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MikroTik Certification
MTCNA Exam
MikroTik.MTCNA.v2025-06-23.q150 Dumps

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Question 121

Which of these are possible solutions to bridge two networks over a wireless link:

A.Both devices in AP mode and enable WDS mode
B.One device in AP mode, another one in station-pseudobridge-clone
C.One device in AP mode, another one in station-pseudobridge
D.One device in AP mode, another one in station

Correct Answer: A,B,C

To bridge two networks over a wireless link (i.e., perform Layer 2 bridging), MikroTik offers several wireless modes that support bridging:
* WDS (Wireless Distribution System) is MikroTik's mechanism to forward Layer 2 frames over wireless
* pseudobridge and pseudobridge-clone attempt to mimic Layer 2 bridging, with some limitations Option analysis:
* A.#Correct-Using AP mode on both ends and enabling WDS allows full Layer 2 bridging
* B.#Correct-pseudobridge-clone allows limited bridging by spoofing the MAC address of the connected host
* C.#Correct-station-pseudobridge enables partial bridging (one client per MAC)
* D.#Incorrect-station mode alone does not support Layer 2 bridging; it performs routing/NAT instead Extract from MTCNA Course Material - Bridging and Wireless Section:
"To bridge over wireless, you can use WDS or station-pseudobridge(-clone). WDS provides true Layer 2 bridging, while pseudobridge methods simulate it for single hosts." Extract from Rene Meneses Study Guide - Wireless Bridging:
"WDS is most reliable for bridging. pseudobridge and pseudobridge-clone work with one client and should be used cautiously." Extract from Terry Combs Notes - Wireless Bridging:
"station mode alone is not sufficient for bridging. Use WDS or pseudobridge options."

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Question 122

NAT rule is going to catch SMTP traffic and send it to a specific mail server.
What is the correct action for a NAT rule?

A.passthrough
B.redirect
C.tarpit
D.dst-nat

Correct Answer: D

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Question 123

If ARP=reply-only is configured on an interface, this interface will:

A.accept all MAC-addresses listed in '/ip arp' as static entries
B.accept IP and MAC address combinations listed in '/ip arp' list
C.add new MAC addresses in '/ip arp' list
D.add new IP addresses in '/ip arp' list
E.accept all IP addresses listed in '/ip arp' as static entries

Correct Answer: B

When ARP is set to reply-only on a MikroTik interface, the router will not respond to any ARP requests unless a matching static entry exists in the /ip arp list. It will also not learn new dynamic entries - only pre- defined static IP-MAC pairs will be accepted and responded to.
Option breakdown:
* A.#Incorrect - The router doesn't operate solely based on MAC, but on IP-MAC pairings.
* B.#Correct - Only combinations that match entries in /ip arp are accepted.
* C.#Incorrect - reply-only mode disables dynamic ARP learning.
* D.#Incorrect - Again, no new IPs are dynamically added.
* E.#Incorrect - Static ARP is enforced by IP-MAC pairs, not just IP.
Extract from MTCNA Course Material - ARP Modes:
"Reply-only mode will respond to ARP requests only if a matching static ARP entry exists. No dynamic learning occurs." Extract from Rene Meneses Study Guide - ARP Explanation:
"Use ARP=reply-only to force strict IP-MAC pairing. It prevents spoofing but requires all valid pairs to be preconfigured." Extract from MikroTik Wiki - ARP Settings:
"reply-only: Only respond to ARP requests if the requester matches a static /ip arp entry. New dynamic entries are not created."

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Question 124

When sending out an ARP request, an IP host is expecting what kind of address for an answer?

A.802.11g
B.VLAN ID
C.MAC Address
D.IP address

Correct Answer: C

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Question 125

In which situations can Netinstall NOT be used to install a RouterBOARD?

A.The router does not have an operating system
B.The router is connected only to a wireless network
C.You do not know the password of the router
D.The router is connected only to a secondary Ethernet port

Correct Answer: B

Netinstall works over a wired Ethernet connection and uses PXE or Etherboot to install RouterOS over the network. It cannot function over wireless, as wireless interfaces do not support PXE booting or Netinstall protocols.
MTCNA Course Material - Netinstall Overview:
"Netinstall requires a direct Ethernet connection between the PC and the router. Wireless interfaces are not supported for Netinstall procedures." Rene Meneses MTCNA Guide - Netinstall:
"Netinstall only works over Ethernet. You cannot Netinstall a device connected only through Wi-Fi." MikroTik Wiki - Netinstall Prerequisites:
"Router must be connected via Ethernet. Wireless and USB interfaces are not supported." Other options:
* A: This is a typical use case (installing RouterOS when OS is missing)
* C: Netinstall bypasses password (not needed)
* D: Netinstall can work via any Ethernet port, provided it's accessible Final answer: B

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