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Contents vii
Basic Router Concepts .................................................................................................. D-1
What is a Router? ................................................................................................... D-2
Routing Information Protocol ................................................................................... D-2
IP Addresses and the Internet ................................................................................. D-2
Netmask .................................................................................................................. D-4
Subnet Addressing .................................................................................................. D-5
Single IP Address Operation Using NAT ................................................................. D-7
MAC Addresses and Address Resolution Protocol ................................................. D-8
Related Documents ................................................................................................. D-9
Domain Name Server .............................................................................................. D-9
IP Configuration by DHCP .................................................................................... D-10
Internet Security and Firewalls .................................................................................... D-10
What is a Firewall? ................................................................................................ D-10
Stateful Packet Inspection ..................................................................................... D-11
Ethernet Cabling .......................................................................................................... D-11
Uplink Switches and Crossover Cables ................................................................ D-11
Cable Quality ......................................................................................................... D-12