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faq > Glossary (13 entries)

Terms and definitions

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  • An unknown error or exception reported by applications during network communication. In rare cases, the application communication may be within the same host, yet trouble could still be reported as ...
  • Networking Best Current Practices (NetBcP) are tried and true methodologies to design and operational processes. BCP aid to reduce network fingerpointing before applicaton errors come up (or to ...
  • For the purpose of this site, Auxilliary items are sidebar navigation links to Categories, Changelog, Downloads, RSS, Search, and other non-main navigation pages. On a Cisco device, AUX refers ...
  • Layers in either the TCP/IP Model (1-5) or the OSI Model (1-7). See Comparison of TCP/IP and OSI Models . See L1 , ...
  • Layer 1 in both the TCP/IP Model and OSI Model represents the physical layer. Cabling and media signaling happens here.
  • Layer 2 in both the TCP/IP Model and OSI Model represents the data link layer. Switching lives at this layer. MAC addresses are defined here.
  • Layer 3 in both the TCP/IP Model and OSI Model represents the network layer. Routing happens here. IP addresses are defined at this layer.
  • Layer 4 in the both the TCP/IP Model and OSI Model represents the transport layer. TCP and UDP live at this layer, and this is where port numbers are seen. ...
  • Layer 5 in the TCP/IP Model represents the application layer. HTTP is at the application layer. The application layer is known as L7 (Layer 7) in the OSI ...
  • Layer 6 in the OSI Model represents the presentation layer. L6 is beyond the scope of this site.
  • Layer 7 in the OSI Model . See L5 .
  • TCP 3-way handshake to establish a connection. A connection-oriented protocol, TCP (sitting on top of IP) requires a bidirectional connection between client and server gets established before application layer data ...
  • Out-of-band (OOB) management. Access to network devices when typical access over a functioning network is not possible.