MTCNA Exam Dumps : MikroTikCertified Network Associate Exam

DNS primarily uses UDP port 53 for most query/response operations. However, TCP port 53 is also used, particularly for larger responses (such as DNS zone transfers or DNSSEC).

A.✔UDP – Used for standard DNS queries due to lower overhead.

B.✔TCP port 53 – Used when UDP is insufficient, especially for zone transfers (AXFR/IXFR).

Extract from MTCNA Course Material – DNS and Networking Services:

“DNS typically uses UDP/53, but falls back to TCP/53 for larger queries or zone transfers.”

Extract from MikroTik Wiki – DNS Settings:

“DNS uses UDP for general queries. TCP is used when UDP cannot accommodate the size of the response.”

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TTL (Time to Live) is a field in the IP header that limits the number of hops a packet can travel. Each router that processes the packet decrements the TTL by 1. When TTL reaches 0, the packet is dropped.

Default TTL values vary by operating system, but in RouterOS and many Linux-based systems, the default TTL is 64.

A. 60 → Incorrect, used in some systems but not the MikroTik default

B. 30 → Incorrect

C. 1 → Incorrect; would allow only one hop

D. 64 →✔Correct

Extract from Official MTCNA Course Material – TTL Field Explanation:

"The default TTL in RouterOS and most Unix-like systems is 64. Each router decrements this by 1 until the packet is discarded."

Extract from René Meneses Study Guide – IP Protocol Details:

“TTL is initialized to 64 by default in MikroTik RouterOS.”

Extract from MikroTik Wiki – IP Protocol Section:

"RouterOS sets default TTL of 64 unless manually configured otherwise."

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To configure a MikroTik wireless interface as a basic access point (AP), the minimum required parameters are:

Mode → Must be set to ap-bridge or bridge

SSID → Defines the wireless network name to broadcast

Band → Determines which frequency ranges are used (e.g., 2.4GHz b/g/n or 5GHz a/n/ac)

Frequency → Specifies the actual channel used for broadcasting

Options reviewed:

A. radio name →✘Optional. A cosmetic label used to identify the radio in Winbox.

B. scan-list →✘Optional. Used to define which frequencies the interface should scan.

C.✔Required

D.✔Required

E.✔Required

F. DFS mode →✘Optional and auto-configured based on regulatory domain.

G. WDS →✘Only needed for bridging or extending networks.

Extract from Official MTCNA Course Material – Wireless Configuration:

“The minimal settings to enable an Access Point include: mode, SSID, band, and frequency. Without these, the interface won’t broadcast.”

Extract from René Meneses Study Guide – Wireless Basics:

“To turn on an AP: Set the mode to ap-bridge, define SSID, band, and frequency. Other settings are optional or advanced.”

Extract from Terry Combs Notes – Wireless Setup:

“Essential: mode, frequency, SSID, band. Others like WDS and DFS are situational.”

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