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  1. Home
  2. MikroTik Certification
  3. MTCNA Exam
  4. MikroTik.MTCNA.v2025-06-23.q150 Dumps
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Question 91

To block communications between wireless clients connected to the same access point interface, you should set:

Correct Answer: A
The setting default-forwarding=no prevents wireless clients from communicating with each other over the same access point interface. This enables client isolation - each device can only reach the gateway (router), not other wireless clients.
* A.#Correct - This enables client isolation by blocking inter-client communication.
* B.#Incorrect - This limits how many clients can connect, not their ability to talk to each other.
* C.#Incorrect - Prevents new clients from associating, unrelated to inter-client traffic.
* D.#Incorrect - Only default-forwarding affects client-to-client visibility.
Extract from MTCNA Course Material - Wireless Security and Isolation:
"default-forwarding=no prevents wireless clients from communicating with each other on the same AP interface." Extract from Rene Meneses Study Guide - Wireless Interface Settings:
"To isolate wireless clients, use default-forwarding=no. This ensures clients can't ping or access one another." Extract from MikroTik Wiki - Wireless Interface Options:
"default-forwarding=no stops traffic between clients. Only traffic to the AP is allowed."
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Question 92

What is the correct action to be specified in the NAT rule to hide a private network when communicating to the outside world?

Correct Answer: A
In MikroTik RouterOS, the masquerade action is used in source NAT (srcnat) rules to hide internal/private IP addresses behind a router's public IP address. This is typically done for internet access from a LAN where the devices have private IP addresses (e.g., 192.168.x.x).
Masquerade dynamically changes the source IP of outgoing packets to the IP address of the router's outbound interface, allowing multiple internal devices to share a single public IP.
Let's evaluate the options:
* A. masquerade ##Correct. Used to perform source NAT for hiding private addresses.
* B. allow ##Not a valid NAT action.
* C. passthrough ##Used in mangle rules to continue processing additional rules, not for NAT.
* D. tarpit ##Used to delay TCP connections (often in firewall, not NAT).
MTCNA Course Manual - NAT Chapter:
"Masquerade is a special form of source NAT where the router replaces the source IP with the IP address of the outgoing interface." Rene Meneses Guide - NAT Configuration:
"Use masquerade on the router's WAN interface to give internet access to private clients." Terry Combs Notes - NAT Rule Actions:
"Masquerade = dynamic src-nat. Useful when public IP is dynamic or unknown."
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Question 93

If you need to make sure that one computer in your Hot-Spot network can access the Internet without Hot-Spot authentication, which menu allows you to do this?

Correct Answer: A
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Question 94

Which of the following are valid IP addresses?

Correct Answer: B,C,D
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Question 95

To use masquerade, you need to specify:

Correct Answer: B
Masquerading is a form of source NAT (src-nat) where the router dynamically replaces the source address of outgoing packets with the IP address of the router's outgoing interface. This is commonly used when internal LAN clients access the internet through a single public IP.
Key points for masquerade configuration:
* Use chain=src-nat (because it modifies the source address)
* Use action=masquerade
* Specify the out-interface (i.e., the WAN interface)
MTCNA Course Material - NAT Section:
"To configure masquerading, use chain=src-nat and action=masquerade. Specify out-interface to define the traffic direction." Rene Meneses MTCNA Study Guide - NAT Examples:
"Masquerade automatically uses the IP address of the specified out-interface. Required parameters: chain=src- nat, action=masquerade, out-interface." MikroTik Wiki - Source NAT / Masquerade:
"Masquerade is a special form of src-nat. You must use it in chain=src-nat and define the out-interface for which NAT will be applied." Option A: Incorrect action=accept (used in filter rules, not NAT) Option C: in-interface is not applicable here Option D: chain=dst-nat is used for destination NAT, not source NAT Only Option B is fully correct.
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