WAN - large geographical area, beyond LAN administration
      Layer 2 devices
	Dial-up
	ISDN
	PPP
	Frame Relay
	ATM
	dedicated line (leased line)

1.2.4
1.3.1 (keep in mind!)
1.3.2 (familiar)
1.3.3 or classnote ISDN
2.1.3
2.2.2 PPP - LCP, NCP, PAP, CHAP
2.2.6
2.4.1














nmap -sP 192.168.1.0/24
ping 192.168.1.255
arp -a