NTLM - Windows NT LAN Manager
Abbreviation for "Windows NT LAN Manager"
The NTLM protocol was the default for network authentication in the Windows NT 4.0 operating system. It is retained in Windows 2000 for compatibility with down-level clients and servers. NTLM is also used to authenticate logons to standalone computers with Windows 2000. Computers with Windows 3.11, Windows 95, Windows 98, or Windows NT 4.0 will use the NTLM protocol for network authentication in Windows 2000 domains. Computers running Windows 2000 will use NTLM when authenticating to servers with Windows NT 4.0 and when accessing resources in Windows NT 4.0 domains.*
NTLM uses a challenge-response mechanism for authentication, in which clients are able to prove their identities without sending a password to the server. It consists of three messages, commonly referred to as Type 1 (negotiation), Type 2 (challenge) and Type 3 (authentication). The protocol continues to be supported in Windows 2000 but has been replaced by Microsoft Kerberosas the default/standard.
Stay up to date on the latest developments in Internet terminology with a free weekly newsletter from Webopedia. Join to subscribe now.
Webopedia's student apps roundup will help you to better organize your class schedule and stay on top of assignments and homework. Read More »20 Ways to Shorten a URL
If you need to shorten a long URL try this list of 20 free online redirection services. Read More »Top 10 Tech Terms of 2015
The most popular Webopedia definitions of 2015. Read More »
This Webopedia study guide describes the different parts of a computer system and their relations. Read More »Network Fundamentals Study Guide
Networking fundamentals teaches the building blocks of modern network design. Learn different types of networks, concepts, architecture and... Read More »The Five Generations of Computers
Learn about each of the five generations of computers and major technology developments that have led to the current devices that we use today. Read More »