cisco 200-301 online training

cisco 200-301 online training.. Layer 3 protocols.. Source IP address and destination IP address; . Source port numbers and target port numbers .. CoS or Type of Service (ToS) information; . Inbound interface; . Stream timestamp; .. Next-hop IP address; .. TCP flags. The stream must contain, at a minimum, the source IP address, the destination IP address, and the inbound interface. Cisco uses application-specific integrated circuits (ASICs) to capture stream information. The technology used by the ASIC, Cisco Express Forwarding (CEF), implements many functions in order to shift the processing burden from the CPU to the interface or card. The most common function of CEF is to pass the CPU's traffic forwarding burden to the ASIC. o Another function of CEF is to create flow information for NetFlow. Although the flow information is captured by the ASIC, the CPU of the IOS device must be involved in forwarding the flow information to the NetFlow collector: this work can take up a significant number of CPU cycles. Some NetFlow information can be viewed locally on the IOS device, but to collect and view long-term NetFlow information, a NetFlow collector (which is actually the logging server that understands NetFlow flow information) is required. Cisco supports the following NetFlow versions. . 1:The original NetFlow version. .5: The most common standard implementation. .7: Dedicated to the 6500, 6800, and 7600 products. .8: Reduces the resources consumed (merging flow information). .9: Supports more fields using a flexible file format for IPv6, Multiprotocol Label Switching (MPLS), Border Gateway Protocol (BGP), and multicast. The most common NetFlow implementation is version 5, but the most flexible is version 9. When sending NetFlow information to the collector, you must indicate the version of NetFlow used on the IOS device and the collector so that they understand the flow information. NetFlow messages are sent using the transport protocol UDP. The Cisco NetFlow Collector is a Cisco product that provides a GUI for viewing flow information and statistics in a visual format, including bar charts, pie charts, and histograms. For the collector, aAn important consideration is how many streams of information will be received from how many devices: if too many messages are sent to the collector, it will soon be overwhelmed.Streams need to contain at least the source IP address, destination IP address, and inbound interface. Packets with the same IP address, port number, and Layer 3 protocol information are considered to belong to the same stream. Sending stream information to the collector can take up a significant number of CPU cycles. An important consideration for the collector is how many streams of information will be received from how many devices. Version 5 is the most common NetFlow implementation.17.5.2 Configuring NetFlowTo configure NetFlow, the following four tasks must be performed OEnable data capture on the interface: ingress for inbound and egress for outbound.