(Bare) Physical Structure of the Internet

One component of understanding the Internet is knowledge of its physical parts. Given below is a list of terms that will probably be useful an endeavor to understand the Internet. For each item:
• locate it in relation to components of the diagram
• describe it (hardware, software, wire, ...
• indicate it's function
A few questions relating to the structure of the internet are also provided. Considering them should clarify your understanding of the various entities and their relationship.

Term `==================`	Description and Function `=============================================================`
host
router
client
packet
transfer rate
bandwidth
backbone
domain name
DNS
bridge
gateway
firewall
HTML
FTP
HTTP and HTTPS
hub
IP address
TCP/IP
ISDN
ISP
NSP
modem
network interface card
node
switch
telnet & ssh
URL
wireless
workstation
LAN
WAN
T1, T3
.
.
.

Question `========================`	Response `===========================================================`
Can the same machine be a client and a server?
Is a separate machine needed for each service? (e.g., Web server, mail server, etc.)
Are routers, bridges, switches, gateways, etc. the same or different?
Will a T1 line let me watch internet movies?
What is required to connect my PC to the Internet?
.

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