The decommissioning of the NSFNET in 1995 marked the beginning of a new era. The Internet today is a playground for thousands of providers competing for market share. Research networks such as Abilene and vBNS are struggling to stay ahead of the curve, as an evolving multibillion-dollar industry continues to exceed all expectations. For many businesses and organizations, connecting their networks to the global Internet is no longer a luxury, but a requirement for staying comp..
All the options for IP forwarding (routing) in this chapter had one thing in common: The destination IP address in the packet header was the only thing in the packet that was used to determine how the packet was forwarded. Policy routing allows a router to make routing decisions based on information besides the destination IP address. Policy routing’s logic begins with the ip policy command on an interface. This command tells IOS to process incoming packets with different l..
FDDI Trunks and 802.10 Encapsulation
ISL trunk encapsulation is designed for trunking over a point-to-point connection between two Catalysts using Ethernet. Only two Catalysts connect to the link. This contrasts with connectivity over an FDDI system. FDDI operates as a shared network media (half duplex) and can have more than two participants on the network. A different encapsulation scheme, therefore, is used when trunking over an FDDI network. Cisco adapted an IEEE standard for secure bridging over an 802-base..
if you don't configure a valid DNS nameserver, the router sends these queries to the local broadcast IP address, 255.255.255.255. Querying a nonexistent nameserver is not only unproductive, but it can also be quite time consuming if it happens in an interactive session, since the router will not return the EXEC prompt until the query times out. This can be quite frustrating because, by default, the router will interpret any unknown command as a hostname that you want to conne..
Allocating Static IP Addresses with DHCP
The following commands ensure that the router assigns the same IP address to a device each time it requests one: Router1#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router1(config)#ip dhcp pool IAN Router1(dhcp-config)#host 172.25.1.33 255.255.255.0 Router1(dhcp-config)#client-identifier 0100.0103.85e9.87 Router1(dhcp-config)#client-name win2k Router1(dhcp-config)#default-router 172.25.1.1 Router1(dhcp-config)#domain-name or..
