MikroTik Updated MTCNA Exam Questions and Answers by sierra

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.”

René 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.”

Answer: AQUESTION NO: 62 [PPP / AAA]

Router A and B are both running as PPPoE servers on different broadcast domains of your network. It is possible to set Router A to use "/ppp secret" accounts from Router B to authenticate PPPoE customers.

A. true

B. false

Answer: B

/ppp secret accounts are local to each RouterOS device. These credentials are stored in the router’s own configuration and cannot be shared directly between routers.

To centralize authentication across multiple routers, a RADIUS server must be used. With RADIUS, multiple MikroTik routers can authenticate users against a single, centralized user database.

Without RADIUS or another external AAA system:

Each router maintains its own /ppp secret list

Router A cannot directly read or use the /ppp secrets from Router B

Evaluation:

A.❌False. There is no built-in mechanism for Router A to access secrets on Router B.

B.✅Correct. You must use RADIUS if you want shared authentication across routers.

MTCNA PPP Module – Authentication Methods:

“/ppp secrets are stored locally on the router. For shared user authentication, configure RADIUS.”

René Meneses Study Guide – PPPoE and RADIUS:

“To authenticate clients on multiple routers with a central database, RADIUS is required.”

Terry Combs Notes – PPP Secrets vs RADIUS:

“Local secrets cannot be accessed remotely. Use RADIUS to centralize authentication.”

Answer: B

To establish a wireless client connection to an access point:

The SSID must match exactly – including capitalization.

The Band must be compatible – i.e., both devices must support and use the same frequency band (2.4GHz or 5GHz).

Radio Name is an identifier for display purposes only and does not affect connectivity.

Option Analysis:

A.✔Required – Matching SSID is essential.

B.✘Not Required – Radio Name is just a display label in tools like Winbox.

C.✔Required – Band compatibility is critical to ensure the device can “see” and connect to the AP.

Extract from Official MTCNA Course Material – Wireless Client Configuration:

“To connect to an AP, the client must use the same SSID and operate on a compatible band and frequency.”

Extract from René Meneses MTCNA Study Guide – Wireless Modes:

“SSID and band must match to connect. Radio name is not used in the authentication or association process.”

Extract from Terry Combs Notes – Wireless Settings:

“SSID is like the network name, and it must be identical. Mismatched bands (e.g., 2.4 vs 5GHz) will prevent discovery.”

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The OSI (Open Systems Interconnection) model was developed by the ISO (International Standards Organization) to provide a universal standard for network communications. Its primary goal is to enable interoperability between different systems and vendors by establishing a common networking framework.

MTCNA Course Material – OSI Model Purpose:

“The OSI model helps standardize networking so that different systems and networks can communicate.”

René Meneses MTCNA Study Guide – OSI Principles:

“The model was designed to guide product developers and facilitate communication between heterogeneous network systems.”

Other options:

A: The OSI was not intended to be “larger” than DoD model

B: Helpful benefit, but not the main reason for creation

D: Incorrect and vendor-specific (not factual)

Final Answer: CQUESTION NO: 126 [Networking Fundamentals – VLAN Concepts]

What does a VLAN do?

A. Acts as the fastest port to all servers.

B. Provides multiple collision domains on one switch port.

C. Breaks up broadcast domains in a layer 2 switch internetwork.

D. Provides multiple broadcast domains within a single collision domain.

Answer: C

VLANs (Virtual Local Area Networks) segment a Layer 2 switch network into separate broadcast domains. Without VLANs, all devices on a switch share a single broadcast domain. VLANs allow traffic isolation by logically grouping ports, improving security and performance.

MTCNA Course Material – VLAN Fundamentals:

“VLANs allow you to logically segment a switch network. Each VLAN creates a separate broadcast domain.”

René Meneses MTCNA Study Guide – VLAN Behavior:

“Switches normally operate in a single broadcast domain. VLANs break this up without requiring physical segmentation.”

Breakdown:

A: Not related to VLAN function

B: Switch ports are already separate collision domains

D: Reverse of what VLANs actually do

Final Answer: CQUESTION NO: 127 [VLAN Management – VTP and Cisco Switching]

Which one of the following is true regarding VLANs?

A. Two VLANs are configured by default on all Cisco switches.

B. VLANs only work if you have a complete Cisco switched internetwork. No off-brand switches are allowed.

C. You should not have more than 10 switches in the same VTP domain.

D. VTP is used to send VLAN information to switches in a configured VTP domain.

Answer: D

VTP (VLAN Trunking Protocol) is a Cisco proprietary protocol used to manage and propagate VLAN information throughout a switch fabric. It helps maintain consistency across switches by distributing VLAN configurations from a VTP server to client switches in the same domain.

Cisco Switching Guide – VTP Concepts:

“VTP advertises VLAN definitions on a LAN to ensure consistency. It reduces misconfigurations by centralizing VLAN management.”

René Meneses MTCNA Study Guide – VLAN and VTP Notes:

“VTP sends VLAN updates across switches in the same VTP domain. Switches must be compatible and share the domain name.”

Breakdown:

A: Only VLAN 1 exists by default

B: VLANs are not Cisco-exclusive

C: There is no limit of 10 switches in a VTP domain

D:✔Correct

Final Answer: DQUESTION NO: 128 [RouterOS]

If your router is facilitating a CSU/DSU, which of the following commands do you need to use to provide the router with a 64000bps serial link?

A. RouterA(config)#bandwidth 64

B. RouterA(config-if)#bandwidth 64000

C. RouterA(config-if)#clock rate 64

D. RouterA(config-if)#clock rate 64000

Answer: D

In Cisco IOS, the clock rate command is used on the DCE (Data Communications Equipment) end of a serial link to provide timing to the connected DTE (Data Terminal Equipment) device. To configure a 64 kbps link, the correct syntax is:

RouterA(config-if)#clock rate 64000

Cisco IOS Configuration Guide – Serial Interfaces:

“When the router acts as DCE, use the command clock rate [bps] under the serial interface to set the speed. For 64kbps, use 64000.”

René Meneses MTCNA Guide – WAN Configuration (Cisco Compatibility):

“Use clock rate 64000 for CSU/DSU simulation. Bandwidth command is for routing metrics only.”

Option analysis:

A: bandwidth 64 → Sets routing metric, not actual interface speed

B: bandwidth 64000 → Same; metric only

C: clock rate 64 → Incorrect value

D:✔Correct and syntactically valid

Final Answer: D────────────────────────────────────────────────────────────

In MikroTik queues (especially in simple queues), the "total" limit typically refers to the combined rate of upload and download traffic — i.e., the total bandwidth usage. This is useful when you want to control the full traffic flow for a client or subnet.

A.✘Incorrect – Not just download

B.✔Correct – Total = Download + Upload combined

C.✘Incorrect

D.✘Incorrect – Upload alone is not referred to as "total"

Extract from MTCNA Course Material – Simple Queues:

“The total max-limit or total rate represents both upload and download combined.”

Extract from René Meneses MTCNA Study Guide – Queue Types:

“Use total max-limit to limit overall bandwidth. Individual directions can also be configured.”

Extract from MikroTik Wiki – Simple Queue Options:

“total-max-limit defines the sum of incoming and outgoing traffic rates.”