IT Computer Security Quiz Questions

Yes, making a copy of a music CD without the permission of the copyright holder is considered copyright infringement and is against the law.

The statement accurately defines vulnerability as a means for an attacker to gain unauthorized access to a system. A vulnerability refers to a weakness or flaw in the system's security measures that can be exploited by an attacker to compromise the system's integrity, confidentiality, or availability. Therefore, the correct answer is "True."

A closed port responds to a SYN Packet with an RST packet. When a SYN packet is sent to a closed port, the receiving system will respond with an RST (reset) packet to indicate that the port is closed and not accepting connections. This helps in quickly identifying closed ports during network scanning or connection attempts. The variations in capitalization (RST, rst, Rst) do not affect the meaning or correctness of the answer.

This statement is false because it is possible to notice someone using a packet sniffer on the network. A packet sniffer is a tool used to capture and analyze network traffic, and there are various ways to detect its presence. Network administrators can monitor network traffic for suspicious activity, such as an unusually high number of packets being captured or unusual patterns in the captured data. Additionally, network security measures can be implemented to detect and block packet sniffers on the network.

Physical dangers such as earthquakes and flooding can indeed be considered a security concern. While they may not directly relate to issues of personal safety or protection from intentional harm, they can still pose significant risks to individuals, communities, and even national security. For example, natural disasters can disrupt critical infrastructure, lead to loss of life and property, create social unrest, and even provide opportunities for malicious actors to exploit vulnerabilities. Therefore, it is incorrect to say that physical dangers are not considered a security concern.

It is possible to capture packets that are not destined for your machine because of the way network protocols work. When packets are sent over a network, they are often broadcasted or sent to multiple devices. Network sniffing tools can intercept and capture these packets, allowing users to analyze the network traffic and potentially capture packets that are not intended for their own machine.

Authentication in security environments refers to the process of confirming an individual's identity with a unique element. This unique element could be a password, a fingerprint, a smart card, or any other factor that is specific to the individual. By confirming the identity, the system ensures that the user is who they claim to be before granting access to resources or assigning access rights.

Packet sniffers are tools used to capture and analyze network traffic. They can intercept and display the contents of packets, including the payload. Therefore, the statement that packet sniffers cannot read or interpret the payload in a packet is false. Packet sniffers are specifically designed to capture and analyze the data within packets, allowing users to examine the contents and analyze network communication.

The Computer Security Triad consists of three fundamental principles: confidentiality, integrity, and availability. These principles are essential for ensuring the security of computer systems and data. Ease of use, on the other hand, is not a fundamental principle of the triad. While it is important to consider usability in the design and implementation of security measures, it is not one of the core principles that the triad focuses on.

The ICMP protocol, or Internet Control Message Protocol, is specifically designed to check and report on network error conditions. It is used by network devices to send error messages and operational information, allowing for the detection and reporting of issues such as unreachable hosts, network congestion, or routing problems. ICMP helps in troubleshooting and diagnosing network problems by providing feedback about the status and errors occurring within a network.

Hackers attack systems for various reasons, including profit, religious/political/ethical motivations, the "Mount Everest" syndrome (the desire to conquer a challenging target), and revenge. These motivations can drive hackers to exploit vulnerabilities in systems and gain unauthorized access, causing damage, stealing sensitive information, or disrupting services. The combination of these different reasons makes it difficult to pinpoint a single motive for hacking, as hackers can be driven by a mix of financial gain, personal beliefs, and personal vendettas.

When a threat is identified as being linked to a specific vulnerability, it becomes a risk. This means that the potential harm or damage that the threat can cause is now more likely to occur because there is a vulnerability that can be exploited. Without the identification of a vulnerability, the threat remains just a potential danger without a high likelihood of actually causing harm. Therefore, the statement "A threat becomes a risk only when it is identified as being linked to a specific vulnerability" is true.

A virus is a type of malicious software that attaches itself to a program or file and spreads from one computer to another. As it travels, it leaves infections in the files it infects. Unlike worms or Trojans, viruses require a host file or program to propagate and cannot spread on their own. Rootkits, on the other hand, are a type of malware that allows unauthorized access to a computer system, but they do not spread like viruses. Therefore, the correct answer is virus.

