Abstract Syntax Notation One (ASN.1) Questions & Answers

This set of Computer Network Management Multiple Choice Questions & Answers (MCQs) focuses on “Abstract Syntax Notation One (ASN.1)”.

1. In Network Management System, ASN.1 stands for_______
a) Autonomous Safety Network One
b) Abstract Syntax Notation One
c) Arithmetic Syntax Notation One
d) Advanced System Network One
View Answer

Answer: b
Explanation: ASN.1 stands for Abstract Syntax Notation One. ASN.1 in computer networking is a standard used for defining data structures that are sent and received in a network.

2. ASN.1 is a formal language developed jointly by _______ and _______ for use with application layers for data transfer between systems.
a) IEEE, ISDN
b) IETF, ITU-T
c) ITU-T, ISO
d) ISDN, H.23
View Answer

Answer: c
Explanation: ASN.1 is a standard language used for describing messages sent and received in a network. It is a joint standard developed by International Telecommunication Union (ITU-T) and International Organization for Standardization (ISO).

3. How is Transfer Syntax different from Abstract Syntax?
a) It defines a set of rules used to define data types and structures for the storage of information
b) It represents the set of rules for communicating information between systems
c) It specifies the management protocol in the application layer
d) It makes ASN.1 independent of the lower-layer
View Answer

Answer: b
Explanation: The transfer syntax represents the set of rules for communicating information between systems. Whereas the Abstract Syntax is a set of rules used to specify data types and structures for the storage of information.

4. Abstract Syntax Notation One (ASN.1) uses the grammar of Backus-Naur Form.
a) True
b) False
View Answer

Answer: a
Explanation: ASN.1 is based on Backus system. It uses formal syntax language and grammar of Backus-Naur Form. Backus-Naur Form is a context-free grammar form.

5. The symbol ‘::=’ stands for________ in ASN.1 language.
a) Signed number
b) Alternatives
c) Assignment
d) Range
View Answer

Answer: c
Explanation: ASN.1 uses several symbols and primitive data types including keywords. There is a list of symbols used but the symbol ‘::=’ here stands for ‘Assignment’.

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6. In Abstract Syntax Notation One, we can group assignments that are related to each other; is group is called _______
a) range
b) cluster
c) class
d) module
View Answer

Answer: d
Explanation: ASN.1 is a standard language used for describing messages sent and received in a network. ASN.1 uses several symbols and primitive data types including keywords. Thus we can group similar assignments to form a Module.

7. The universal tag ‘ENUMERATED’ in ASN.1 defines ___________
a) specified list of Integers
b) a string of binary digits or null set
c) set of values associated with the object
d) unordered list of types
View Answer

Answer: a
Explanation: The universal class is the most commonly used class. Data types belonging to the universal class are application-independent. ENUMERATED is an example of universal class that is used to mean a specified list of Integers.

8. Abstract syntax is applicable to communication model of OSI Network Management.
a) True
b) False
View Answer

Answer: b
Explanation: The abstract syntax is defined the set of rules used to specify data types and structures for the storage of information. The abstract syntax is applicable to the information model whereas Transfer syntax is applicable to communication model.

9. The terms_______, _______ and _____ are primitives and are called keywords in ASN.1
a) DEFINITIONS, BEGIN, END
b) IDENTIFIER, IMPORTS, INTEGER
c) GET, GETNEXT, SET
d) GETBULK, GETREQUEST, TRAP
View Answer

Answer: a
Explanation: The terms DEFINITIONS, BEGIN and END are primitives and are called keywords in ASN.1. They are built-in expressions and have special meaning. GET, GETNEXT, SET, GETBULK, GETREQUEST and TRAP are commands used in SNMP.

10. _________ is the algorithm used to convert textual ASN.1 syntax to machine-readable code.
a) Modulation Error Rate (MER)
b) Viterbi Error Rate (VER)
c) Symbol Error Rate (SER)
d) Bit Error Rate(BER)
View Answer

Answer: d
Explanation: The algorithm used to convert ASN.1 syntax to machine-readable code is defined in ISO 8825/X.209 standards. It is usually called Basic Encoding Rules (BER).

11. ASN.1 does not enable rapid and reliable transmission of extensible messages compared to other notations.
a) True
b) False
View Answer

Answer: b
Explanation: ASN.1 when compared to other notations, is more streamlined and reliable for transmission of messages. It provides efficient communication.

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