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This header field is part of HTTP version 1.1, and is ignored by some caches and browsers. It may be simulated by setting the Expires HTTP version 1.0 header field value to a time earlier than the response time. Notice that no-cache is not instructing the browser or proxies about whether or not to cache the content.
As the EtherType in an Ethernet frame using Ethernet II framing is used to multiplex different protocols on top of the Ethernet MAC header it can be seen as an LLC identifier. However, Ethernet frames lacking an EtherType have no LLC identifier in the Ethernet header, and, instead, use an IEEE 802.2 LLC header after the Ethernet header to ...
IEEE 802.2 is the original name of the ISO/IEC 8802-2 standard which defines logical link control (LLC) as the upper portion of the data link layer of the OSI Model. [1] The original standard developed by the Institute of Electrical and Electronics Engineers (IEEE) in collaboration with the American National Standards Institute (ANSI) was adopted by the International Organization for ...
Similar headers are used in Usenet messages, and HTTP headers. In a data packet sent via the Internet, the data (payload) are preceded by header information such as the sender's and the recipient's IP addresses, the protocol governing the format of the payload and several other formats. The header's format is specified in the Internet Protocol.
Although they shouldn't be used for every line, I think using subheads is good. As an encyclopedia is made to find information, I think this should be made easier. Even for small articles, I find it convenient if there's a heading indicating in which part of the article I may find a short history, a collection of external links, or a simple example, or the specific detail I'm looking for.
The hexadecimal AA and AB values were reserved, and an additional header—the SNAP header—was developed; it can support all EtherType values and multiple spaces of private protocol values. IP datagrams and ARP datagrams are transmitted over IEEE 802 networks using LLC and SNAP headers, [ 2 ] except on Ethernet/IEEE 802.3, where they are ...
The most common is to add a list of external links at the end of an article. Put here, in list form, any web sites that you have used or recommend for readers of the article. The standard format for these is to have a level 2 header (i.e. == Header ==) named "External links" followed by a bullet list of links.
The LLC header includes two eight-bit address fields, called service access points (SAPs) in OSI terminology; when both source and destination SAP are set to the value 0xAA, the LLC header is followed by a SNAP header. The SNAP header allows EtherType values to be used with all IEEE 802 protocols, as well as supporting private protocol ID spaces.