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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.

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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.
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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.
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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.
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For questions about network routers, devices that forward data packets between computer networks, commonly at the network layer (layer 3) of the OSI model.
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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.
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For questions relating to Ethernet networking, as defined by the IEEE 802.3 standards.
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For questions about Internet Protocol (IP), an OSI layer-3 network protocol. There are two current IP versions in use: IPv4 and IPv6.
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For questions about Internet Protocol version 4 (IPv4); as specified in RFC791.
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Cisco's Adaptive Security Appliance (ASA) which combines functionality from the PIX, VPN 3000 series and Intrusion Prevention Systems (IPS) product lines
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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.
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For questions about Virtual Private Networks (VPNs).
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For questions about Transmission Control Protocol (TCP), a transport protocol used to encapsulate data across a network for reliable communication.
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For questions about or relating to firewall operations, configuration and troubleshooting.
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For discussion about Cisco's Internetwork Operating System - Cisco IOS
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For questions about Network Address Translation (NAT), a method of modifying network address information in IPv4 packet headers.
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Border Gateway Protocol, used on the internet both inside of and in between networks.
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Questions relating to IP subnetting, including planning, calculation and best practices.
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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.
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For questions about OSPF. Open Shortest Path First (OSPF) is a link-state routing protocol for Internet Protocol (IP) networks.
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Dynamic Host Control Protocol - automatic assignment of addresses to network devices. Questions about configuring it, blocking rogue DHCP servers, etc.
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For questions related to traffic switching and troubleshooting the traffic switching process.
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For questions about Internet Protocol version 6 (IPv6); as specified in RFC2460.
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A tag for questions involving Juniper Networks hardware or software.
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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…
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For questions about Media Access Control (MAC) address which is used as the OSI layer-2 address for many OSI layer-2 protocols.
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A tag for questions related to Cisco's Catalyst line of switches.
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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 …
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For questions about interconnected networks.
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A general purpose tag to mark discussions of general security topics including firewalls, ACLs, AAA and numerous others related to keeping the network safe from unauthorized access.
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For questions about Spanning Tree Protocol (STP), originally defined by IEEE 802.1D, to prevent bridge loops at OSI layer-2.
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For questions about Address Resolution Protocol (ARP). ARP resolves OSI layer-3 addresses to OSI layer-2 addresses.
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For questions about Local Area Networks (LANs).
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A numerical label assigned to each device (e.g., computer, printer) participating in a computer network that uses the Internet Protocol for communication.
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Questions relating to IPSEC VPN configuration, operation and troubleshooting specifically.
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For questions about the OSI layer-2 (data-link layer).
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For questions about Wireshark, a packet analyzer