Technical data

1.1 Overview of TCP/IP Services
TCP/IP Services provides support for several protocols at every level of the TCP/IP
model’s protocol layers.
• Data Link layer
• Internet layer
• Transport layer
•Applicationlayer
Figure 1–1 shows the various layers and protocols of the TCP/IP model. A
description of each layer and protocol follows the figure.
Figure 1–1: The TCP/IP Model
Application Layer
Transport Layer
Data Link Layer
VM-0402A-AI
Internet Layer
Finger
Protocol
Printing: LPD
& TELNETSYS
OSPF
File Transfer
Protocol (FTP)
Remote
Mail:
SMTP and POP
Commands
(R Commands)
Remote
Network Device Drivers
Terminal Protocol
Network Controllers
(TELNET)
Local Area Network
Network Time
Simple Network
Protocol
Trivial File
(NTP)
Management
Dynamic Host
Configuration
Protocol (DHCP)
Protocol (SNMP)
Routing discovery
protocols and
daemons
Load Broker
Transfer Protocol
Berkeley Internet
(TFTP)
Network File
System (NFS)
and PC-NFS
Name Domain
(BIND) Server
Address Resolution
Protocol (ARP)
Internet Control
Message Protocol
(ICMP)
SLIP/PPP
Internet Protocol
(IP)
Transmission Control
Protocol (TCP)
User Datagram
Protocol (UDP)
1–2 Introducing Compaq TCP/IP Services for OpenVMS