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NEW QUESTION # 36
What is the maximum size in bytes of an ethernet packet?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: D
Explanation:
The maximum transmission unit (MTU) for Ethernet, which is the largest size of an Ethernet packet or frame that can be sent over the network, is typically 1500 bytes. This size does not include the Ethernet frame's preamble and start frame delimiter but does include all other headers and the payload. Ethernet's MTU of 1500 bytes is a standard for most Ethernet networks, especially those conforming to the IEEE 802.3 standard.
Reference:
IEEE 802.3-2012, "Standard for Ethernet".
NEW QUESTION # 37
Which of the following steps is used to reveal the IP addressing?
- A. Footprinting
- B. Surveillance
- C. Cover your tracks
- D. Enumeration
Answer: D
Explanation:
Enumeration is a step in the information-gathering phase of a penetration test or cyber attack where an attacker actively engages with the target to extract detailed information, including IP addressing.
Enumeration: During enumeration, the attacker interacts with network services to gather information such as user accounts, network shares, and IP addresses.
Techniques: Common techniques include using tools like Nmap, Netcat, and Nessus to scan for open ports, services, and to identify the IP addresses in use.
Purpose: The goal is to map the network's structure, find potential entry points, and understand the layout of the target environment.
Because enumeration involves discovering detailed information including IP addresses, it is the correct answer.
Reference
"Enumeration in Ethical Hacking," GeeksforGeeks, Enumeration.
"Network Enumeration," Wikipedia, Network Enumeration.
NEW QUESTION # 38
How many main score areas are there in the CVSS?2
- A. 0
- B. 1
- C. None of these
- D. 2
Answer: A
Explanation:
The Common Vulnerability Scoring System (CVSS) is a framework for rating the severity of security vulnerabilities. CVSS provides three main score areas: Base, Temporal, and Environmental.
Base Score evaluates the intrinsic qualities of a vulnerability.
Temporal Score reflects the characteristics of a vulnerability that change over time.
Environmental Score considers the specific impact of the vulnerability on a particular organization, tailoring the Base and Temporal scores according to the importance of the affected IT asset.
Reference:
FIRST, "Common Vulnerability Scoring System v3.1: Specification Document".
NEW QUESTION # 39
What is the size of the AH in bits with respect to width?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: D
Explanation:
The Authentication Header (AH) in the context of IPsec has a fixed header portion of 24 bits and a mutable part that can vary, but when considering the fixed structure of the AH itself, the width is typically considered to be 32 bits at its core structure for basic operations in providing integrity and authentication, without confidentiality.
Reference:
RFC 4302, "IP Authentication Header".
NEW QUESTION # 40
Which component of the IT Security Model is attacked with interruption?
- A. Authentication
- B. Availability
- C. Confidentiality
- D. Integrity
Answer: B
Explanation:
The IT Security Model commonly refers to the CIA Triad, which stands for Confidentiality, Integrity, and Availability.
An attack on "Availability" is aimed at disrupting the normal functioning and access to data or resources in a network. This type of attack can include actions such as DDoS (Distributed Denial of Service), where overwhelming traffic is sent to a system to make it unresponsive.
The main goal of attacks on availability is to prevent legitimate users from accessing systems or information, which can have significant implications for business operations and security.
Reference
Understanding the CIA Triad in Cybersecurity: https://www.cyber.gov.au/acsc/view-all-content/publications/cia-triad Denial of Service - What it is and how to prevent it: https://www.us-cert.gov/ncas/tips/ST04-015
NEW QUESTION # 41
Which mode within IPsec provides a secure connection tunnel between two endpoints AND protects the sender and the receiver?
- A. Covered
- B. Protected
- C. Tunnel
- D. Transport
Answer: C
Explanation:
IPsec (Internet Protocol Security) has two modes: Transport mode and Tunnel mode.
Tunnel mode is used to create a secure connection tunnel between two endpoints (e.g., two gateways, or a client and a gateway) and it encapsulates the entire IP packet.
This mode not only protects the payload but also the header information of the original IP packet, thereby providing a higher level of security compared to Transport mode, which only protects the payload.
Reference
Kent, S. and Seo, K., "Security Architecture for the Internet Protocol," RFC 4301, December 2005.
"IPsec Services," Microsoft TechNet.
NEW QUESTION # 42
Which of the following names represents inbound filtering?
- A. Ingress
- B. Sanity
- C. Funnel
- D. Egress
Answer: A
Explanation:
Ingress filtering is a method used in network security to ensure that incoming packets are allowed or blocked based on a set of security rules.
This type of filtering is often implemented at the boundaries of networks to prevent unwanted or harmful traffic from entering a more secure internal network.
The term "ingress" refers to traffic that is entering a network boundary, whereas "egress" refers to traffic exiting a network.
