layer 4-7

(redirected from L4-7)

layer 4-7

The two layers in a network packet that identify its content (for details about layers, see TCP/IP and OSI model). The bottom layers 1, 2 and 3 are the protocols that move a network packet from source to destination. Layers 4 and 7 identify the application that created the packets as well as the specifics of the request. For example, inspecting layer 4 can identify HTTP traffic (Web traffic), but inspecting layer 7 can determine what the HTTP request is for (see Web switch). See layer 4 switch and well-known port.


TCP/IP SWITCHING/ROUTING DECISIONSLayer and      ForwardingProtocol       DecisionInspected      Based on

  2 - Ethernet   MAC address

  3 - IP         Network address
  3 - IP         Service quality

  4 - TCP/UDP    Traffic type
      socket     (HTTP, FTP, etc.)

  7 - HTTP       HTTP request type
References in periodicals archive ?
and cloud platforms that enable dynamic L4-7 security and application services
virtual appliances to dynamically and automatically provision L4-7 network
OpenArchitect, the control plane management software for silicon switch fabrics, delivers comprehensive L3 routing capabilities, L4-7 filtering, plus Class-of-Service features.
"We continue to extend the breadth of our L4-7 protocol coverage by supporting testing for malicious traffic such as DDoS Attacks," said Roy Chua, director of product marketing for Spirent Communications.