The most obvious way to troubleshoot DHCP installations is to type show run and compare the output to this book. This approach, however, can fail due to a lack of details. A more robust way to troubleshoot is to examine the process step-by-step as assignments are made. Before discussing troubleshooting, we need to rule out some issues. We assume, in this section, that the PC has been shown to have a connection to the network, and the DHCP server is turned on. ..
A flow might be partially switched instead of completely switched in these situations: • If the switch is configured as a member of the IP multicast group on the RPF interface of the multicast source (using the ip igmp join-group command). • During the registering state, if the switch is the first-hop router to the source in PIM sparse mode (in this case, the switch must send PIM-register messages to the rendezvous point [RP]). • If the multicast TTL threshold is ..
Security is one of the most important features of a wireless LAN. Companies and home users must protect their information from hackers. The 802.11 standard offers security mechanisms that have undergone significant scrutiny over the past few years. Recently, improvements have been made by the Wi-Fi Alliance and via newer versions of the 802.11 standard. The most common wireless security mechanisms currently in use today are as follows: ■ Wired Equivalent Privacy (WEP) ■..
RTS/CTS and Fragmentation Summary
Table 22-3 summarizes some of the benefits and drawbacks of both RTS/CTS and fragmentation when trying to improve throughput in a wireless network. Table 22-3 Improving Throughput Using RTS/CTS and Fragmentation
Movement of Regionals onto Commercial Providers
The NSFNETregional and mid-level networks that previously provided the distribution layer of the network needed a new core. However, more than one core existed in the new architecture, and these commercial core providers were connected to the four Internet NAPs. Each regional network then had two connection choices: Connect directly to a NAP, establish peering relationships with other regionals, and establish a customer relationship with one or more of the commercial core p..