The statement is false because it is possible to map out a network, its resources, and how they are connected without physical access to the resources themselves. This can be done through various network mapping techniques such as network scanning, network discovery tools, and network monitoring software. These methods allow network administrators to gather information about the network topology, devices, and connections remotely, without the need for physical access to the resources.

The human element is considered the hardest vulnerability to properly protect against because humans are susceptible to making mistakes, being manipulated, or intentionally causing security breaches. Unlike technical vulnerabilities like open ports or bad passwords, which can be addressed through technological solutions, the human element involves unpredictable behavior and requires a combination of training, awareness, and ongoing monitoring to mitigate the risks.

Passive reconnaissance is used by hackers to observe and gather information about the target without directly interacting with it. This can include activities such as scanning networks, collecting publicly available information, or monitoring communication channels. On the other hand, active reconnaissance involves more direct and aggressive techniques to gain knowledge about the target. This can include activities such as port scanning, vulnerability scanning, or attempting to exploit weaknesses in the target's security.

Confidentiality is responsible for ensuring that personal information is not disclosed to unauthorized users. It involves protecting sensitive data from being accessed, viewed, or disclosed by unauthorized individuals. Confidentiality measures, such as encryption, access controls, and secure transmission protocols, are implemented to safeguard personal information and maintain privacy.

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Computer B will respond with an initial sequence number of its own and an acknowledgement number of 145678914. This is because in a TCP session, both computers need to establish synchronization by exchanging initial sequence numbers. Computer B generates its own initial sequence number and acknowledges the receipt of Computer A's initial sequence number by sending an acknowledgement number.

Multi-factor authentication ensures the strongest degree of authentication to access a system because it requires multiple forms of identification to verify the user's identity. This typically includes a combination of something the user knows (such as a password), something the user has (such as a token or smart card), and something the user is (such as a fingerprint or iris scan). By requiring multiple factors, it significantly increases the security of the authentication process and reduces the risk of unauthorized access.

A vulnerability refers to a weakness in a computer system that can be exploited by attackers to compromise its security. It represents a point of susceptibility where an attacker can gain unauthorized access, steal data, or disrupt system operations. Identifying and addressing vulnerabilities is crucial to maintaining the security and integrity of computer systems.

Granularity is not a security mechanism that can be used to support the elements of the CIA Triad. The CIA Triad consists of three components - confidentiality, integrity, and availability - which are essential for information security. Identification, authentication, authorization, and accountability are all security mechanisms that can be used to support these elements. Granularity, on the other hand, refers to the level of detail or precision in which something is measured or controlled, and it is not directly related to the CIA Triad or information security.

The small company should implement TCP (Transmission Control Protocol) because it provides reliable and secure communication by establishing a connection, ensuring data integrity, and retransmitting lost packets. TCP also offers flow control and congestion control mechanisms to optimize performance. UDP (User Datagram Protocol) does not guarantee reliable transmission or security, making it unsuitable for large financial transactions. IP (Internet Protocol) is a network layer protocol and ICMP (Internet Control Message Protocol) is used for network troubleshooting, so they are not suitable for the company's requirements. Therefore, TCP is the best choice for the company's needs.

Authentication is the correct answer because it refers to the process of verifying the identity of a user. It provides a means for objective verification by confirming that the user is who they claim to be, typically through the use of passwords, biometrics, or other security measures. Authentication is essential for ensuring that only authorized individuals can access sensitive information or perform certain actions, thereby enhancing the overall security of a system or network.

A security exploit refers to any method, technique, or tool that can be utilized to compromise or breach the security of a system. It can encompass various forms such as software vulnerabilities, hardware weaknesses, social engineering tactics, or even physical attacks. This broad definition includes all possible means by which an attacker can gain unauthorized access, steal information, disrupt operations, or cause harm to a system or its users.

High threat, high vulnerability poses a significant risk because it indicates a situation where there is a high likelihood of a threat occurring and a high potential for it to cause harm or damage. This combination increases the chances of negative consequences and the need for proactive measures to mitigate the risk.

