see for all hardware here
 

What is the: WAN ?
http://freedownloadablebooks.blogspo...at-is-wan.html
What is the: UNIX ?
http://freedownloadablebooks.blogspo...t-is-unix.html
What is the: ADSL ?
http://freedownloadablebooks.blogspo...t-is-adsl.html
What is the: Intranet
http://freedownloadablebooks.blogspo...-intranet.html
What is the: SMDS
http://freedownloadablebooks.blogspo...t-is-smds.html
What is the: Browser ?
http://freedownloadablebooks.blogspo...s-browser.html
What is the: SNMP
http://freedownloadablebooks.blogspo...t-is-snmp.html
What is the: NNTP ?
http://freedownloadablebooks.blogspo...t-is-nntp.html
What is the: NIC
http://freedownloadablebooks.blogspo...at-is-nic.html
What is the: Java ?
http://freedownloadablebooks.blogspo...t-is-java.html
What is the: Zone file
http://freedownloadablebooks.blogspo...zone-file.html
What is the: URL
http://freedownloadablebooks.blogspo...at-is-url.html
What is the: PSTN
http://freedownloadablebooks.blogspo...t-is-pstn.html