EC-COUNCIL 312-38 Online Practice Questions and Exam Preparation

EC-COUNCIL 312-38 Online Questions & Answers

• Question 511:

  Fill in the blank with the appropriate term. The protocol is a feature of packet-based data transmission protocols. It is used to keep a record of the frame sequences sent and their respective acknowledgements received by both the users.

  Sliding Window

  Explanation/Reference:

  The Sliding Window protocol is a feature of packet-based data transmission protocols. It is used in the data link layer (OSI model) as well as in TCP (transport layer of the OSI model). It is used to keep a record of the frame sequences sent, and their respective acknowledgements received, by both the users. Its additional feature over a simpler protocol is that can allow multiple packets to be "in transmission" simultaneously, rather than waiting for each packet to be acknowledged before sending the next.In transmit flow control, sliding window is a variable-duration window that allows a sender to transmit a specified number of data units before an acknowledgment is received or before a specified event occurs.An example of a sliding window is one in which, after the sender fails to receive an acknowledgment for the first transmitted frame, the sender "slides" the window, i.e., resets the window, and sends a second frame. This process is repeated for the specified number of times before the sender interrupts transmission. Sliding window is sometimes called acknowledgment delay period.

• Question 512:

  Assume that you are a network administrator and the company has asked you to draft an Acceptable Use Policy (AUP) for employees. Under which category of an information security policy does AUP fall into?

  A. Incident Response Policy (IRP)
  B. Issue Specific Security Policy (ISSP)
  C. Enterprise Information Security Policy (EISP)
  D. System Specific Security Policy (SSSP)
  D. System Specific Security Policy (SSSP)

• Question 513:

  Match the following NIST security life cycle components with their activities:

  

  A. 1-iv, 2- iii,3-v,4-i
  B. 1-ii,2-i,3-v,4-iv
  C. 1-i,2-v,3-iii,4-ii
  D. 1-iii,2-iv,3-v,4-i
  A. 1-iv, 2- iii,3-v,4-i

• Question 514:

  Which of the following is susceptible to a birthday attack?

  A. Authentication
  B. Integrity
  C. Authorization
  D. Digital signature
  D. Digital signature

• Question 515:

  Richard has been working as a Linux system administrator at an MNC. He wants to maintain a productive and secure environment by improving the performance of the systems through Linux patch management. Richard is using Ubuntu and wants to patch the Linux systems manually. Which among the following command installs updates (new ones) for Debian-based Linux OSes?

  A. sudo apt-get upgrade
  B. sudo apt-get dist-update
  C. sudo apt-get dist-upgrade
  D. sudo apt-get update
  C. sudo apt-get dist-upgrade

• Question 516:

  How can a WAF validate traffic before it reaches a web application?

  A. It uses a role-based filtering technique
  B. It uses an access-based filtering technique
  C. It uses a sandboxing filtering technique
  D. It uses a rule-based filtering technique
  D. It uses a rule-based filtering technique

• Question 517:

  Which of the following protocols is used in wireless networks?

  A. CSMA
  B. CSMA/CD
  C. ALOHA
  D. CSMA/CA
  D. CSMA/CA

• Question 518:

  Which of the following cables is made of glass or plastic and transmits signals in the form of light?

  A. Coaxial cable
  B. Twisted pair cable
  C. Plenum cable
  D. Fiber optic cable
  D. Fiber optic cable

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  Explanation/Reference:

  Fiber optic cable is also known as optical fiber. It is made of glass or plastic and transmits signals in the form of light. It is of cylindrical shape and consists of three concentric sections: the core, the cladding, and the jacket. Optical fiber carries much more information than conventional copper wire and is in general not subject to electromagnetic interference and the need to retransmit signals. Most telephone company's long-distance lines are now made of optical fiber. Transmission over an optical fiber cable requires repeaters at distance intervals. The glass fiber requires more protection within an outer cable than copper. Answer option B is incorrect. Twisted pair cabling is a type of wiring in which two conductors (the forward and return conductors of a single circuit) are twisted together for the purposes of canceling out electromagnetic interference (EMI) from external sources. It consists of the following twisted pair cables: Shielded Twisted Pair: Shielded Twisted Pair (STP) is a special kind of copper telephone wiring used in some business installations. An outer covering or shield is added to the ordinary twisted pair telephone wires; the shield functions as a ground. Twisted pair is the ordinary copper wire that connects home and many business computers to the telephone company. Shielded twisted pair is often used in business installations. Unshielded Twisted Pair: Unshielded Twisted Pair (UTP) is the ordinary wire used in home. UTP cable is also the most common cable used in computer networking. Ethernet, the most common data networking standard, utilizes UTP cables. Twisted pair cabling is often used in data networks for short and medium length connections because of its relatively lower costs compared to optical fiber and coaxial cable.UTP is also finding increasing use in video applications, primarily in security cameras. Many middle to high-end cameras include a UTP output with setscrew terminals. This is made possible by the fact that UTP cable bandwidth has improved to match the baseband of television signals. Answer option A is incorrect. Coaxial cable is the kind of copper cable used by cable TV companies between the community antenna and user homes and businesses. Coaxial cable is sometimes used by telephone companies from their central office to the telephone poles near users. It is also widely installed for use in business and corporation Ethernet and other types of local area network. Coaxial cable is called "coaxial" because it includes one physical channel that carries the signal surrounded (after a layer of insulation) by another concentric physical channel, both running along the same axis. The outer channel serves as a ground. Many of these cables or pairs of coaxial tubes can be placed in a single outer sheathing and, with repeaters, can carry information for a great distance. It is shown in the figure below:

  

  Answer option C is incorrect. Plenum cable is cable that is laid in the plenum spaces of buildings. The plenum is the space that can facilitate air circulation for heating and air conditioning systems, by providing pathways for either heated/ conditioned or return airflows. Space between the structural ceiling and the dropped ceiling or under a raised floor is typically considered plenum. However, some drop ceiling designs create a tight seal that does not allow for airflow and therefore may not be considered a plenum air-handling space. The plenum space is typically used to house the communication cables for the building's computer and telephone network.

• Question 519:

  Which of the following TCP commands are used to allocate a receiving buffer associated with the specified connection?

  A. Send
  B. Close
  C. None
  D. Receive
  E. Interrupt
  D. Receive

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  Explanation/Reference:

  The Receive command is used to allocate a receiving buffer associated with the specified connection. An error is returned if no OPEN precedes this command or the calling process is not authorized to use this connection. Answer option A is

  incorrect. The Send command causes the data contained in the indicated user buffer to be sent to the indicated connection.

  Answer option C is incorrect. The Abort command causes all pending SENDs and RECEIVES to be aborted.

  Answer option B is incorrect. The Close command causes the connection specified to be closed.

• Question 520:

  Which of the following TCP/IP state transitions represents no connection state at all?

  A. Closed
  B. Closing
  C. Close-wait
  D. Fin-wait-1
  A. Closed