EC-Council 312-50 Exam Questions
Ethical Hacker Certified (Page 22 )

Updated On: 17-Feb-2026

Which Type of scan sends a packets with no flags set ? Select the Answer

  1. Open Scan
  2. Null Scan
  3. Xmas Scan
  4. Half-Open Scan

Answer(s): B

Explanation:

The types of port connections supported are:



While doing fast scan using –F option, which file is used to list the range of ports to scan by nmap?

  1. services
  2. nmap-services
  3. protocols
  4. ports

Answer(s): B

Explanation:

Nmap uses the nmap-services file to provide additional port detail for almost every scanning method. Every time a port is referenced, it's compared to an available description in this support file. If the nmap-services file isn't available, nmap reverts to the /etc/services file applicable for the current operating system.



Bob is a Junior Administrator at ABC.com is searching the port number of POP3 in a file. The partial output of the file is look like:


In which file he is searching?

  1. services
  2. protocols
  3. hosts
  4. resolve.conf

Answer(s): A

Explanation:

The port numbers on which certain standard services are offered are defined in the RFC 1700 Assigned Numbers. The /etc/services file enables server and client programs to convert service names to these numbers -ports. The list is kept on each host and it is stored in the file
/etc/services.



Exhibit:

Please study the exhibit carefully.
Which Protocol maintains the communication on that way?

  1. UDP
  2. IP
  3. TCP
  4. ARP
  5. RARP

Answer(s): C

Explanation:

A TCP connection is always initiated with the 3-way handshake, which establishes and negotiates the actual connection over which data will be sent.



What are the four steps is used by nmap scanning?

  1. DNS Lookup
  2. ICMP Message
  3. Ping
  4. Reverse DNS lookup
  5. TCP three way handshake
  6. The Actual nmap scan

Answer(s): A,C,D,F

Explanation:

Nmap performs four steps during a normal device scan. Some of these steps can be modified or disabled using options on the nmap command line.






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