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 The protocol continues to be supported in Windows 2000 but has been replaced by Microsoft Kerberosas the default/standard.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.
From wacky alarm clocks to lecture hall tools and after class entertainment, these Android apps are a good fit for a student's life and budget. Read More »Sharing Threat Intelligence
A growing number of startups make the sharing of threat intelligence a key part of their solutions. Read More »Smiley Faces and Symbols
A text smiley face is used to convey a facial expression or emotion in texting and online chat conversations. This Webopedia guide shows you how... Read More »
The Open System Interconnection (OSI) model defines a networking framework to implement protocols in seven layers. Use this handy guide to compare... 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 »Computer Architecture Study Guide
This Webopedia study guide describes the different parts of a computer system and their relations. Read More »