IEEE 802.3af PoE and IEEE 802.3at PoE+

(Summary from Deploying Brocade FastIron-based PoE and PoE+ Solutions in the Campus Network) The IEEE 802.3af and 802.3at specifications define the standards for delivering power over existing network cabling infrastructure and providing multicast-enabled full streaming audio and video applications for converged services, such as Voice over IP (VoIP), WLAN access points, IP surveillance cameras, and other … Continue reading IEEE 802.3af PoE and IEEE 802.3at PoE+ →

IEEE 802.1q

The IEEE 802.1Q specification establishes a standard method for tagging Ethernet frames with VLAN membership information. The header has 4 parts: Tag Protocol Identifier (TPID) - 16-bit The TPID includes an Ethernet Type value that is used to identify the frame as a tagged frame and to select the correct tag decoding functions This is … Continue reading IEEE 802.1q →

sFlow

sFlow is a technology for monitoring traffic in data networks containing switches and routers. The sFlow monitoring system consists of an sFlow Agent (embedded in a switch or router or in a standalone probe) and a central sFlow Collector. The sFlow Agent uses sampling technology to capture traffic statistics from the device it is monitoring. … Continue reading sFlow →

OSI Summary

Application Layer 7 The Application Layer is where the data is created. Presentation Layer 6 It takes information from the Application Layer and presents it in its proper format. Session Layer 5 The Session Layer's job is keeping track of conversations. Transport Layer 4 Makes sure that data gets there reliably Network Layer 3 The … Continue reading OSI Summary →