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MikroTik Certification
MTCNA Exam
MikroTik.MTCNA.v2026-01-06.q150 Dumps

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Question 111

Which firewall chain should you use to filter clients' HTTP traffic going through the router?

A.prerouting
B.forward
C.output
D.input

Correct Answer: B

When a router forwards traffic between two interfaces (such as from LAN to WAN), it uses the forward chain. HTTP traffic initiated by users destined to external servers passes through this chain.
* A.#prerouting - Used mainly for routing decisions and NAT, not filtering.
* B.#forward - Used to filter transit traffic.
* C.#output - For traffic originating from the router itself.
* D.#input - For traffic destined to the router itself.
Extract from MTCNA Course Material - Firewall Chains:
"Client-to-server traffic, like browsing the web, passes through the forward chain when routed through the router." Extract from Rene Meneses Study Guide - Firewall Structure:
"To block or allow traffic passing through the router (LAN to Internet), use the forward chain." Extract from MikroTik Wiki - Firewall Filtering Overview:
"forward: filters all transit traffic routed through the router."

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Question 112

RouterOS log messages are stored on disk by default

A.False
B.True

Correct Answer: A

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Question 113

PPP Secrets are used for

A.PPtP clients
B.Router users
C.PPPoE clients
D.IPSec clients
E.L2TP clients
F.PPP clients

Correct Answer: A,C,E

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Question 114

Which of the following is true for connection tracking?

A.Connection tracking must be enabled for NAT'ed network
B.Enabling connection tracking reduces CPU usage in RouterOS
C.Disable connection tracking for mangle to work
D.Connection tracking must be enabled to be able to use all firewall features

Correct Answer: D

Connection tracking (conntrack) is a feature that enables RouterOS to monitor and manage the state of all network connections passing through the router. It is essential for features like NAT, stateful firewalling, and proper use of mangle and filter rules.
MTCNA Course Material - Connection Tracking:
"Most firewall and NAT functionality depends on connection tracking being enabled. Without connection tracking, many features (like NAT) won't function properly." Rene Meneses MTCNA Study Guide - Firewall Section:
"Connection tracking is required for NAT and most firewall filters. When disabled, connection-state-based filtering or NAT is not possible." Terry Combs MTCNA Notes - Conntrack Section:
"Conntrack must be enabled to use full firewall capabilities, including NAT and filtering by connection states like established and related." Option A is partially true but not complete.
Option B is incorrect - conntrack may increase CPU load due to session tracking.
Option C is incorrect - mangle rules often depend on connection marks which require conntrack.
Only Option D accurately captures the critical requirement of connection tracking.

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Question 115

For a Simple Queue to apply bandwidth restrictions on a bridged interface, the following must be done:

A.Configure an IP address on the bridge interface
B.Use mangle to mark the connections
C.Associate the Simple Queue to the bridge interface
D.Enable 'Use IP Firewall' in bridge settings

Correct Answer: D

By default, RouterOS does not pass traffic on a bridge interface through the firewall or queue system. If you want to apply queueing (Simple Queues or other policies) on a bridge interface, you must enable the bridge to use the IP Firewall.
MTCNA Official Course Material - Bridging & IP Firewall Integration:
"If you want to apply queues or firewall rules to traffic flowing through a bridge, you must enable 'use-ip- firewall' under the bridge settings." Rene Meneses MTCNA Guide - Bridge Queuing Section:
"Simple Queues do not affect bridged traffic unless you activate the 'Use IP Firewall' setting in bridge configuration. This pushes the packets through the normal firewall and queueing engine." MikroTik Wiki - Bridge Settings:
"If use-ip-firewall is enabled, then all bridged traffic is also processed by firewall and queues." Options A and C are incorrect because assigning an IP or linking the queue alone does not enforce restrictions at Layer 2.
Option B refers to advanced queueing with mangle + Queue Trees, not Simple Queues.

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