In late 1997, IANA transferred responsibility for IP number administration from Network Solutions, Inc. to ARIN[]. ARIN officially opened for operation on October 22, 1997. ARIN is responsible for the allocation of Internet Protocol (IP) numbers in the following geographical areas: • North America • South America • The Caribbean • Sub-Saharan Africa ARIN currently manages allocation and registration services for IP numbers, AS numbers, IN-ADDR.ARPA, and IP6.INT inve..
An RF signal has characteristics that enable it to be sent from an antenna, through the air medium, and received by another antenna at the destination. RF signals are analog in nature. A computer, though, uses digital signals to represent bits of information. Before transmitting data through the air, the transceiver within the radio cards and access points must convert digital signals into analog signals suitable for transmission through the air medium. As part of receiving ..
Completion of the Source Registration Process
So far in this description of PIM-SM, a source (10.1.1.10) sent packets to 228.8.8.8, as shown in Figure 20-13—but no one cared at the time, so the RP did not forward the packets. Next, you learned what happens when a host does want to receive packets, with the routers reacting to create the RPT for that group. This section completes the story by showing how an RP reacts to a PIM Register message when the RP knows that some hosts want to receive those multicasts. When the R..
The Cisco PIX and ASA VPN capabilities have their roots in Cisco IOS VPN technologies. VPNs were first introduced in the Cisco IOS router product line and then added to the PIXs in an early 5.x release. Like the routers and the concentrators, Cisco PIXs support many VPN solutions including IPsec, PPTP, and L2TP. Because of their flexibility, they can be used in many different situations. The ASA was introduced in the spring of 2005. The ASA is a unique hybrid security applian..
For this example, we will take a relatively simple view that the PE router will trust the CE router's DSCP/IP Precedence settings and map them to the MPLS EXP traffic priority field in a simple way. So we will focus on the configuration required on the PE and P routers to make use of this information. First, the PE routers have the dual function of converting DSCP or IP Precedence values to MPLS EXP values and then using this information appropriately when forwarding the pac..