UDP (User Datagram Protocol) is a connectionless protocol. Unlike TCP (Transmission Control Protocol), which establishes a connection between two devices before data transfer, UDP does not establish a connection and simply sends data packets without any guarantee of delivery or order. UDP is commonly used for applications that require low latency and can tolerate some data loss, such as streaming media, online gaming, and DNS (Domain Name System) queries.

A worm is a type of malware that can spread from computer to computer without any user intervention. Unlike viruses and trojans, worms do not require a host file or user action to replicate themselves. They can exploit vulnerabilities in network protocols or operating systems to automatically propagate and infect other systems. This makes worms particularly dangerous as they can quickly infect a large number of computers and cause widespread damage. In this case, the correct answer is A - Worm.

John is trying to achieve the goal of integrity. The goal of integrity ensures that the content of the e-mail remains unchanged and unaltered during transmission from Suzy to John. It ensures that the information has not been tampered with, modified, or corrupted in any way.

Nessus is designed as a vulnerability scanner. It is a widely used tool for identifying vulnerabilities in computer systems and networks. Nessus scans for known vulnerabilities and provides detailed reports on the findings. It helps organizations identify and address security weaknesses before they can be exploited by attackers.

The given correct answer suggests that the system is experiencing a SYN Stealth Open Port scan from Nmap. This type of scan involves sending a SYN packet to initiate a connection with the target system, but instead of completing the connection with an ACK packet, the attacker sends a RST packet to terminate the connection. This technique is used by hackers to identify open ports on a system without being detected.

When using a packet sniffer, you can observe all of the above parts of the packet. A packet sniffer allows you to capture and analyze network traffic, and it provides visibility into various aspects of the packets. By using a packet sniffer, you can observe the IP header content, protocol header content (such as TCP, UDP, ICMP), payload, and MAC address. This allows you to analyze and understand the different layers and components of the network packets being transmitted.

The Physical layer in the TCP/IP stack is responsible for physically moving electrons across a media or wire. This layer deals with the actual transmission of data bits over the network, including the electrical, mechanical, and functional aspects of the physical connection. It defines the specifications for cables, connectors, and other hardware components required for data transmission.

Defense in Depth is a security term used to represent the optimal information security strategy. It involves implementing multiple layers of security measures to protect against potential threats. This approach ensures that even if one layer is breached, there are additional layers in place to prevent unauthorized access and protect sensitive information. By implementing a combination of physical, technical, and administrative controls, organizations can create a strong defense system that reduces the risk of successful attacks. Separation of Privileges, Principle of Least Privileges, and Security through obscurity are also important security concepts but are not specifically synonymous with the optimal security strategy represented by Defense in Depth.

Each TCP connection is uniquely identified by the combination of the source and destination IP addresses and the source and destination port numbers. The IP addresses identify the source and destination devices, while the port numbers specify the specific application or service running on those devices. The sequence number and connection number are not used for uniquely identifying TCP connections.

Ignorance is not considered a category of exploit. Exploits are typically categorized based on the method or location of the attack. "Over the Internet," "Over the LAN," "Locally," and "Offline" are all categories that describe different ways in which an exploit can occur. However, "Ignorance" does not fit into any of these categories and is not a recognized category of exploit.

All of the given software tools (Ping, Traceroute, Route, Nmap) can be effective for security purposes. Ping can be used to check the availability of a host and detect any potential network issues, Traceroute can help identify the path that network packets take to reach a destination and detect any suspicious hops, Route can be used to view and manipulate the routing table of a network device, and Nmap is a powerful network scanning tool that can be used for security auditing and discovering vulnerabilities. Therefore, none of the above options are not effective for security purposes.

Information security is concerned with protecting the confidentiality, integrity, and availability of information. Resources management, on the other hand, focuses on efficiently and effectively managing an organization's resources, such as personnel, finances, and equipment. While information security is closely related to resources management, it is not solely concerned with it. Information security also includes other aspects such as risk management, incident response, and security awareness training. Therefore, resources management is the correct answer as it is not directly related to information security.

