- IAS (Internet Authentication Service)
The Microsoft implementation of the RADIUS standard. RADIUS is used to provide network authentication for users attempting to connect to a network. RADIUS has traditionally been used for dial-up connections, but it has recently begun to see usage in a variety of connection scenarios including wireless network clients.
- ICMP (Internet Control Message Protocol)
A protocol in the TCP/IP suite of protocols that is used for testing connectivity. ICMP supports packets that contain error, control, and informational messages and is used by applications such as ping and tracert.
- IGMP (Internet Group Management Protocol)
One of the core protocols in the TCP/IP suite, a routing protocol that is used as part of multicasting.
- IGP (Interior Gateway Protocol)
A protocol that is used to pass routing information for routing networks that are under a common network administration.
- IKE (Internet Key Exchange)
An encryption scheme that allows disparate VPN servers to share encryption key information and make the IPSec protocol practical in today's environment.
- Integrated Services Digital Network (ISDN)
A type of channelized connection (also known as a multiport device). A Primary Rate Interface (PRI) ISDN connection can support two data channels, known as B-channels (short for bearer channels). Each of these B-channels can act as the port for a point-to-point connection. There is an additional 16KB D-channel (short for delta channel) that is used for session control and error handling.
- intelligent forwarding
See conditional forwarding.
- IP (Internet Protocol)
The portion of the TCP/IP suite that is used to provide packet routing.
- IP address
The 32-bit binary address that is used to identify a TCP/IP host's network and host ID. IPv6 IP addresses are 128 bits in length.
- ipconfig (Internet Protocol Configuration)
A command-line utility that can be used to view the configuration details for the host's TCP/IP properties on all installed network adapters. ipconfig can also be used to release or renew an address leased from a DHCP server as well as to display and flush the local DNS cache.
- IPSec (IP Security)
A Layer 3 TCP/IP that provides end-to-end security for data in transit.
- ISAKMP/Oakley (Internet Security Association and Key Management Protocol/Oakley)
A protocol that is used to share a public key between sender and receiver of a secure connection. ISAKMP/Oakley allows the receiving system to retrieve a public key and then authenticate the sender by using digital certificates.
- iterative query
A DNS query sent from a DNS server to one or more DNS servers in search of the DNS server that is authoritative for the name being sought.
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