| The Internet Protocol Suite | |
| Application Layer | |
|---|---|
| BGP · DHCP · DNS · FTP · GTP · HTTP · IMAP · IRC · Megaco · MGCP · NNTP · NTP · POP · RIP · RPC · RTP · RTSP · SDP · SIP · SMTP · SNMP · SOAP · SSH · Telnet · TLS/SSL · XMPP · (more) | |
| Transport Layer | |
| TCP · UDP · DCCP · SCTP · RSVP · ECN · (more) | |
| Internet Layer | |
| IP (IPv4, IPv6) · ICMP · ICMPv6 · IGMP · IPsec · (more) | |
| Link Layer | |
| ARP · RARP · NDP · OSPF · Tunnels (L2TP) · PPP · Media Access Control (Ethernet, MPLS, DSL, |
|
The Quote Of The Day (QOTD) service is an Internet protocol defined in RFC 865. It is intended for testing and measurement purposes.
A host may connect to a server that supports the QOTD protocol, on either TCP or UDP port 17. The server then returns a short arbitrary message. This was traditionally a random selection from a list of notable quotes.
The QOTD service is rarely enabled, and is in any case often firewalled to avoid 'pingpong' attacks (www.securityspace.com).
Current testing and measurement of IP networks is more commonly done with ping and traceroute.
This entry is from Wikipedia, the leading user-contributed encyclopedia. It may not have been reviewed by professional editors (see full disclaimer)
