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CPEH-001 PDF DEMO:

QUESTION NO: 1
Doug is conducting a port scan of a target network. He knows that his client target network has a web server and that there is a mail server also which is up and running. Doug has been sweeping the network but has not been able to elicit any response from the remote target. Which of the following could be the most likely cause behind this lack of response? Select 4.
A. The TCP windows size does not match
B. UDP is filtered by a gateway
C. ICMP is filtered by a gateway
D. The packet TTL value is too low and cannot reach the target
E. The host might be down
F. The destination network might be down
Answer: B,C,D,E
Explanation:
If the destination host or the destination network is down there is no way to get an answer and if TTL
(Time To Live) is set too low the UDP packets will "die" before reaching the host because of too many hops between the scanning computer and the target. The TCP receive window size is the amount of received data (in bytes) that can be buffered during a connection. The sending host can send only that amount of data before it must wait for an acknowledgment and window update from the receiving host and ICMP is mainly used for echo requests and not in port scans.

QUESTION NO: 2
Which Type of scan sends a packets with no flags set? Select the Answer
A. Null Scan
B. Half-Open Scan
C. Open Scan
D. Xmas Scan
Answer: A
Explanation:
The types of port connections supported are:
* TCP Full Connect. This mode makes a full connection to the target's TCP ports and can save any data or banners returned from the target. This mode is the most accurate for determining TCP services, but it is also easily recognized by Intrusion Detection Systems (IDS).
* UDP ICMP Port Unreachable Connect. This mode sends a short UDP packet to the target's UDP ports and looks for an ICMP Port Unreachable message in return. The absence of that message indicates either the port is used, or the target does not return the ICMP message which can lead to false positives. It can save any data or banners returned from the target. This mode is also easily recognized by IDS.
* TCP Full/UDP ICMP Combined. This mode combines the previous two modes into one operation.
* TCP SYN Half Open. (Windows XP/2000 only) This mode sends out a SYN packet to the target port and listens for the appropriate response. Open ports respond with a SYN|ACK and closed ports respond with ACK|RST or RST. This mode is less likely to be noted by IDS, but since the connection is never fully completed, it cannot gather data or banner information. However, the attacker has full control over TTL, Source Port, MTU, Sequence number, and Window parameters in the SYN packet.
* TCP Other. (Windows XP/2000 only) This mode sends out a TCP packet with any combination of the
SYN, FIN, ACK, RST, PSH, URG flags set to the target port and listens for the response. Again, the attacker can have full control over TTL, Source Port, MTU, Sequence number, and Window parameters in the custom TCP packet. The Analyze feature helps with analyzing the response based on the flag settings chosen. Each operating system responds differently to these special combinations. The tool includes presets for XMAS, NULL, FIN and ACK flag settings.

QUESTION NO: 3
A penetration tester is attempting to scan an internal corporate network from the internet without alerting the border sensor. Which is the most efficient technique should the tester consider using?
A. Tunneling scan over SSH
B. Scanning using fragmented IP packets
C. Tunneling over high port numbers
D. Spoofing an IP address
Answer: A

QUESTION NO: 4
One of your team members has asked you to analyze the following SOA record. What is the version?
Rutgers.edu.SOA NS1.Rutgers.edu ipad.college.edu (200302028 3600
3600 604800 2400.
A. 200303028
B. 2400
C. 4800
D. 604800
E. 60
F. 3600
Answer: A
Explanation:
The SOA starts with the format of YYYYMMDDVV where VV is the version.

QUESTION NO: 5
Jayden is a network administrator for her company. Jayden wants to prevent MAC spoofing on all the Cisco switches in the network. How can she accomplish this?
A. Jayden can use the commanD. ip binding set.
B. She should use the commanD. no dhcp spoofing.
C. Jayden can use the commanD. no ip spoofing.
D. She can use the comman ip dhcp snooping binding.
Answer: D

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Updated: May 27, 2022