As of May 31, 2023, we have updated our Code of Conduct.


A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

The major provider of networking equipment. This is a generic tag to be used when no more specific tags are available. See the list of tags in Help Center Tag page.
For questions about routing, the process of selecting to which network path traffic is sent. Consider using a more specific tag if your question is about a routing protocol like BGP or OSPF.
For questions about network switches, the term commonly refers to a multi-port network bridge that processes and routes data at the data link layer (layer 2) of the OSI model.
1896 questions
For questions about network routers, devices that forward data packets between computer networks, commonly at the network layer (layer 3) of the OSI model.
1571 questions
For questions about Virtual LANs (VLANs) which are used to divide what otherwise would be a single OSI layer-2 broadcast domain into multiple, logical OSI layer-2 broadcast domains.
1224 questions
For questions about Internet Protocol (IP), an OSI layer-3 network protocol. There are two current IP versions in use: IPv4 and IPv6.
961 questions
For questions relating to Ethernet networking, as defined by the IEEE 802.3 standards.
871 questions
For questions about Internet Protocol version 4 (IPv4); as specified in RFC791.
867 questions
For questions about Networking that includes design, and use of a network, the physical cabling, hub, bridge, switch, router, and so forth. Anything in relation to networking and its technologies.
For questions about Transmission Control Protocol (TCP), a transport protocol used to encapsulate data across a network for reliable communication.
779 questions
For questions about Virtual Private Networks (VPNs).
Cisco's Adaptive Security Appliance (ASA) which combines functionality from the PIX, VPN 3000 series and Intrusion Prevention Systems (IPS) product lines
648 questions
BGP is Border Gateway Protocol, used on the internet both inside of and in between networks.
642 questions
For questions about wireless networking (802.11), including any licensed or unlicensed RF medium used to provide point-to-point or point-to-multipoint network links.
636 questions
For questions about Network Address Translation (NAT), a method of modifying network address information in IPv4 packet headers.
629 questions
Questions relating to IP subnetting, including planning, calculation and best practices.
610 questions
For questions about or relating to firewall operations, configuration and troubleshooting.
589 questions
For discussion about Cisco's Internetwork Operating System - Cisco IOS
568 questions
For questions about networking in general. Any question about all on topic network devices can use this tag.
A tag for questions involving Juniper Networks hardware or software.
498 questions
For questions related to traffic switching and troubleshooting the traffic switching process.
473 questions
For questions about Internet Protocol version 6 (IPv6); as specified in RFC 8200.
465 questions
For questions about network protocols published in a Standard or RFC. Do not use this tag merely because the question mentions a networking protocol in it. Questions with this tag *could* be closed …
452 questions
For questions about DHCP in in relation to network devices. For instance, you are setting up DHCP on a layer 3 switch.
442 questions
For questions about Media Access Control (MAC) address which is used as the OSI layer-2 address for many OSI layer-2 protocols.
441 questions
A numerical label assigned to each device (e.g., computer, printer) participating in a computer network that uses the Internet Protocol for communication.
441 questions
For questions about OSPF. Open Shortest Path First (OSPF) is a link-state routing protocol for Internet Protocol (IP) networks.
For questions about the IEEE 802.11 series of protocols, also known as Wi-Fi. This tag should be used when asking about enterprise or corporate Wi-Fi networking questions. Questions about home wireles…
426 questions
For questions about the OSI layer-2 (data-link layer).
385 questions
For questions about Address Resolution Protocol (ARP). ARP resolves OSI layer-3 addresses to OSI layer-2 addresses.
348 questions
For questions about interconnected networks.
333 questions
For questions about Spanning Tree Protocol (STP), a common protocol to prevent bridge loops at OSI layer-2.
327 questions
A tag for questions related to Cisco's Catalyst line of switches.
327 questions
For questions about the OSI layer-3 (network layer).
318 questions
For questions about the OSI layer-1 (physical layer).
310 questions
A tag for questions involving Juniper Networks Operating System (Junos) software.
306 questions
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