Cisco CCNA Basic Switching Concepts 2

Question 1

A switch receives a frame with a destination MAC address not in its MAC address table. What does it do?

Accepted Answer

Floods the frame out all ports except the incoming port

Answer

When a switch receives a frame with an unknown unicast destination, it floods the frame out all ports except the one it arrived on.

Question 2

Which switching method begins forwarding a frame before the entire frame is received?

Accepted Answer

Cut-through

Answer

Cut-through switching begins forwarding the frame as soon as the destination MAC address is read, without waiting for the full frame.

Question 3

What is the size of a MAC address?

Accepted Answer

48 bits

Answer

MAC addresses are 48 bits (6 bytes) long, typically expressed as 12 hexadecimal digits.

Question 4

Which part of a MAC address identifies the manufacturer of the network interface card?

Accepted Answer

First 3 bytes (OUI)

Answer

The first 3 bytes of a MAC address form the Organizationally Unique Identifier (OUI), assigned by IEEE to the manufacturer.

Question 5

A network administrator wants to prevent a switch from learning MAC addresses on a specific port dynamically. Which feature should be used?

Accepted Answer

Port security with sticky MAC

Answer

Port security with sticky MAC learning locks down dynamically learned addresses and converts them to secure sticky entries.

Cisco CCNA Practice Test