Networking Fundamentals Flashcards
7 cards from real ACA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Networking Fundamentals flashcards as text
Which layer of the OSI model is responsible for logical addressing and routing packets between networks?
Answer: Network
The Network layer (Layer 3) handles logical IP addressing and determines the best path for packets across interconnected networks.
What is the default subnet mask for a Class B IP address?
Answer: 255.255.0.0
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.
Which protocol resolves IP addresses to MAC addresses on a local network segment?
Answer: ARP
ARP (Address Resolution Protocol) maps a known IPv4 address to its corresponding MAC address by broadcasting a request on the local segment.
What is the maximum number of usable host addresses in a /28 subnet?
Answer: 14
A /28 subnet has 16 total addresses; subtracting the network and broadcast addresses leaves 14 usable host addresses.
Which transmission mode allows data to flow in both directions simultaneously?
Answer: Full-duplex
Full-duplex allows simultaneous bidirectional communication, effectively doubling throughput compared to half-duplex on the same link.
At which OSI layer does a standard Layer 2 switch make its forwarding decisions?
Answer: Layer 2 – Data Link
A Layer 2 switch reads the destination MAC address in the Ethernet frame header to decide which port to forward the frame out of.
Which IPv6 address type is equivalent to the IPv4 private address range and is used only within a local network?
Answer: Link-Local
Link-local addresses (FE80::/10) are automatically assigned to every IPv6-enabled interface and are only valid within the local link.