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EC-COUNCIL Certification
312-38 Exam
EC-COUNCIL.312-38.v2024-08-10.q281 Dumps

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Question 156

Which of the following key features is used by TCP in order to regulate the amount of data sent by a host to another host on the network?

A.Sequence number
B.TCP timestamp
C.Congestion control
D.Flow control

Correct Answer: D

Flow control is the process of regulating the amount of data sent by a host to another host on the network. The flow control mechanism controls packet flow so that a sender does not transmit more packets than a receiver can process. TCP uses a sliding window flow control protocol. In each TCP segment, the receiver specifies in the receive window field the amount of additional received data (in bytes) that it is willing to buffer for the connection. The sending host can send only up to that amount of data before it must wait for an acknowledgment and window update from the receiving host.
Answer option A is incorrect. TCP uses a sequence number for identifying each byte of data.
Answer option B is incorrect. TCP timestamp helps TCP to compute the round-trip time between the sender and receiver.
Answer option C is incorrect. Congestion control concerns controlling traffic entry into a telecommunications network, so as to avoid congestive collapse by attempting to avoid oversubscription of any of the processing or link capabilities of the intermediate nodes and networks and taking resource reducing steps, such as reducing the rate of sending packets. It should not be confused with flow control, which prevents the sender from overwhelming the receiver.

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Question 157

Which of the following is a type of computer security that deals with protection against spurious signals emitted by electrical equipment in the system?

A.Communication Security
B.Physical security
C.Emanation Security
D.Hardware security

Correct Answer: C

Explanation
Explanation:
Emanation security is one of the types of computer security that deals with protection against spurious signals emitted by electrical equipment in the system, such as electromagnetic emission (from displays), visible emission (displays may be visible through windows), and audio emission (sounds from printers, etc). Answer option D is incorrect. Hardware security helps in dealing with the vulnerabilities in the handling of hardware.
Answer option B is incorrect. Physical security helps in dealing with protection of computer hardware and associated equipment.
Answer option A is incorrect. Communication security helps in dealing with the protection of data and information during transmission.

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Question 158

Which field is not included in the TCP header?

A.Source IP address
B.Acknowledgment number
C.Source port
D.Sequence number

Correct Answer: A

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Question 159

You are monitoring your network traffic with the Wireshark utility and noticed that your network is experiencing a large amount of traffic from a certain region. You suspect a DoS incident on the network. What will be your first reaction as a first responder?

A.Avoid Fear, Uncertainty and Doubt
B.Communicate the incident
C.Make an initial assessment
D.Disable Virus Protection

Correct Answer: C

As a first responder to a suspected DoS incident, the initial reaction should be to make an initial assessment. This involves quickly evaluating the situation to understand the scope and impact of the incident. An initial assessment helps in determining whether the unusual traffic is indeed a DoS attack or a false positive. It also aids in deciding the next steps, such as whether to escalate the incident, what resources are required, and how to communicate the issue to relevant stakeholders.

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Question 160

Mark is monitoring the network traffic on his organization's network. He wants to detect a TCP and UDP ping sweep on his network. Which type of filter will be used to detect this on the network?

A.Tcp.srcport==7 and udp.srcport==7
B.Tcp.srcport==7 and udp.dstport==7
C.Tcp.dstport==7 and udp.srcport==7
D.Tcp.dstport==7 and udp.dstport==7

Correct Answer: D

To detect TCP and UDP ping sweeps on a network, the appropriate filter would be one that checks for packets directed at port 7, which is commonly used for the 'echo' service. This service is associated with ping functionality for both TCP and UDP protocols. Therefore, the correct filter to use would be Tcp.dstport==7 and udp.dstport==7, which checks for incoming packets where the destination port is 7 for both TCP and UDP traffic. This allows Mark to identify ping sweep attempts, as these would typically send packets to this port to elicit a response from the network.

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