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NetFlow is a feature that was introduced on Cisco routers around 1996 that provides the ability to collect IP network traffic as it enters or exits an interface. By analyzing the data provided by NetFlow, a network administrator can determine things such as the source and destination traffic, class of service, and the causes of congestion.
As related to network technology, COS is a 3-bit field that is present in an Ethernet frame header when 802.1Q VLAN tagging is present.The field specifies a priority value between 0 and 7, more commonly known as CS0 through CS7, that can be used by quality of service (QoS) disciplines to differentiate and shape/police network traffic.
Class Selector mapping [10] Service class DSCP Name DSCP Value IP precedence Examples of application Standard CS0 (DF) 0 0 (000) NTP [11] Low-priority data CS1 8 1 (001) File transfer (FTP, SMB) Network operations, administration and management (OAM) CS2 16 2 (010) SNMP, SSH, Ping, Telnet, syslog: Broadcast video CS3 24 3 (011)
Network Based Application Recognition (NBAR) [1] is the mechanism used by some Cisco routers and switches to recognize a dataflow by inspecting some packets sent.. The networking equipment which uses NBAR does a deep packet inspection on some of the packets in a dataflow, to determine which traffic category the flow belongs to.
The type of service (ToS) field is the second byte of the IPv4 header. It has had various purposes over the years, and has been defined in different ways by five RFCs. [1] Prior to the redefinition, the ToS field could specify a datagram's priority and request a route for low-latency, high-throughput, or highly-reliable service.
Quality of service (QoS) is the description or measurement of the overall performance of a service, such as a telephony or computer network, or a cloud computing service, particularly the performance seen by the users of the network.
In this example: IPv4 address length is 4. Operation (OPER): 16 bits Specifies the operation that the sender is performing: 1 for request, 2 for reply. Sender Hardware Address (SHA): 48 bits Media address of the sender. In an ARP request this field is used to indicate the address of the host sending the request.
In computer networking, a network service is an application running at the network application layer and above, that provides data storage, manipulation, presentation, communication or other capability which is often implemented using a client–server or peer-to-peer architecture based on application layer network protocols.