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A computer that is a gateway between two networks at OSI layer 3 and that relays and directs data packets through that inter-network. The most common form of router operates on IP packets.
NIST SP 800-82 Rev. 2 under Router RFC 4949
NISTIR 8183 under Router NIST SP 800-82, NIST SP 800-82 Rev. 2
NISTIR 8183A Vol. 1 under Router NIST SP 800-82
NISTIR 8183A Vol. 2 under Router NIST SP 800-82
NISTIR 8183A Vol. 3 under Router NIST SP 800-82
On a network, a device that determines the best path for forwarding a data packet toward its destination. The router is connected to at least two networks, and is located at the gateway where one network meets another.
NIST SP 800-47 under Router