TCP/IP & OSI Model Layers Flashcards
7 cards from real CCP practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 TCP/IP & OSI Model Layers flashcards as text
In IPv6, which mechanism replaces ARP for neighbor address resolution?
Answer: Neighbor Discovery Protocol (NDP)
IPv6 uses the Neighbor Discovery Protocol (NDP), which leverages ICMPv6 messages, to resolve link-layer addresses instead of ARP.
Which OSI layer manages dialogue control and coordinates communication between applications?
Answer: Session layer (Layer 5)
The Session layer (Layer 5) establishes, manages, and terminates sessions between communicating applications.
What is the purpose of TCP's congestion control mechanism?
Answer: Prevent routers from discarding packets when the network is congested
TCP congestion control (slow start, congestion avoidance, fast retransmit) reduces transmission rate when it detects network congestion to avoid overwhelming routers.
Which layer of the OSI model does a hub operate at?
Answer: Layer 1 – Physical
A hub is a Physical layer device that simply repeats electrical signals to all ports without examining frame content.
In classful IPv4 addressing, what is the default subnet mask for a Class B network?
Answer: 255.255.0.0
Class B networks use a default subnet mask of 255.255.0.0 (/16), supporting up to 65,534 hosts per network.
What happens during the TCP connection teardown when the FIN flag is used?
Answer: A four-way FIN/ACK exchange allows each side to close independently
TCP uses a four-way handshake (FIN, ACK, FIN, ACK) for graceful teardown, allowing each direction of data flow to close independently.
Which well-known port number is assigned to HTTPS?
Answer: 443
HTTPS (HTTP Secure) uses TCP port 443 by default, providing encrypted web communication via TLS/SSL.