A link is a layer 2 network packet transport medium, examples are Ethernet, Token Ring, PPP, SLIP, ATM, ISDN, Frame Relay,...
A node is a host or a router.
Generally a single homed host on a link. Normally it has only one active network interface, e.g. Ethernet or (not and) PPP.
A dual homed host is a node with two network (physical or virtual) interfaces on two different links, but does not forward any packets between the interfaces.
A router is a node with two or more network (physical or virtual) interfaces, capable of forwarding packets between the interfaces.
A tunnel is typically a point-to-point connection over which packets are exchanged which carry the data of another protocol, e.g. an IPv6-in-IPv4 tunnel.
Network Interface Card
The special character "¬" is used for signaling that this code line is wrapped for better viewing in PDF and PS files.
In generic examples you will sometimes find the following:
<myipaddress> |
For real use on your system command line or in scripts this has to be replaced with relevant content (removing the < and > of course), the result would be e.g.
1.2.3.4 |
Commands executable as non-root user begin with $, e.g.
$ whoami |
Commands executable as root user begin with #, e.g.
# whoami |