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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 136

What is marked by connection-state=established matcher?

Correct Answer: A
The connection-state=established matcher in MikroTik's firewall refers to packets that are part of an already active connection. These packets are neither new nor related - they are directly associated with a known connection that has been previously accepted or initiated.
MikroTik uses Connection Tracking (enabled by default) to determine the state of each packet:
* new: Packet begins a new connection (e.g., TCP SYN)
* established: Packet belongs to a previously established connection (reply or subsequent packets)
* related: Packet is not part of the connection, but is related (e.g., FTP data channel)
* invalid: Packet that does not match any known or valid connection
Therefore:
* A.#Correct. "Established" means part of an ongoing, known connection.
* B.#This describes "related"
* C.#This describes "invalid"
* D.#This describes "new"
MTCNA Course Manual - Firewall and Connection Tracking:
"Established - Packet that belongs to an existing connection. This includes replies and ongoing streams." Rene Meneses Study Guide - Firewall Fundamentals:
"Use connection-state=established to allow traffic that is part of previously accepted sessions." Terry Combs Notes - Connection States:
"Established = trusted, ongoing session. Essential for return traffic."
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Question 137

If you use either Telnet or FTP, which is the highest layer you are using to transmit data?

Correct Answer: A
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Question 138

Which of the following keystrokes enables safe mode in console?

Correct Answer: D
Safe Mode in MikroTik CLI is a protective mode that helps revert any unintended changes if you get disconnected. It is activated by pressing Ctrl+X in older versions, but the current standard keybinding for enabling safe mode is Ctrl+S.
MTCNA Course Material - Safe Mode:
"To enable safe mode in the terminal, press Ctrl+S. A confirmation [Safe Mode] will appear in the prompt. If the terminal is closed or disconnected, the changes are rolled back." Rene Meneses MTCNA Study Guide - Terminal Commands:
"Safe Mode can be activated using Ctrl+S. This is useful during remote configuration. It reverts changes if the terminal is closed." MikroTik Wiki - Safe Mode Section:
"To enter safe mode, press Ctrl+S in CLI. This ensures configuration rollback if disconnected." Other options:
* Ctrl+C terminates commands or CLI input
* Ctrl+X may not activate safe mode in newer versions
* Ctrl+D is used to log out in some Unix-like terminals
Correct answer: Ctrl+S
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Question 139

How many usable IP addresses are there in a 20-bit subnet?

Correct Answer: D
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Question 140

Which command is used to upgrade an IOS on a Cisco router?

Correct Answer: D
To upgrade or install a new Cisco IOS image on a router, you typically copy the IOS image file from a TFTP server into the router's flash memory. The correct syntax is:
copy tftp flash
This command tells the router to copy the IOS image from a TFTP server into flash storage, where it can be booted.
Cisco IOS Documentation - Image Upgrade Process:
"Use the command copy tftp flash to transfer an IOS image from a TFTP server to the router's flash memory." Other options:
* A: copy tftp run - invalid; you cannot copy into the running-config that way
* B: copy tftp start - used to copy configuration, not IOS image
* C: config net - an older and deprecated command, not for IOS upgrades Final answer:
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