The correct answer is IP header. When capturing a packet using TCPDUMP, the packet is in raw hex format. The IP header is the first part of the packet that contains information such as the source and destination IP addresses, protocol version, packet length, and other important information about the IP packet.

Compromise refers to the loss of one of the goals of security, which is the protection of resources and data from unauthorized access, use, disclosure, disruption, modification, or destruction. When a compromise occurs, it means that the security measures in place have been breached, allowing an attacker to gain unauthorized access or control over the system, network, or data. This can lead to various negative consequences, such as data breaches, financial losses, reputational damage, and legal implications.

The three key elements in balancing security goals are security, ease of use, and functionality. Security ensures the protection of data and systems from unauthorized access or attacks. Ease of use focuses on making security measures user-friendly and convenient for individuals to use. Functionality ensures that security measures do not hinder the proper functioning and performance of systems and processes. Balancing these three elements is crucial in designing effective and efficient security measures that meet the needs of users while maintaining the integrity and availability of data and systems.

Snort is considered an Intrusion Detection System (IDS) because it is an open-source network intrusion prevention and detection system. It analyzes network traffic in real-time, looking for patterns and signatures of known attacks. It can also be configured to generate alerts or take action when suspicious activity is detected. Snort is widely used in the cybersecurity industry as an effective tool for monitoring and protecting network systems against various types of intrusions and attacks.

A packet sniffer needs to put the NIC card into promiscuous mode in order to work properly. This mode allows the network interface card to capture all network traffic, including packets that are not intended for the device. By enabling promiscuous mode, the packet sniffer can analyze and capture all network packets passing through the network, regardless of their destination. This is essential for monitoring and analyzing network traffic for security or troubleshooting purposes.

The TCP three-way handshake is a process used to establish a TCP connection between two devices. It involves the exchange of three packets. The SYN (synchronize) flag is set in the first packet sent by the client to the server to initiate the connection. The server responds with a packet that has both the SYN and ACK (acknowledge) flags set, indicating that it received the client's request and is willing to establish a connection. Finally, the client sends a packet with only the ACK flag set to acknowledge the server's response. Therefore, the two flags required to be set across these three packets are the SYN Flag and the ACK Flag.

A fragmented IP datagram is reassembled by the destination host. When a large IP datagram is fragmented into smaller pieces for transmission over a network, it is the responsibility of the destination host to receive and reassemble these fragments into the original datagram. This process is done using the identification field and fragment offset field in the IP header, which allow the destination host to correctly order and combine the fragments. The routers along the path only handle the forwarding of the individual fragments, while the application processing the information datagram is not involved in the reassembly process.

The highlighted portion of the captured packet code "4017" indicates the protocol field in the IP header. In this case, the value "17" corresponds to the UDP (User Datagram Protocol) protocol. Therefore, the protocol identified as being used in the payload portion of this IP packet is UDP.

Hackers can defeat Availability by using the mechanism of Destruction. This means they can intentionally destroy or disrupt the availability of a system, network, or service, making it inaccessible or unusable for legitimate users. This can be done through various methods such as launching a denial of service (DoS) attack, destroying physical infrastructure, or deleting critical data. By causing destruction, hackers can effectively prevent users from accessing or using the targeted resource, compromising its availability.

Connecting via telnet to the company's web server is one method of gathering information about the operating system a company is using. By connecting through telnet, one can access the command-line interface of the web server and gather information about the operating system running on it. This method allows for direct interaction with the server and can provide valuable information about the underlying technology being used.

The Presentation Layer in the OSI model is responsible for data encryption and decryption. It ensures that the data is properly formatted and encrypted before transmission, and decrypts it at the receiving end. This layer also handles data compression, encryption, and decryption algorithms, ensuring that the data is secure and can be understood by the receiving application.

Availability is the element of the CIA Triad that ensures that legitimate users maintain access to information and resources they require access to. It focuses on making sure that the systems and data are accessible and usable when needed, preventing any disruptions or downtime that could hinder the users' ability to access the necessary information. This includes implementing measures such as redundancy, backups, and disaster recovery plans to ensure continuous availability of resources.