ccna 200 301 booksmart showtimes 80401

ccna 200 301 booksmart showtimes 80401.You can tell this is an SNAP frame by the following fields: the DSAP and SSAP fields are always AA, and the Command field is always AA.(Command) field is always 3.This type of frame was created because not all protocols can use 802.3 Ethernet frames.74Some protocols do not contain an "Ethernet type" field. In order to carry these private protocols developed by application developers in LLC frames, the IEEE defined the SNAP format, which uses the exact same code as Ethernet Type II. SNAP frames faded out of the enterprise market until about 1997. However, an Ethernet SNAP field is used in the definition of 802.11 wireless LANs to identify the network layer protocol. Cisco also still uses SNAP frames to carry its private protocol, CDP (Cisco Discovery Protocol), but SNAP is no longer used in today's Ethernet LAN networks.3.1.6 The Physical Layer of EthernetThe first to come up with the concept of Ethernet was an organization called DIX (Digital, Intel, and Xerox Corporation). They created and published the first definition of an Ethernet LAN, from which the IEEE created the IEEE802.3 standard. Ethernet began as a 10Mbit/s network using coaxial cables, and has evolved to use physical media such as twisted pair and fiber optics.The IEEE expanded the 802.3 standard into two new standards: 802.3u (Fast Ethernet) and 802.3ab (Gigabit Ethernet using Category 5 wire), and later added 802.3ae (10Gbit/s networks using fiber and coaxial cable).Figure 3.5 illustrates IEEE 802.3 and the original Ethernet physical layer definition.Figure 3.5 The original Ethernet physical layer definition