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MikroTik Certification
MTCNA Exam
MikroTik.MTCNA.v2026-01-06.q150 Dumps

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Question 21

Which class of IP address has the most host addresses available by default?

A.A
B.B
C.C
D.A and B

Correct Answer: A

Classful IP addressing reserves different address ranges and host counts:
* Class A: 1.0.0.0 - 126.255.255.255 (/8) # 2^24 - 2 = 16,777,214 hosts
* Class B: 128.0.0.0 - 191.255.255.255 (/16) # 2^16 - 2 = 65,534 hosts
* Class C: 192.0.0.0 - 223.255.255.255 (/24) # 2^8 - 2 = 254 hosts
MTCNA Course Material - IP Address Classes:
"Class A has the largest number of hosts per network, over 16 million. Class B allows around 65,000, and Class C allows 254." Rene Meneses MTCNA Study Guide - Classful IP Summary:
"Class A provides the most host addresses by default due to its /8 subnet." Only Class A has the highest host count.

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Question 22

Which command is used to determine if an IP access list is enabled on a particular interface?

A.show ip interface
B.show interface access-lists
C.show interface
D.show access-lists

Correct Answer: C

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Question 23

If you wish to block user access to MSN messenger, which chain should the firewall rule be placed in?

A.input
B.process
C.forward
D.output

Correct Answer: C

In MikroTik's firewall, the correct chain depends on the traffic direction and whether the traffic is destined for or originating from the router itself.
To block access to MSN (or any other service being accessed by a user from the LAN to the Internet), you must filter transit traffic. This is done in the forward chain.
* A. input # Used for traffic destined to the router (e.g., WinBox, SSH).
* B.#process # Invalid option (does not exist in RouterOS).
* C.#forward # Used for user traffic passing through the router (e.g., LAN client to MSN servers on the Internet).
* D. output # Used for traffic originating from the router itself (e.g., ping from router to external IP).
Extract from Official MTCNA Course Material - Firewall Chains:
"Use the forward chain to filter traffic passing through the router (LAN to WAN). Blocking access to external services like Facebook or MSN belongs here." Extract from Rene Meneses MTCNA Study Guide - Firewall Chains:
"To block Internet services for users, configure rules in the forward chain. Input is only for traffic targeting the router." Extract from MikroTik Wiki - Firewall Overview:
"forward: filters all traffic going through the router. For user access restrictions, place rules here."

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Question 24

Bridging loops can be avoided by enabling:

A.ICMP filter
B.UDP filter
C.Connection tracking
D.RSTP protocol
E.STP protocol

Correct Answer: D,E

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Question 25

How long is level 1 (demo) license valid?

A.24 hours
B.Infinite time
C.1 month
D.1 year

Correct Answer: B

RouterOS Level 1 license is the demo license that comes with all RouterOS installations (particularly on x86 or CHR before activation). It is unrestricted in time, meaning it never expires, but functionality is extremely limited.
* A. 24 hours # Incorrect. There is no such time-limited restriction.
* B. Infinite time # Correct. Level 1 license is perpetual but has limited features.
* C. 1 month # Incorrect. MikroTik does not impose monthly timeouts on license levels.
* D. 1 year # Incorrect. No temporary time-bound license is assigned by default.
Extract from Official MTCNA Course Material - Licensing Section:
"Level 1 (demo) license is unlimited in time but has very limited functionality. It is designed for testing purposes only." Extract from Rene Meneses MTCNA Study Guide - RouterOS Licensing:
"The Level 1 license is not time-limited, but it cannot be used in production due to its lack of key features." Extract from MikroTik Wiki - Licensing Model:
"License level 1 is a free demo license that does not expire."

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