MTCNA Practice Questions

Both ping and traceroute are diagnostic tools used to test connectivity and network path behavior. While both use IP as the transport layer, they rely on specific protocols:

Ping uses ICMP Echo Request and Echo Reply messages.

Traceroute typically uses UDP packets with increasing TTL (Time-To-Live) values to discover each hop.

On MikroTik devices, ping uses ICMP and traceroute uses UDP by default (though ICMP traceroute is also available in some implementations).

A.  

DHCP is unrelated. It's a protocol for IP address assignment.

B.  

IP is a network-layer protocol underlying ICMP and UDP, but it's not the specific diagnostic protocol.

C.  

TCP is a connection-oriented protocol, not used for ping/traceroute.

D.  

Correct. ICMP is the protocol behind ping.

E.  

Correct. UDP is used by default in traceroute to trigger ICMP Time Exceeded messages from routers.

Extract from Official MTCNA Course Material – Tools Section:

“Ping uses the ICMP protocol to send Echo Request and receive Echo Reply. Traceroute sends UDP packets with incremented TTL values to discover intermediate hops.”

Extract from René Meneses Study Guide – Diagnostic Tools:

"Traceroute in RouterOS sends UDP packets to a random port. Routers that receive the packet send ICMP Time Exceeded messages back when TTL expires. Ping uses ICMP directly."

Extract from MikroTik Wiki – Ping and Traceroute:

“Ping uses ICMP protocol. Traceroute sends UDP packets, increasing TTL by one for each hop.”

Bridging loops occur when there are multiple active paths between switches or bridge interfaces, causing broadcast storms or MAC table instability. MikroTik RouterOS supports both STP (Spanning Tree Protocol) and RSTP (Rapid Spanning Tree Protocol) to detect and block redundant paths.

A.  

✔RSTP – Faster and preferred protocol to prevent loops.

B.  

✔STP – The original protocol, slower convergence but still effective.

C.  

✘Connection tracking – Not related to Layer 2 loop prevention.

D.  

✘UDP filter – Filters specific traffic types, doesn’t handle loops.

E.  

✘ICMP filter – Not relevant to Layer 2 loop protection.

Extract from Official MTCNA Course Material – Bridging and STP:

“STP or RSTP must be enabled to prevent bridging loops. RSTP is the recommended version due to faster convergence.”

Extract from René Meneses MTCNA Study Guide – Bridging:

“Always enable STP or RSTP when using bridges with multiple paths to prevent Layer 2 loops.”

Extract from MikroTik Wiki – STP / RSTP:

“STP and RSTP are loop prevention mechanisms for bridges. They dynamically block redundant links.”

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MikroTik allows you to control which clients can connect to your access point through:

WPA/WPA2 security – prevents unauthorized devices from authenticating.

Access List – filters by MAC address and signal strength.

Option breakdown:

A.  

✔access-list – Used to accept/reject client MACs and customize access settings.

B.  

✔wpa – WPA/WPA2 passphrase restricts who can join the network.

C.  

✘WDS – Wireless Distribution System, used for bridging, not access control.

D.  

✘registration-table – A monitoring tool showing currently connected clients; it doesn’t restrict connections.

Extract from Official MTCNA Course Material – Wireless Access Control:

“Use WPA/WPA2 for secure authentication. Access List lets you accept or reject clients based on MAC or signal level.”

Extract from René Meneses MTCNA Study Guide – Wireless Security & Filtering:

“You can limit client access using WPA security and Access List. Registration Table only shows connected users.”

Extract from Terry Combs Notes – Wireless Configuration:

“Access control = WPA + Access List. WDS is for bridging, and registration-table is read-only.”