layer 4 flash cards
(16 cards)
Q: What OSI layer is responsible for segmentation and reassembly?
A: Layer 4 – The Transport Layer
Q: What two protocols operate at the Transport Layer?
A: TCP and UDP
Q: What is multiplexing in the transport layer?
A: Using port numbers to manage multiple conversations on one device.
Q: Is TCP connection-oriented or connectionless?
A: Connection-oriented
Q: What does TCP use to ensure reliability?
A: Acknowledgments and retransmissions
Q: What is the 3-way handshake in TCP?
A: SYN → SYN-ACK → ACK
Q: Does TCP guarantee packet order?
A: Yes
Q: What are TCP flags used for?
A: To control connection (e.g., SYN, ACK, FIN, RST)
Q: What field in TCP tells the receiver how many bytes it can accept?
A: Window Size
Q: Is UDP connection-oriented or connectionless?
A: Connectionless
Q: Does UDP guarantee delivery?
A: No
Q: Why is UDP faster than TCP?
A: It has less overhead and no connection setup.
Q: What are typical applications of UDP?
A: DNS, DHCP, VoIP, video streaming, TFTP
Q: What is common in both TCP and UDP headers?
A: Source Port, Destination Port, Checksum
Q: Which protocol includes Sequence and Acknowledgment numbers?
A: TCP
Q: What field defines segment size in UDP?
A: Length