Reference
Cisco Networking Academy Program: Network Security.
"Understanding Ingress and Egress Filtering," Network Security Guidelines, TechNet.
NEW QUESTION # 43
Which of the following are valid TCP flags?
- A. IGP,ACK,SYN,PSH,URG
- B. FIN,PSH,URG,RST,SYN
- C. BGP,FIN,PSH,SYN,ACK
- D. None of these
Answer: B
Explanation:
TCP flags are used in the header of TCP segments to control the flow of data and to indicate the status of a connection. Valid TCP flags include:
FIN: Finish, used to terminate the connection.
PSH: Push, instructs the receiver to pass the data to the application immediately.
URG: Urgent, indicates that the data contained in the segment should be processed urgently.
RST: Reset, abruptly terminates the connection upon error or other conditions.
SYN: Synchronize, used during the initial handshake to establish a connection.
These flags are integral to managing the state and flow of TCP connections.
Reference:
Douglas E. Comer, "Internetworking with TCP/IP Vol.1: Principles, Protocols, and Architecture".
NEW QUESTION # 44
What form of attack uses a vector that infects a software package?
- A. All of these
- B. Quicksand
- C. Spam
- D. Watering Hole
Answer: D
Explanation:
A "watering hole" attack is a security exploit in which the attacker seeks to compromise a specific group of end users by infecting websites that members of the group are known to visit.
The goal is to infect a website that members of a targeted community frequently use with malware. Once a user visits the compromised website, malware can be delivered to the user's system, exploiting vulnerabilities on their device.
This attack vector is used in scenarios where attackers want to breach secure environments indirectly by targeting less secure points in a network's ecosystem, such as third-party software used within the organization.
Reference
"Watering Hole Attacks: Detect, Disrupt, and Prevent," by Kaspersky Lab.
"Emerging Threats in Cybersecurity: Understanding Watering Hole Attacks," published in the Journal of Network Security.
NEW QUESTION # 45
What is the extension of nmap scripts?
- A. .nse
- B. .nsv
- C. .nsn
- D. .ns
Answer: A
Explanation:
Nmap scripts, which are used to enhance the functionality of Nmap for performing network discovery, security auditing, and other tasks, have the extension .nse. This stands for Nmap Scripting Engine, which allows users to write scripts to automate a wide variety of networking tasks.
Reference:
Nmap Network Scanning by Gordon Lyon (also known as Fyodor Vaskovich), detailing the use and examples of Nmap scripts.
NEW QUESTION # 46
Which of the CVSS metrics refer to the exploit quotient of the vulnerability?
- A. All of these
- B. Temporal
- C. IBase
- D. Environmental
Answer: B
Explanation:
The Common Vulnerability Scoring System (CVSS) uses several metrics to assess the severity of vulnerabilities. Among them, the Temporal metric group specifically reflects the exploit quotient of a vulnerability.
Temporal metrics consider factors that change over time after a vulnerability is initially assessed. These include:
Exploit Code Maturity: This assesses the likelihood of the vulnerability being exploited based on the availability and maturity of exploit code.
Remediation Level: The level of remediation available for the vulnerability, which influences the ease of mitigation.
Report Confidence: This metric measures the reliability of the reports about the vulnerability.
These temporal factors directly affect the exploitability and potential threat posed by a vulnerability, adjusting the base score to provide a more current view of the risk.
Reference
Common Vulnerability Scoring System v3.1: User Guide.
"Understanding CVSS," by FIRST (Forum of Incident Response and Security Teams).
NEW QUESTION # 47
A protocol analyzer that produces raw output is which of the following?
- A. tcpdump
- B. Wireshark
- C. Capsa
- D. Commview
Answer: A
Explanation:
tcpdump is a powerful command-line packet analyzer used primarily in UNIX and UNIX-like operating systems; it allows the capture and display of TCP/IP and other packets being transmitted or received over a network to which the computer is attached.
Unlike graphical tools like Wireshark, tcpdump provides raw output of the packet captures directly to the terminal or a specified file, making it ideal for deep dive network analysis, especially in environments where a graphical user interface is unavailable.
tcpdump uses the libpcap library to capture packet data, which allows it to support a wide range of command-line options to filter and display packet information according to user needs.
Reference
"tcpdump manual page," by the Tcpdump Group.
"Practical Packet Analysis Using Wireshark to Solve Real-World Network Problems," by Chris Sanders, No Starch Press.
NEW QUESTION # 48
Which of the registrars contains the information for the domain owners in Latin America?
- A. ARIN
- B. RIPENCC
- C. LACNIC
- D. AFRINIC
Answer: C
Explanation:
LACNIC, the Latin American and Caribbean Internet Addresses Registry, is the regional internet registry (RIR) responsible for allocating and administering IP addresses and Autonomous System Numbers (ASNs) in Latin America and the Caribbean.
