The class based addressing is known as
Classless addressing
Classful addressing
Classified addressing
Classical addressing
Correct Answer :
B. Classful addressing
Related Questions
The physical location of a record is determined by a mathematical formula that transforms
a file key into a record location is :
B-Tree File
Hashed File
Indexed File
Sequential file.
In client/server computing data are
sent only upon the client's request
sent in complete copies for the client to filter and sort
never sent to the client machine
sent in very large sections to save processing time
What does the number of attributes in a relation is called?
Cardinality
Degree
Tuple
Order
Log into a computer across an internet
IMAP
TELNET
POP3
Infrared
Which of the following is true statement ?
SQL permits attribute names to be repeated in the same relation.
a SQL query automatically eliminates duplicates.
a SQL query will not work if there are no indexes on the relations
None of these
A relation which is in 3NF is
in 1NF also
in 2NF also
free from transitive dependencies
All of these
A …………… is a memory area where data are processed.
view
trigger
cursor
none of the above
Which of the following statement returns data to the host variables one at a time?
SELECT
RETURN
FETCH
GET
In which of the random-access method, stations do not sense the medium?
ALOHA
ETHERNET
CSMA/CA
CSMA/CD
Aggregate functions are also called
serial functions
non-serial functions
row functions
column functions
Commit operation …………… writes the changes made to the database.
temporarily
permanently
none of these
all of the above
Benefit of database normalization is
smaller number of tables
higher query processing efficiency
reduced I/O for most queries
reduced data redundancy
In which of the following SET concept is used ?
Network Model
Hierarchical Model
Relational Model
None of these
The ________ states that a foreign key must either match a primary key value in another relation or it must be null.
entity integrity rule
referential integrity constraint
composite attribute
action assertion
Only one communication channel is needed rather than n channels to transmit data between two communicating devices
parallel
serial
analog
digital
QBE
Query By Execution
Query By Example
Query By Extraction
None of the above.
Which of the following works as a filter?
UPDATE
DROP
ALTER
SELECT
The union of primary keys of a related entity becomes …………. Of a relation.
primarykey
superkey
candidatekey
foreignkey
A logical schema
is the entire database.
is a standard way of organizing information into accessible parts.
describes how data is actually stored on disk.
both A) and C)
Electromagnetic spectrum included in radiowaves are
i) Super High Frequency (SHF)
ii) Very High Frequency (VHF)
iii) Ultra High Frequency (UHF)
iv) High Frequencies (HF)
i, ii and iii only
i, ii and iv only
ii, iii and iv only
i, iii and iv only
Select the incorrect statement(s)
i) Foreign key values can be left blank
ii) In SQL duplicates may be present
iii) Theta join operation doesnt remove duplicate columns.
iv) NULL value means string of blank characters.
i ,iii only
ii, iv only
iii, iv only
ii, iii, iv
In defining the notion of the tuple variable, which one of the clause is useful?
as
by
from
none of the above
Which of the following is a classical approach to database design?
Left Right approach
Right Left approach
Top Down approach
Bottom Up approach
.................. means sending a digital signal over a channel without changing the digital signal to an analog signal.
Baseband transmission
Broadband transmission
Digital transmission
Analog transmission
The privilege lists include
i) select
ii) insert
iii) update
iv) delete
only i)
only i) ii)
only i) ii) iii)
i) ii) iii) iv)
A subschema expresses
the logical view.
the physical view.
the external view.
all of the above.
Which of the following is logical topology?
Bus
Ring
Star
None of these
Select the incorrect statement
BCNF is stronger than 3NF
Relational algebra is a non-procedural language
Every conflict serializable schedule is view serializable.
none of the above
which of the following is a binary operation?
project
select
rename
none of the above
If the .................... is too much, the receiver may not be able to detect the signal at all or the signal may fall below the noise level.
Noise
Delay
Dispersion
Attenuation