Next-Generation Internet Initiative

The federally funded Next-Generation Internet (NGI) Initiative[] is a multiagency U.S. federal research and development program that is developing advanced network technologies and revolutionary applications and demonstrating these capabilities on testbeds that are 100 to 1,000 times faster end-to-end than today's Internet. The NGI initiative began October 1, 1997, with the following participating agencies: • DARPA (Defense Advanced Research Projects Agency) • DoE (Depa..

Examining the RP’s Multicast Routing Table

In the current state of the ongoing example, as last shown in Figure 20-16, the RP (R3) has joined the SPT for source 10.1.1.10, group 228.8.8.8. The RP also is the root of the shared tree for group 228.8.8.8. Example 20-9 shows both entries in R3’s multicast route table. Example 20-9 Multicast Route Table Entry for the Group 228.8.8.8 for R3   The first entry shows the shared tree, as indicated by the S flag. Notice the incoming interface is Null because R3, as RP, i..

IEEE 802.11 DCF

Interframe Spaces, shown in Figure 11-3, allow 802.11 to control which traffic gets first access to the channel when carrier sense declares the channel to be free. Figure 11-3. IEEE 802.11 DCF Interframe Spaces [View full size image]     802.11 currently defines three interframe spaces: •    Short interframe spaces (SIFS), which are 10  long •    Point interframe spaces (PIFS), which are 30  long (SIFS + 1 [20 ] slot time..

Using SAA

Cisco supplies a feature called the Service Assurance Agent (SAA) in IOS Version 12.0(5)T and higher, which allows the routers to automatically poll one another to collect end-to-end performance statistics: Router1#configure terminal Enter configuration commands, one per line.  End with CNTL/Z. Router1(config)#rtr responder Router1(config)#rtr 10 Router1(config-rtr)#type echo protocol ipIcmpEcho 10.1.2.3 Router1(config-rtr)#tag ECHO_TEST Router1(config-rtr)#threshold 10..

NTP Authentication

Use the ntp authentication command to authenticate NTP traffic between associations. To configure an NTP enabled router to require authentication when other devices connect to it, use the following commands: Router1#configure terminal Enter configuration commands, one per line.  End with CNTL/Z. Router1(config)#ntp authentication-key 2 md5 oreilly Router1(config)#ntp authenticate Router1(config)#ntp trusted-key 2 Router1(config)#end Router1# Then you must configure th..