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Certified Network Defender Questions 156–160 (page: 33)

Updated On: 10-Feb-2026

Which of the following statements are true about an IPv6 network? Each correct answer represents a complete solution. Choose all that apply.

  1. For interoperability, IPv4 addresses use the last 32 bits of IPv6 addresses.
  2. It increases the number of available IP addresses.
  3. It uses longer subnet masks than those used in IPv4.
  4. It provides improved authentication and security.
  5. It uses 128-bit addresses.

Answer(s): A,B,D,E

Explanation:

IP addressing version 6 (IPv6) is the latest version of IP addressing. IPv6 is designed to solve many of the problems that were faced by IPv4, such as address depletion, security, auto-configuration, and extensibility. With the fast increasing number of networks and the expansion of the World Wide Web, the allotted IP addresses are depleting rapidly, and the need for more network addresses is arising. IPv6 solves this problem, as it uses a 128-bit address that can produce a lot more IP addresses. These addresses are hexadecimal numbers, made up of eight octet pairs. An example of an IPv6 address is 45CF: 6D53: 12CD: AFC7: E654: BB32: 543C: FACE.
Answer option C is incorrect. The subnet masks used in IPv6 addresses are of the same length as those used in IPv4 addresses.



Which of the following transmission modes of communication is one-way?

  1. Half duplex
  2. full-duplex mode
  3. #NAME?
  4. root mode
  5. None

Answer(s): A



Which of the following is designed to detect unwanted changes by observing the flame of the environment associated with combustion?

  1. Fire extinguishing system
  2. None
  3. Gaseous fire-extinguishing systems
  4. sprinkler
  5. Smoke alarm system

Answer(s): E



Which of the following features is used to generate spam on the Internet by spammers and worms?

  1. AutoComplete
  2. SMTP relay
  3. Server Message Block (SMB) signing
  4. AutoFill

Answer(s): B

Explanation:

SMTP relay feature of e-mail servers allows them to forward e-mail to other e-mail servers. Unfortunately, this feature is exploited by spammers and worms to generate spam on the Internet.



Which of the following tools is described below? It is a set of tools that are used for sniffing passwords, e-mail, and HTTP traffic. Some of its tools include arpredirect, macof, tcpkill, tcpnice, filesnarf, and mailsnarf. It is highly effective for sniffing both switched and shared networks. It uses the arpredirect and macof tools for switching across switched networks. It can also be used to capture authentication information for FTP, telnet, SMTP, HTTP, POP, NNTP, IMAP, etc.

  1. Dsniff
  2. Cain
  3. Libnids
  4. LIDS

Answer(s): A

Explanation:

Dsniff is a set of tools that are used for sniffing passwords, e-mail, and HTTP traffic. Some of the tools of Dsniff include dsniff, arpredirect, macof, tcpkill, tcpnice, filesnarf, and mailsnarf. Dsniff is highly effective for sniffing both switched and shared networks. It uses the arpredirect and macof tools for switching across switched networks. It can also be used to capture authentication information for FTP, telnet, SMTP, HTTP, POP, NNTP, IMAP, etc.
Answer option B is incorrect. Cain is a multipurpose tool that can be used to perform many tasks such as Windows password cracking, Windows enumeration, and VoIP session sniffing. This password cracking program can perform the following types of password cracking attacks:
Dictionary attack Brute force attack Rainbow attack Hybrid attack
Answer options D and C are incorrect. These tools are port scan detection tools that are used in the Linux operating system.



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