ACA Networking Fundamentals 2

Question 1

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

Accepted Answer

Network

Answer

The Network layer (Layer 3) handles logical IP addressing and determines the best path for packets across interconnected networks.

Question 2

What is the default subnet mask for a Class B IP address?

Accepted Answer

255.255.0.0

Answer

Class B addresses use a default subnet mask of 255.255.0.0 (/16), covering the range 128.0.0.0 to 191.255.255.255.

Question 3

Which protocol resolves IP addresses to MAC addresses on a local network segment?

Accepted Answer

ARP

Answer

ARP (Address Resolution Protocol) maps a known IPv4 address to its corresponding MAC address by broadcasting a request on the local segment.

Question 4

What is the maximum number of usable host addresses in a /28 subnet?

Accepted Answer

14

Answer

A /28 subnet has 16 total addresses; subtracting the network and broadcast addresses leaves 14 usable host addresses.

Question 5

Which transmission mode allows data to flow in both directions simultaneously?

Accepted Answer

Full-duplex

Answer

Full-duplex allows simultaneous bidirectional communication, effectively doubling throughput compared to half-duplex on the same link.

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