Q

The domain name that a DNS query asks about. In error reporting, the QNAME is also used to carry the report itself.

Used in RFC 8020 RFC 9156 RFC 9499 RFC 9567

A resolver technique, defined in RFC 7816, that sends upstream servers only as much of the queried name as they need, to reduce what each server learns about the client.

Plain language A resolver technique that sends upstream servers only the part of a name they need.

Used in RFC 8932 RFC 9076 RFC 9156 RFC 9615

The header compression format for HTTP/3, defined in RFC 9204. Like HPACK it uses tables of previously seen fields, but it is designed so that streams arriving out of order do not block each other.

Plain language The header compression format for HTTP/3 handling out-of-order streams.

Used in RFC 9114

A two-dimensional machine-readable barcode that encodes data in a square pattern of black and white pixels, scannable by cameras on phones and other devices.

Plain language A two-dimensional barcode encoding data in black and white squares readable by phone cameras.

Used in RFC 9238 RFC 9285

How satisfied a user is with a network service, often expressed as a rating or computed from network metrics like speed, latency, and packet loss.

Plain language How satisfied a user is with a network service based on speed and smoothness.

Used in RFC 6064 RFC 7478 RFC 7536 RFC 7875 RFC 7945

A set of techniques that prioritize certain types of traffic (such as voice or video) to ensure they receive predictable, timely delivery even when the network is busy.

Plain language Quality of Service: techniques to prioritize certain traffic for predictable delivery.

Used in RFC 1755 RFC 2207 RFC 2309 RFC 2331 RFC 2382 RFC 2475 RFC 2502 RFC 2638 RFC 2751 RFC 2816 RFC 3181 RFC 3213 RFC 3292 RFC 3374 RFC 3432 RFC 3724 RFC 3726 RFC 4090 RFC 4115 RFC 4128 RFC 4594 RFC 4655 RFC 4665 RFC 4923 and 6 more

Treating some traffic better than other traffic, for example by delivering it faster or ahead of others in a queue. RFC 2549 parodies this with service levels named after airline classes.

Plain language Treating some traffic better than other traffic such as delivering it faster.

Used in RFC 545 RFC 795 RFC 905 RFC 1046 RFC 1077 RFC 1126 RFC 1152 RFC 1190 RFC 1193 RFC 1221 RFC 1287 RFC 1346 RFC 1349 RFC 1363 RFC 1453 RFC 1458 RFC 1633 RFC 1636 RFC 1667 RFC 1677 RFC 1678 RFC 1679 RFC 1680 RFC 1682 and 229 more

The single multicast router on a link that is elected to send the periodic and specific queries. Other routers listen and can take over if it fails.

Plain language The single multicast router on a link elected to send periodic discovery queries.

Used in RFC 2710 RFC 3810 RFC 9777

The extra time a packet spends waiting in a queue at a router. It can be estimated as the current delay minus the delay when no queue exists.

Plain language The time a packet spends waiting in a router's queue before transmission.

Used in RFC 5166 RFC 8033 RFC 8298 RFC 9332 RFC 9840

A general-purpose transport protocol defined in RFC 9000. It runs over UDP and provides reliable, encrypted, multiplexed streams, with TLS 1.3 built into its handshake.

Plain language A transport protocol over UDP providing reliable encrypted multiplexed streams.

Used in RFC 8404 RFC 8470 RFC 8546 RFC 8558 RFC 8744 RFC 8899 RFC 8922 RFC 8999 RFC 9000 RFC 9001 RFC 9002 RFC 9065 RFC 9075 RFC 9095 RFC 9114 RFC 9204 RFC 9221 RFC 9250 RFC 9258 RFC 9287 RFC 9292 RFC 9297 RFC 9298 RFC 9308 and 21 more

A lightweight, ordered sequence of bytes within a QUIC connection. Streams can be bidirectional or unidirectional, are opened simply by sending data on a new stream ID, and are delivered independently of one another.

Plain language A lightweight ordered sequence of bytes within a QUIC connection.

Used in RFC 9000 RFC 9114 RFC 9204 RFC 9221 RFC 9250

A MIME encoding for mostly-ASCII data in which unsafe octets are written as = followed by two uppercase hex digits and a trailing = marks a soft line break.

Plain language A MIME encoding where unusual bytes are written as = followed by two hex digits.

Used in RFC 1341 RFC 1342 RFC 1521 RFC 1522 RFC 1554 RFC 1555 RFC 1557 RFC 1767 RFC 1844 RFC 1847 RFC 1947 RFC 2015 RFC 2045 RFC 2047 RFC 2048 RFC 2049 RFC 2152 RFC 2157 RFC 2646 RFC 2854 RFC 3023 RFC 3030 RFC 3156 RFC 3676 and 4 more