VoIP

Figure 9-2 shows how nonstop forwarding maintains existing voice calls during a management unit failure. Assume the top unit is the management unit. When the management unit fails, the call from phone A is immediately disconnected. The call from phone B continues. On the uplink, the forwarding plane removes the failed LAG member and continues using the remaining LAG member. If phone B has learned VLAN or priority parameters through LLDP-MED, it continues to use those parameters. The stack resumes sending LLDPDUs with MED TLVs once the control plane restarts. Phone B may miss an LLDPDU from the stack, but should not miss enough PDUs to revert its VLAN or priority, assuming the administrator has not reduced the LLDPDU interval or hold count. If phone B is receiving quality of service from policies installed in the hardware, those policies are retained across the management unit restart.

Figure 9-2. NSF and VoIP

Phone A

LAG

Phone B

DHCP Snooping Scenario

Figure 9-3 illustrates an L2 access switch running DHCP snooping. DHCP snooping only accepts DHCP server messages on ports configured as trusted ports. DHCP snooping listens to DHCP messages to build a bindings database that lists the IP address the DHCP server has assigned to each host. IP Source Guard (IPSG) uses the bindings database to filter data traffic in hardware based on source IP address and source MAC address. Dynamic ARP Inspection (DAI) uses the bindings database to verify that ARP messages contain a valid sender IP address and sender MAC address. DHCP snooping checkpoints its bindings database.

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6200 SERIES specifications

The Dell 6200 Series is a notable line of workstations designed for professionals seeking powerful computing solutions in fields such as engineering, architecture, and design. With its robust architecture and advanced technology, this series stands out for its ability to handle demanding applications while offering reliability and performance.

One of the key features of the Dell 6200 Series is its powerful processing capabilities. It typically includes Intel Xeon processors, which provide multiple cores to manage multitasking efficiently. This allows users to run complex simulations or render high-resolution graphics without experiencing lag or slowdown. The processors are designed for optimal thermal management, allowing for sustained performance during extended work sessions.

Another significant aspect of the Dell 6200 Series is its graphics capabilities. These workstations often come equipped with NVIDIA or AMD professional-grade graphics cards, ensuring that they are equipped to handle graphically intensive tasks, such as 3D modeling and video editing. The support for advanced rendering technologies allows professionals to work with high-fidelity visuals and complex datasets with ease.

In terms of expandability, the Dell 6200 Series is designed with flexibility in mind. Users can customize their workstations with a range of configurations, including varied RAM capacities and storage options. This flexibility ensures that the workstation can be tailored to meet the specific requirements of different workloads. The incorporation of Solid State Drives (SSDs) enhances data access speeds, significantly improving boot times and overall system responsiveness.

Additionally, the Dell 6200 Series includes comprehensive connectivity options to facilitate integration with various peripherals and networks. With multiple USB ports, Ethernet ports, and support for multiple display outputs, users can connect to external devices easily, promoting an efficient workflow.

Security features are also a priority in this series. The workstations typically include advanced security measures, such as TPM (Trusted Platform Module) technology, which helps protect sensitive data through hardware encryption and secure storage.

Overall, the Dell 6200 Series delivers a blend of power, flexibility, and security that makes it an excellent choice for professionals in need of a dependable workstation. With its advanced technologies and ample expansion options, users can feel confident that their equipment can handle both current and future demands, making it a smart investment for any professional environment.
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