Function: LACNIC manages the distribution of internet number resources (IP addresses and ASNs) in its region, maintaining the registry of domain owners and other related information.
Coverage: The organization covers over 30 countries in Latin America and the Caribbean, including countries like Brazil, Argentina, Chile, and Mexico.
Services: LACNIC provides a range of services including IP address allocation, ASN allocation, reverse DNS, and policy development for internet resource management in its region.
Given this role, LACNIC is the correct answer for the registrar that contains information for domain owners in Latin America.
Reference
"About LACNIC," LACNIC, LACNIC Overview.
"Regional Internet Registries," Wikipedia, Regional Internet Registries.
NEW QUESTION # 49
Which mode within IPsec provides secure connection between two endpoints but does NOT protect the sender and the receiver?
- A. Covered
- B. Tunnel
- C. Transport
- D. Protected
Answer: C
Explanation:
IPsec offers two modes of operation: Transport mode and Tunnel mode.
Transport mode in IPsec provides security for the payload (the message part) of each packet along the communication path between two endpoints.
In this mode, the IP header of the original packet is not encrypted; it secures only the payload, not protecting the headers. This means while the data is protected, information about the sender and receiver as contained in the IP header is not obscured.
Reference
"Security Architecture for IP," RFC 4301.
IPsec documentation, Internet Engineering Task Force (IETF).
NEW QUESTION # 50
A Security Association is a __________ way connection?
- A. One
- B. Three
- C. None of these
- D. Two
Answer: A
Explanation:
A Security Association (SA) in the context of IPsec is a one-way logical connection used for secure communication between two endpoints. IPsec requires two SAs to establish a secure, bidirectional communication channel-one for each direction (inbound and outbound). This arrangement ensures that each direction is independently secured, with its own set of security parameters.
Reference:
RFC 4301, "Security Architecture for the Internet Protocol".
NEW QUESTION # 51
Which of the ICS/SCADA generations is considered distributed?
- A. Knapp, J. Langill, "Industrial Network Security," Syngress, 2014.
- B. Third
- C. Fourth
- D. Second
- E. First
Answer: B
Explanation:
The third generation of ICS/SCADA systems is considered distributed. This generation features systems that are networked and interconnected, typically using a variety of standard communication protocols. This distribution allows for broader connectivity and integration with other systems, enhancing operational flexibility and efficiency but also introducing more vectors for potential cyber threats.
Reference:
Joseph Weiss, "Protecting Industrial Control Systems from Electronic Threats".
The third generation of ICS/SCADA systems is considered distributed. These systems emerged in the late 1990s and early 2000s and were designed to overcome the limitations of earlier generations by leveraging networked architectures.
Distributed Architecture: Third-generation systems distributed control functions across multiple interconnected devices and systems, providing greater scalability and flexibility.
Network Integration: These systems integrated more extensively with IT networks, allowing for remote monitoring and control.
Standard Protocols: Adoption of standard communication protocols (e.g., Ethernet, TCP/IP) facilitated interoperability and integration with other systems.
Enhanced Redundancy: Improved fault tolerance and redundancy were implemented to ensure system reliability.
Due to these features, the third generation is known as the distributed generation.
Reference
"SCADA Systems," SCADAHacker, SCADA Generations.
NEW QUESTION # 52
How many IPsec rules are there in Microsoft Firewall configuration?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: A
Explanation:
In the configuration of Microsoft Windows Firewall with Advanced Security, you can define IPsec rules as part of your security policy. Typically, these rules can be organized into four main categories: Allow connection, Block connection, Allow if secure (which can specify encryption or authentication requirements), and Custom. While the interface and features can vary slightly between Windows versions, four fundamental types of rules regarding how traffic is handled are commonly supported.
Reference:
Microsoft documentation, "Windows Firewall with Advanced Security".
NEW QUESTION # 53
Which component of the IT Security Model is the highest priority in ICS/SCADA Security?
- A. Authentication
- B. Availability
- C. Confidentiality
- D. Integrity
Answer: B
Explanation:
In ICS/SCADA systems, the highest priority typically is Availability, due to the critical nature of the services and infrastructures they support. These systems often control vital processes in industries like energy, water treatment, and manufacturing. Any downtime can lead to significant disruptions, safety hazards, or economic losses. Thus, ensuring that systems are operational and accessible is a primary security focus in the context of ICS/SCADA security.
Reference:
National Institute of Standards and Technology (NIST), "Guide to Industrial Control Systems (ICS) Security".
