In recent years, Data Centers have had to accommodate increasingly high structural loads. Data Center devices big and small have gotten heavier, putting greater strain on the rooms and buildings that house them. When designing your server environment, it is prudent to prepare for equipment that can weigh 1500 pounds (680.3 kg), 2000 pounds (907.2 kg), or even more, in a single cabinet location. (Even if your room doesn't have to support such massive equipment today, it may ne..
Many public venues, such as airports, coffee shops, hotels, and convention centers, offer Wi-Fi access to the Internet. This form of network is often referred to as a public wireless LAN (PWLAN). PWLANs allow people who are away from their homes and offices to access e-mail, browse the Internet, and interface with corporate applications. The smaller public “hotspots” may only have a single access point connecting directly to an ISP. Larger implementations usually h..
Troubleshooting PIM Sparse Mode
PIM sparse mode operates differently than dense mode and is more complex. The trouble-shooting steps are similar to the dense mode case. Figure 13-5 shows the troubleshooting flowchart for the PIM sparse mode problem. Figure 13-5. Flowchart for Troubleshooting PIM Sparse Mode Problems The case study that follows examines troubleshooting a PIM sparse mode problem in which the leaf router sends joins to the RP. Figure 13-6 illustrates the network diagram of this case study...
FTP, an application layer protocol of the TCP/IP protocol suite of applications, allows users to transfer files from one host to another. Two ports are required for FTPone port is used to open the connection (port 21), and the other port is used to transfer data (20). FTP runs over TCP and is a connection-oriented protocol. To provide some level of security, FTP allows usernames and passwords to be exchanged before any data can be transferred, adding some form of security aut..
Configuring Frame Relay End-to-End Keepalive
To configure Frame Relay End-to-End Keepalive on a Cisco router, perform the following commands beginning in global configuration mode: Step 1. Define a Frame Relay map class for enabling Frame Relay End-to-End Keepalive with the map-class frame-relay map-class-name global configuration command. Step 2. Under the Frame Relay map class, select the Frame Relay End-to-End Keepalive mode and configure Frame Relay End-to-End Keepalive with f..
