Cisco CCNA OSI and TCP/IP Models 4

Question 1

A switch receives a frame with an unknown destination MAC address. What does it do?

Accepted Answer

Floods the frame out all ports except the one it was received on

Answer

When a switch receives a frame with an unknown unicast destination MAC, it floods the frame out all ports except the ingress port (unknown unicast flooding).

Question 2

At which OSI layer does a hub operate?

Accepted Answer

Layer 1 - Physical

Answer

A hub operates at Layer 1 (Physical) and simply repeats electrical signals out all ports without examining MAC or IP addresses.

Question 3

Which field in the Ethernet frame is used at the OSI Data Link layer to detect transmission errors?

Accepted Answer

Frame Check Sequence (FCS)

Answer

The Frame Check Sequence (FCS) uses a CRC algorithm to detect bit errors in the Ethernet frame at the Data Link layer.

Question 4

Which TCP/IP model layer corresponds to both the OSI Session and Presentation layers?

Accepted Answer

Application

Answer

The TCP/IP Application layer combines the functions of OSI layers 5 (Session), 6 (Presentation), and 7 (Application).

Question 5

What type of address does the OSI Network layer use to deliver packets between networks?

Accepted Answer

Logical (IP) address

Answer

The Network layer (Layer 3) uses logical IP addresses to identify source and destination hosts across different networks.

Cisco CCNA Practice Test

Cisco CCNA Practice Test

Cisco CCNA OSI and TCP/IP Models 4