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The network administrator at Spears Technology, Inc has configured the default gateway Cisco router's access- list as below:
You are hired to conduct security testing on their network.
You successfully brute-force the SNMP community string using a SNMP crack tool.
The access-list configured at the router prevents you from establishing a successful connection.
You want to retrieve the Cisco configuration from the router. How would you proceed?
A. Send a customized SNMP set request with a spoofed source IP address in the range -192.168.1.0
B. Use the Cisco's TFTP default password to connect and download the configuration file
C. Run Generic Routing Encapsulation (GRE) tunneling protocol from your computer to the router masking your IP address
D. Run a network sniffer and capture the returned traffic with the configuration file from the router
Answer: A,D
NEW QUESTION # 312
A penetration tester was assigned to scan a large network range to find live hosts. The network is known for using strict TCP filtering rules on its firewall, which may obstruct common host discovery techniques. The tester needs a method that can bypass these firewall restrictions and accurately identify live systems. What host discovery technique should the tester use?
A. UDP Ping Scan
B. TCP SYN Ping Scan
C. ICMP Timestamp Ping Scan
D. lCMP ECHO Ping Scan
Answer: B
Explanation:
The host discovery technique that the tester should use is TCP SYN Ping Scan. This technique sends a TCP SYN packet to a specified port on the target host and waits for a response. If the host responds with a TCP SYN/ACK packet, it means the host is alive and the port is open. If the host responds with a TCP RST packet, it means the host is alive but the port is closed. If the host does not respond at all, it means the host is either dead or filtered by a firewall12. TCP SYN Ping Scan can bypass firewall restrictions because it mimics the initial stage of a TCP three-way handshake, which is a common and legitimate network activity. Therefore, most firewalls will allow TCP SYN packets to pass through and reach the target host, unless they are configured to block specific ports or IP addresses3. TCP SYN Ping Scan can also accurately identify live systems because it does not rely on ICMP, which may be blocked or rate-limited by some firewalls or routers.
The other options are not as effective or feasible as TCP SYN Ping Scan for the following reasons:
* A. UDP Ping Scan: This technique sends a UDP packet to a specified port on the target host and waits for a response. If the host responds with an ICMP Port Unreachable message, it means the host is alive but the port is closed. If the host does not respond at all, it means the host is either dead, the port is open, or the packet is filtered by a firewall12. UDP Ping Scan may not bypass firewall restrictions because some firewalls may block or drop UDP packets, especially if they are sent to uncommon or reserved ports. UDP Ping Scan may also not accurately identify live systems because it cannot distinguish between open ports and filtered packets, and it may generate false positives or negatives due to packet loss or rate-limiting.
* B. ICMP ECHO Ping Scan: This technique sends an ICMP ECHO Request packet to the target host and waits for an ICMP ECHO Reply packet. If the host responds with an ICMP ECHO Reply packet, it means the host is alive. If the host does not respond at all, it means the host is either dead or filtered by a firewall12. ICMP ECHO Ping Scan may not bypass firewall restrictions because some firewalls may block or drop ICMP packets, especially if they are sent to prevent ping sweeps or denial-of-service attacks. ICMP ECHO Ping Scan may also not accurately identify live systems because it may generate false positives or negatives due to packet loss or rate-limiting.
* C. ICMP Timestamp Ping Scan: This technique sends an ICMP Timestamp Request packet to the target host and waits for an ICMP Timestamp Reply packet. If the host responds with an ICMP Timestamp Reply packet, it means the host is alive. If the host does not respond at all, it means the host is either dead or filtered by a firewall12. ICMP Timestamp Ping Scan may not bypass firewall restrictions because some firewalls may block or drop ICMP packets, especially if they are sent to prevent ping sweeps or denial-of-service attacks. ICMP Timestamp Ping Scan may also not accurately identify live systems because it may generate false positives or negatives due to packet loss or rate-limiting.
References:
* 1: Host Discovery in Nmap Network Scanning - GeeksforGeeks
* 2: nmap Host Discovery Techniques
* 3: TCP SYN Ping Scan - Nmap
* : Ping Sweep - an overview | ScienceDirect Topics
* : UDP Ping Scan - Nmap
* : UDP Ping Scan - an overview | ScienceDirect Topics
* : ICMP Ping Scan - Nmap
* : ICMP Ping Scan - an overview | ScienceDirect Topics
NEW QUESTION # 313
While analyzing logs, you observe a large number of TCP SYN packets sent to various ports with no corresponding ACKs. What scanning technique was likely used?
A. XMAS scan
B. SYN/ACK scan
C. TCP Connect scan
D. SYN scan (half-open scanning)
Answer: D
Explanation:
This activity clearly indicates a TCP SYN scan, also known as a half-open scan, which is a commonly used stealth scanning technique discussed in CEH v13 Reconnaissance and Network Scanning. In a SYN scan, the attacker sends TCP SYN packets to target ports and observes the responses without completing the TCP three-way handshake.
If the port is open, the target responds with a SYN/ACK packet. The scanner then immediately sends a RST packet instead of the final ACK, leaving the connection half-open. This behavior allows attackers to identify open ports while minimizing log entries and reducing detection by security monitoring tools.
The absence of ACK packets in logs supports this explanation, as the handshake is never completed.
Other options are incorrect because:
* XMAS scans send packets with multiple flags set.
* SYN/ACK scans are primarily used for firewall rule discovery.
* TCP Connect scans complete the full handshake and generate ACKs.
CEH v13 emphasizes that SYN scans are widely used because they balance accuracy and stealth, making them a preferred reconnaissance method for attackers.
NEW QUESTION # 314
An organization is performing a vulnerability assessment tor mitigating threats. James, a pen tester, scanned the organization by building an inventory of the protocols found on the organization's machines to detect which ports are attached to services such as an email server, a web server or a database server. After identifying the services, he selected the vulnerabilities on each machine and started executing only the relevant tests. What is the type of vulnerability assessment solution that James employed in the above scenario?
A. Tree-based assessment
B. Service-based solutions
C. Product-based solutions
D. inference-based assessment
Answer: D
Explanation:
In an inference-based assessment, scanning starts by building an inventory of the protocols found on the machine. After finding a protocol, the scanning process starts to detect which ports are attached to services, such as an email server, web server, or database server. After finding services, it selects vulnerabilities on each machine and starts to execute only those relevant tests.
NEW QUESTION # 315
What two conditions must a digital signature meet?
A. Has to be legible and neat.
B. Has to be unforgeable, and has to be authentic.
C. Must be unique and have special characters.
D. Has to be the same number of characters as a physical signature and must be unique.
Answer: B
NEW QUESTION # 316
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