Link Layer Topology Discovery
From Wikipedia, the free encyclopedia
| The five-layer TCP/IP model |
|---|
| 5. Application layer |
|
DHCP · DNS · FTP · Gopher · HTTP · IMAP4 · IRC · NNTP · XMPP · POP3 · RTP · SIP · SMTP · SNMP · SSH · TELNET · RPC · RTCP · RTSP · TLS (and SSL) · SDP · SOAP · GTP · STUN · NTP · (more) |
| 4. Transport layer |
| TCP · UDP · DCCP · SCTP · RSVP · ECN · (more) |
| 3. Network/internet layer |
| IP (IPv4 · IPv6) · OSPF · IS-IS · BGP · IPsec · ARP · RARP · RIP · ICMP · ICMPv6 · IGMP · (more) |
| 2. Data link layer |
| 802.11 (WLAN) · 802.16 · Wi-Fi · WiMAX · ATM · DTM · Token ring · Ethernet · FDDI · Frame Relay · GPRS · EVDO · HSPA · HDLC · PPP · PPTP · L2TP · ISDN · ARCnet · LLTD · (more) |
| 1. Physical layer |
| Ethernet physical layer · RS-232 · SONET/SDH · G.709 · Optical fiber · Coaxial cable · Twisted pair · (more) |
Link Layer Topology Discovery (LLTD) is a licensed data link layer protocol for network topology discovery and quality of service diagnostics, developed by Microsoft as part of their Windows Rally set of technologies. The LLTD protocol operates over both wired as well as wireless networks.
LLTD is included in Windows Vista and is used by its Network Map feature to display a graphical representation of the LAN or WLAN, to which the computer is connected. Windows XP does not contain the LLTD protocol and as a result, Windows XP computers do not appear on the Network Map unless the LLTD responder is installed on the Windows XP computer.
Using LLTD specification requires signing Microsoft Windows Rally license agreement. [1] (JPEG picture in DOC)
A non-free, but royalty free Linux reference implementation is available from Microsoft as part of the Windows Rally Development Kit.