NEW QUESTION # 54
With respect to the IEC 62443, how many steps are in the Defense in Depth process?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: C
Explanation:
IEC 62443 is a series of standards designed to secure Industrial Automation and Control Systems (IACS). It provides a framework for implementing cybersecurity measures in the context of industrial environments.
The Defense in Depth (DiD) approach outlined in IEC 62443 involves multiple layers of security measures to protect industrial networks. This method ensures that if one layer fails, others are in place to continue protection.
Specifically, the IEC 62443 framework describes six fundamental steps in setting up a Defense in Depth strategy, covering aspects from physical security to network segmentation and device hardening.
Reference
International Electrotechnical Commission, IEC 62443 Series.
"Understanding IEC 62443 for Industrial Cybersecurity," by ISA99 Committee.
The IEC 62443 standard outlines a comprehensive framework for securing industrial automation and control systems (IACS). The Defense in Depth concept within this standard includes six steps designed to ensure robust security.
Step 1: Identification and Authentication Control (IAC): Ensuring only authorized users and devices can access the system.
Step 2: Use Control (UC): Managing permissions and access controls to restrict actions users can perform.
Step 3: System Integrity (SI): Ensuring the system remains in a trustworthy state, protected from unauthorized changes.
Step 4: Data Confidentiality (DC): Protecting sensitive data from unauthorized access and disclosure.
Step 5: Restricted Data Flow (RDF): Controlling and monitoring data flows to prevent unauthorized data transmission.
Step 6: Timely Response to Events (TRE): Implementing mechanisms to detect, respond to, and recover from security incidents.
These steps collectively form the Defense in Depth strategy prescribed by IEC 62443.
Reference
"IEC 62443 - Industrial Automation and Control Systems Security," International Electrotechnical Commission, IEC 62443.
"Defense in Depth," Cybersecurity and Infrastructure Security Agency (CISA), Defense in Depth.
NEW QUESTION # 55
What is a vulnerability called that is released before a patch comes out?
- A. Pre-release
- B. Zero day
- C. Initial
- D. First
Answer: B
Explanation:
A vulnerability that is exploited before the vendor has issued a patch or even before the vulnerability is known to the vendor is referred to as a "zero-day" vulnerability. The term "zero-day" refers to the number of days the software vendor has had to address and patch the vulnerability since it was made public-zero, in this case.
Reference:
Symantec Security Response, "Zero Day Initiative".
NEW QUESTION # 56
Which of the IEC 62443 security levels is identified by a hacktivist/terrorist target?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: A
Explanation:
IEC 62443 defines multiple security levels (SLs) tailored to address different types of threats and attackers in industrial control systems.
Security Level 4 (SL4) is designed to protect against sophisticated attacks by adversaries such as hacktivists or terrorists. SL4 involves threats that are targeted with specific intent against the organization, using advanced skills and means.
This level assumes that the adversary is capable of sustained and focused efforts with significant resources, including state-level actors or well-funded groups, aiming at causing widespread disruption or damage.
Reference
IEC 62443-3-3: System security requirements and security levels.
"Industrial Network Security: Securing Critical Infrastructure Networks for Smart Grid, SCADA, and Other Industrial Control Systems," by Eric Knapp.
NEW QUESTION # 57
Which component of the IT Security Model is attacked with masquerade?
- A. Availability
- B. Authentication
- C. Confidentiality
- D. Integrity
Answer: B
Explanation:
A masquerade attack involves an attacker pretending to be an authorized user of a system, thus compromising the authentication component of the IT security model. Authentication ensures that the individuals accessing the system are who they claim to be. By masquerading as a legitimate user, an attacker can bypass this security measure and gain unauthorized access to the system.
Reference:
William Stallings, "Security in Computing".
NEW QUESTION # 58
Which of the following are NOT components of an ICS/SCADA network device?
- A. Weak network stack
- B. High bandwidth networks
- C. Legacy systems
- D. Low processing threshold
Answer: B
Explanation:
Industrial Control Systems (ICS) and SCADA networks typically operate in environments where the available bandwidth is limited. They are often characterized by:
Low processing threshold: ICS/SCADA devices generally have limited processing capabilities due to their specialized and often legacy nature.
Legacy systems: Many ICS/SCADA systems include older technology that might not support newer security protocols or high-speed data transfer.
Weak network stack: These systems may have incomplete or less robust network stacks that can be susceptible to specific types of network attacks.
High bandwidth networks are not typical of ICS/SCADA environments, as these systems do not usually require or support high-speed data transmission due to their operational requirements and the older technology often used in such environments.
Reference
"Navigating the Challenges of Industrial Control Systems," by ISA-99 Industrial Automation and Control Systems Security.
"Cybersecurity for Industrial Control Systems," by the Department of Homeland Security.
NEW QUESTION # 59
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