which multiple analog or digital signals are combined into one signal over a shared medium e.g. several telephone calls may be carried using one wire and data packets from many senders may be sequentially transmitted over a shared wire or radio frequency.

1. B, C, D

2. C, D, E

3. A, B, C, D, E

4. A, B, C

5. A, C, E

Explanation / Answer

A) The network access features of operating systems are typically implemented following some variation of the Open Systems Interconnection (OSI) 7-layer model.

TRUE

B) An abstraction layer or abstraction level is a way of hiding the implementation details of a particular set of functionality to allow separation of concerns to facilitate interoperability and platform independence

TRUE

C) "All problems in computer science can be solved by another level of abstraction ... except for the problem of too many layers of abstraction."

TRUE

D) Encapsulation is a method of designing modular communication protocols in which logically separate functions in the network are abstracted from their underlying structures by inclusion or information hiding within higher level objects. Using encapsulation, each layer of abstraction adds a header (and sometimes trailer) to the layer above. For example, in the Internet protocol suite, the contents of a web page are encapsulated with an HTTP header, then by a TCP header, an IP header, and, finally, by a frame header and trailer. The result of encapsulation is that each lower layer provides a service to the layer or layers above it.

TRUE

E) In telecommunications and computer networks, multiplexing is a method by which multiple analog or digital signals are combined into one signal over a shared medium e.g. several telephone calls may be carried using one wire and data packets from many senders may be sequentially transmitted over a shared wire or radio frequency.

TRUE

All the statements are true. Hence the answer is 3.

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