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In data communication, jitter refers to ___________

  • Q. In data communication, jitter refers to ___________
  • filter_dramaExplanation
    Answer is : D

    The effective of a data communications system depends on four fundamental characteristics:

    Delivery, Accuracy, Timeliness and Jitter.

    Delivery: The system must deliver data to the correct destination; Data must be received by the intended device or user

    Accuracy: The system must deliver the data accurately; Data that have been altered in transmission and left uncorrected are unusable

    Timeliness: The system must deliver data in a timely manner; Data delivered late are useless

    Jitter: Jitter refers to the variation in the packet arrival time; It is the uneven delay in the delivery of audio or video packets

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Similar Questions

  • 1. _______ symbol is used to see every column of a table.
  • filter_dramaExplanation
    Answer is : C

    The * symbol is used to see every column of a table.

     For Example, Let us consider a table Table1

    ID NAME AGE ADDRESS SALARY
    1 Akash 24 Bijnor 12000
    2 sema 23 Delhi 15000
    3 diya 33 Banglore 33000
    4 Badal 29 Odisha 40000

    If you want to fetch only some specific columns from the table, then we can use this query,

    Select ID,NAME,AGE from Table1;    // Syntax is Select (column_name1, coloumn_name2.....coloum_name) from table_name;

    ID NAME AGE
    1 Akash 24
    2 sema 23
    3 diya 33
    4 Badal 29

    If you want to fetch all the fields of the Table1 table, then you should use the following query 

    Select * from Table1;    // Syntax is Select * from table_name;

    ID NAME AGE ADDRESS SALARY
    1 Akash 24 Bijnor 12000
    2 sema 23 Delhi 15000
    3 diya 33 Banglore 33000
    4 Badal 29 Odisha 40000

    Therefore Option 3 is correct

  • 2.

    Database table by name Loan_Records is given below.

    Borrower

    Bank Manager

    Loan Amount

    Ramesh

    Sunderajan

    10000.00

    Suresh

    Ramgopal

    5000.00

    Mahesh

    Sunderajan

    7000.00


    What is the output of the following SQL query?

    SELECT count(*)

    FROM(

    (SELECT Borrower, Bank_Manager FROM Loan_Records) AS S

    NATURAL JOIN

    (SELECT Bank_Manager, Loan_Amount FROM Loan_Records) AS T

    );

  • filter_dramaExplanation
    Answer is : C

    Borrower

    Bank _ Manager

    Ramesh

    Sunderajan

    Suresh

    Ramgopal

    Mahesh

    Sunderjan

     

    Bank _ Manager

    Loan _ Amount

    Sunderajan

    10000.00

    Ramgopal

    5000.00

    Sunderjan

    7000.00

    After executing the given query, the output would be

    Borrower

    Bank_Manager

    Load_Amount

    Ramesh

    Sunderajan

    10000.00

    Ramesh

    Sunderajan

    7000.00

    Suresh

    Ramgopal

    5000.00

    Mahesh

    Sunderajan

    10000.00

    Mahesh

    Sunderajan

    7000.00

  • 3.

    Which of the following is the logical topology?

  • filter_dramaExplanation
    Answer is : A
    • Physical topology is the placement of the various components of a network (e.g., device location and cable installation)
    • Logical topology is the arrangement of devices on a computer network and how they communicate with one another
    • Mesh and star are example of physical topology
    • Token ring is a logical ring topology with a physical star topology
  • 4.

    Which of the following is valid order for SQL query evaluation? 

    Note: Options order from left to right.

  • filter_dramaExplanation
    Answer is : C

     The correct answer is option 3.

    Concept:

    The SQL order of execution specifies the order in which query clauses are executed. Some of the most common query issues might be easily avoided if people had a better understanding of the SQL order of execution, often known as the SQL order of operations.

    Order or SQL query evaluation:

    1. From: Cartesian product of tables.
    2. Where: Select the rows.
    3. Group by: Divide the rows into groups.
    4. Having: Select the groups.
    5. Expressions: Expressions In select are evaluated.
    6. Distinct: Distinct in select (Eliminate the duplicates).
    7. Ser-Operations: (Union, intersect, Except)
    8. Order By: Sort the rows.

    Hence the correct answer is Where, Having, Distinct, Order By.

  • 5. If a transaction may obtain locks but may not release any locks then it is in _______ phase
  • filter_dramaExplanation
    Answer is : A
    If a transaction may obtain locks but may not release any locks then it is in growing phase. Growing phase is a phase in two phased locking protocol.

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