Information Technology: Test 1

10 questions · 15 minutes · scoring and calculator rules shown before you begin

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Information Technology Test 1: questions and answers

Take the test first if you want an honest score. The answers and solutions below are folded away until you open them.

  1. 1. How many layers are there in the OSI reference model?
    1. 7
    2. 5
    3. 4
    4. 6

    Reference: q-1b450e22-54 · Report this question

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    Answer: A. 7

    The OSI model has seven layers, from Physical to Application.
  2. 2. Which of the following is NOT a DML command in SQL?
    1. CREATE
    2. UPDATE
    3. INSERT
    4. DELETE

    Reference: q-cd68f9c5-52 · Report this question

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    Answer: A. CREATE

    CREATE is a DDL command; the others change data and are DML commands.
  3. 3. The key chosen to uniquely identify each record in a table is called the
    1. Alternate key
    2. Secondary key
    3. Primary key
    4. Foreign key

    Reference: q-5c0efc7a-73 · Report this question

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    Answer: C. Primary key

    The primary key uniquely identifies each row of a table.
  4. 4. A stack works on the principle of
    1. FIFO (first in, first out)
    2. LIFO (last in, first out)
    3. Round robin
    4. Priority order

    Reference: q-7f8473db-34 · Report this question

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    Answer: B. LIFO (last in, first out)

    The last item pushed on to a stack is the first to be removed.
  5. 5. An IPv4 address is made up of
    1. 16 bits
    2. 32 bits
    3. 128 bits
    4. 64 bits

    Reference: q-d5958e14-30 · Report this question

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    Answer: B. 32 bits

    An IPv4 address has 32 bits; an IPv6 address has 128.
  6. 6. The default port number of HTTP is
    1. 80
    2. 21
    3. 25
    4. 443

    Reference: q-7e346348-35 · Report this question

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    Answer: A. 80

    HTTP uses port 80. HTTPS uses 443, FTP 21 and SMTP 25.
  7. 7. Which of the following is a connectionless protocol?
    1. TCP
    2. HTTP
    3. FTP
    4. UDP

    Reference: q-aa669dc8-53 · Report this question

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    Answer: D. UDP

    UDP sends data without first setting up a connection.
  8. 8. Which layer of the OSI model is responsible for routing?
    1. Transport layer
    2. Session layer
    3. Network layer
    4. Data link layer

    Reference: q-c32e9b47-57 · Report this question

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    Answer: C. Network layer

    Routing of packets between networks is done at the Network layer.
  9. 9. In object-oriented programming, wrapping data and the functions that work on it into a single unit is called
    1. Encapsulation
    2. Polymorphism
    3. Abstraction
    4. Inheritance

    Reference: q-12705720-109 · Report this question

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    Answer: A. Encapsulation

    Encapsulation binds data and methods together in a class.
  10. 10. The process of organising data in a database to reduce redundancy is called
    1. Indexing
    2. Fragmentation
    3. Replication
    4. Normalization

    Reference: q-9c7729b9-76 · Report this question

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    Answer: D. Normalization

    Normalization organises tables so that data is not repeated.

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