ICND1 Network Fundamentals & IP Addressing 2

Question 1

Which subnet mask allows for 14 usable host addresses per subnet?

Accepted Answer

/28

Answer

A /28 mask leaves 4 host bits, yielding 2^4 - 2 = 14 usable host addresses.

Question 2

What is the broadcast address of the subnet 192.168.10.64/26?

Accepted Answer

192.168.10.127

Answer

A /26 block size is 64; subnet 192.168.10.64 has broadcast at .127 (64+64-1).

Question 3

Which layer of the OSI model is responsible for logical addressing and routing?

Accepted Answer

Layer 3 – Network

Answer

Layer 3 (Network) handles logical IP addressing and path determination via routing.

Question 4

A host has IP 172.16.45.200/20. What is the network address of this subnet?

Accepted Answer

172.16.40.0

Answer

A /20 has a block size of 16 in the third octet; 32 ≤ 45 < 48, so the network is 172.16.40.0.

Question 5

Which protocol operates at Layer 2 and is used to map IP addresses to MAC addresses?

Accepted Answer

ARP

Answer

ARP (Address Resolution Protocol) resolves known IP addresses to MAC addresses on the local segment.

(ICND1) Interconnecting Cisco Networking Devices Part 1 Practice Test