1 TCP, UDP, and Port Fundamentals Free Online FlashCards

What delivery does TCP provide?

TCP establishes a connection and provides reliable, ordered byte-stream delivery; lost data is retransmitted and received data is acknowledged.

What delivery guarantees does UDP provide?

UDP sends separate datagrams without a TCP-style connection handshake and does not itself guarantee delivery, order, or protection from duplicates.

What does a port number identify?

A port is a 16-bit number from 0 to 65535 used with a transport protocol to identify an application endpoint on a device.

Are TCP port 53 and UDP port 53 the same endpoint?

TCP and UDP have separate port-number spaces, so TCP port 53 and UDP port 53 are distinct endpoints.

What are IANA’s three port-number ranges?

System (well-known) ports are 0–1023, user (registered) ports are 1024–49151, and dynamic/private ports are 49152–65535.

How do client source ports differ from server destination ports?

A client commonly selects a temporary source port; the server listens on a destination port associated with its service.

Which details distinguish a network flow?

A flow is distinguished by the source and destination addresses, source and destination ports, and transport protocol.

Which protocol and port does SSH commonly use?

SSH commonly uses TCP port 22 for secure remote login and command execution.

Which transports and port does DNS use?

DNS uses both UDP port 53 and TCP port 53.

What are the common default ports for HTTP and HTTPS?

HTTP commonly uses TCP port 80 for unencrypted web traffic by default; HTTPS commonly uses TCP port 443.

Which transport does HTTP/3 use?

HTTP/3 uses QUIC over UDP, commonly on port 443; HTTPS is therefore not synonymous with TCP.

Which UDP ports do DHCP server and client use?

DHCP uses UDP port 67 on the server and UDP port 68 on the client for automatic address and network-configuration assignment.