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

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Question 46

Which of the following is used in standard 802.11 wireless networks?

A.CSMA/CA
B.CDMA
C.FDD
D.CSMA/CD

Correct Answer: A

802.11 (Wi-Fi) wireless networks use CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) as their access method.
Unlike wired Ethernet, which uses CSMA/CD (Collision Detection), wireless devices can't detect collisions efficiently. So they use avoidance techniques, like:
* RTS/CTS (Request to Send)
* Back-off timers
Evaluation:
* A. CSMA/CA ##Correct method used in wireless networks
* B. CDMA ##Used in cellular technologies like 3G, not Wi-Fi
* C. FDD (Frequency Division Duplexing) ##Not part of Wi-Fi MAC layer
* D. CSMA/CD ##Used in Ethernet (wired), not suitable for wireless
MTCNA Course Manual - 802.11 Wireless Principles:
"Wireless uses CSMA/CA to avoid collisions, as it's difficult to detect them in the air." Rene Meneses Guide - Wireless Technology Overview:
"Wi-Fi operates under CSMA/CA, which is based on listen-before-talk and collision avoidance." Terry Combs Notes - Wi-Fi Access Methods:
"Wired = CSMA/CD. Wireless = CSMA/CA. They are not interchangeable."
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Question 47

How often are BPDUs sent from a Layer 2 device?

A.Never
B.Every 2 seconds
C.Every 10 minutes
D.Every 30 seconds

Correct Answer: B

BPDU (Bridge Protocol Data Units) are messages exchanged by switches in a Spanning Tree Protocol (STP) topology to maintain loop-free Layer 2 networks. By default, switches send BPDUs every 2 seconds.
MTCNA Course Material - STP Operation:
"Switches send BPDUs to maintain spanning tree and detect topology changes. The default transmission interval is 2 seconds." Cisco STP Documentation:
"BPDUs are transmitted by the root bridge and propagated every 2 seconds by default, controlled by the hello- time timer." Other options:
* A: Incorrect - BPDUs are essential for loop prevention
* C & D: Not correct - default is 2 seconds, not minutes

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Question 48

You want to use PCQ and allow 256k maximum download and upload for each client. Choose correct argument values for the required queue.

A.kind=pcq pcq-rate=256000 pcq-classifier=src-address
B.kind=pcq pcq-rate=1256000 pcq-classifier=dst-address
C.kind=pcq pcq-rate=256000 pcq-classifier=dst-address
D.kind=pcq pcq-rate=5000000 pcq-classifier=src-address
E.kind=pcq pcq-rate=5000000 pcq-classifier=dst-address

Correct Answer: A,C

PCQ (Per Connection Queue) is used in MikroTik to enforce bandwidth fairness across multiple users. To limit each client to 256k:
* pcq-rate=256000 # sets maximum bandwidth per client to 256,000 bps (256 kbps)
* pcq-classifier=src-address # used in upload queues
* pcq-classifier=dst-address # used in download queues
So:
* A.#Used for upload: src-address
* C.#Used for download: dst-address
The other options have incorrect rates or classifiers:
* B.#Incorrect rate (1256000 # 256k)
* D & E.#Incorrect rate (5000000 = 5 Mbps)
MTCNA Course Manual - PCQ Explanation:
"Use pcq-classifier=src-address for upload, and dst-address for download. pcq-rate sets per-client limit." Rene Meneses Study Guide - Queue Management:
"To cap clients to 256k, configure pcq-rate=256000. Adjust classifiers based on traffic direction." Terry Combs Notes - PCQ Parameters:
"Classifier is the key. src-address = upload, dst-address = download. Don't mix."

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Question 49

You have 10 users plugged into a hub running 10Mbps half-duplex. There is a server connected to the switch running 10Mbps half-duplex as well. How much bandwidth does each host have to the server?

A.1 Mbps
B.10 Mbps
C.2 Mbps
D.100 kbps

Correct Answer: B

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Question 50

Choose all valid hosts address range for subnet 15.242.55.62/27

A.15.242.55.3315.242.55.62
B.15.242.55.3215.242.55.63
C.15.242.55.3315.242.55.63
D.15.242.55.3115.242.55.62

Correct Answer: A

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