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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.
2193 questions
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.
1951 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.
1600 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.
1254 questions
For questions about Internet Protocol (IP), an OSI layer-3 network protocol. There are two current IP versions in use: IPv4 and IPv6.
987 questions
For questions about Internet Protocol version 4 (IPv4); as specified in RFC791.
895 questions
For questions relating to Ethernet networking, as defined by the IEEE 802.3 standards.
894 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.
843 questions
For questions about Transmission Control Protocol (TCP), a transport protocol used to encapsulate data across a network for reliable communication.
801 questions
BGP is Border Gateway Protocol, used on the internet both inside of and in between networks.
680 questions
Cisco's Adaptive Security Appliance (ASA) which combines functionality from the PIX, VPN 3000 series and Intrusion Prevention Systems (IPS) product lines
669 questions
For questions about Virtual Private Networks (VPNs).
659 questions
For questions about Network Address Translation (NAT), a method of modifying network address information in IPv4 packet headers.
649 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.
643 questions
Questions relating to IP subnetting, including planning, calculation and best practices.
635 questions
For questions about or relating to firewall operations, configuration and troubleshooting.
600 questions
For discussion about Cisco's Internetwork Operating System - Cisco IOS
578 questions
For questions about networking in general. Any question about all on topic network devices can use this tag.
571 questions
A tag for questions involving Juniper Networks hardware or software.
528 questions
For questions related to traffic switching and troubleshooting the traffic switching process.
482 questions
For questions about Internet Protocol version 6 (IPv6); as specified in RFC 8200.
481 questions
For questions about DHCP in in relation to network devices. For instance, you are setting up DHCP on a layer 3 switch.
459 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 …
457 questions
A numerical label assigned to each device (e.g., computer, printer) participating in a computer network that uses the Internet Protocol for communication.
455 questions
For questions about Media Access Control (MAC) address which is used as the OSI layer-2 address for many OSI layer-2 protocols.
446 questions
For questions about OSPF. Open Shortest Path First (OSPF) is a link-state routing protocol for Internet Protocol (IP) networks.
444 questions
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…
439 questions
For questions about the OSI layer-2 (data-link layer).
400 questions
For questions about Address Resolution Protocol (ARP). ARP resolves OSI layer-3 addresses to OSI layer-2 addresses.
362 questions
A tag for questions related to Cisco's Catalyst line of switches.
343 questions
For questions about interconnected networks.
341 questions
For questions about Spanning Tree Protocol (STP), a common protocol to prevent bridge loops at OSI layer-2.
339 questions
For questions about the OSI layer-3 (network layer).
326 questions
A tag for questions involving Juniper Networks Operating System (Junos) software.
320 questions
For questions about the OSI layer-1 (physical layer).
316 questions
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