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Answer 5 free CISCO questions

Straight from our free CISCO paper (CCNA (Cisco Certified Network Associate) — Free Practice Test). No sign-up needed to try. Pick an answer and you will see why it is right.

Question 1 of 5

How many layers does the OSI reference model have?

Answer: 7

The OSI model has 7 layers: Physical, Data Link, Network, Transport, Session, Presentation, and Application.

Question 2 of 5

At which OSI layer does a switch primarily operate?

Answer: Layer 2 (Data Link)

Traditional switches forward frames based on MAC addresses, which is Layer 2, the Data Link layer.

Question 3 of 5

At which OSI layer does a router primarily operate?

Answer: Layer 3 (Network)

Routers make forwarding decisions based on IP addresses, which is Layer 3, the Network layer.

Question 4 of 5

What is the subnet mask for a /26 network in dotted-decimal notation?

Answer: 255.255.255.192

A /26 prefix has 26 network bits, corresponding to 255.255.255.192 in dotted-decimal notation.

Question 5 of 5

How many usable host addresses exist in a /28 subnet?

Answer: 14

A /28 has 4 host bits (32-28=4), giving 2^4=16 total addresses, minus network and broadcast = 14 usable hosts.

Sample questions are original practice content written to match the CISCO format. They are not reproductions of CISCO past papers.