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Advance Your Career with Cisco 500-490 ENDESIGN Certification

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Depending on the size, reliability, resiliency, availability, performance, security, and scalability, multiple enterprise and network architecture design options are available for deploying a campus network. Because of that, we should know about each of these features in the Cisco Enterprise Networks Associated Certification one design option.

Table of Contents

  1. The 500-490 ENDESIGN Two-Tier Design
  2. The 500-490 ENDESIGN Three-Tier Design
  3. Two-tier vs. Three-tier Design
  4. 500-490 ENDESIGN Layer 2 Access Layer
  5. 500-490 ENDESIGN Layer 3 Access Layer
  6. 500-490 ENDESIGN Simplified Campus Design
  7. SD-Access Design

The 500-490 ENDESIGN Two-Tier Design

Smaller networks with departments across several levels might save money using the two-tier architecture, often called the collapse score. In this design, connected to the data center, internet edge, and network services are an access layer, a user and endpoint access layer, and a core distribution layer. The distribution and core layers connect the WAN, distant data centers, and other internet branches. This design combines network services like the Cisco Identity Service Engine, Telepresence Manager, and a unified communication manager for wireless LAN controllers. The access layer switch is possible to connect endpoints or end users to distant data centers and cloud providers such as Google Cloud Platform, Microsoft Azure, and Amazon Web Services.

The 500-490 ENDESIGN Three-Tier Design

The axis, distribution, and core layers comprise the three layers of the three-tier design. It is essential to comprehend these characteristics to create a campus network that works. The performance and throughput of a network depend on a three-tier architecture. It needs a core layer, numerous distribution layer switches, and more than two distribution layer switches. For instance, if a business has multiple buildings, each one might need its switch. By connecting many distribution layers, throughput and performance can be improved. This methodology is especially advantageous as the density of devices or services rises.

Two-tier vs. Three-tier Design

Let’s compare the two-tier vs. three-tier design. The three-tier design is complex due to multiple links and switches, while the simplified campus design has fewer logical switches and links. Maintenance and troubleshooting are more accessible with the simplified design, making it recommended to use VSS and stack-wise cap technologies if possible. Both technologies can enhance the network’s functionality if the option is available.

500-490 ENDESIGN Layer 2 Access Layer

Traditional network designs use layer two switches in the access layer, and multi-layer switches in the distribution layer. The loop topology allows VLANs is only one switch, allowing bandwidth usage without blocking each interface. VLAN 10 is available in all access layers in the loop topology, while VLAN 20 is restricted to another switch. This allows bandwidth utilization without blocking each interface. FHRPs (First Hop Redundancy Protocol) can be used between two rotors or MLPs, enabling load balancing between routers. For example, if a PC sends traffic to external networks, it can use one rotor as the active rotor and the other as the backup router.

However, when using the loop topology, the link is blocked, limiting the use of the active switch. In this case, only the active switch is used. The distribution switch is the distribution switch, and the loop topology propagates VLAN 10 interfaces in multiple suites. The link between the switches should be layer two for connectivity between the VLAN 10. However, the root bridge interfaces will be black, and only HSP and VRP can be used for fault transduction.

500-490 ENDESIGN Layer 3 Access Layer

The layer three-axis or rotate access layer switch allows complete layer three routing between the axis and distribution. This layer is the boundary between layer two and layer three domains, and it does not require the first top redundancy protocol (FHRP). The default gateway is on the access layer switch, as it does not require an STP. This results in more bandwidth and increased uplink utilization.

Troubleshooting is easier with the three-axis layer method, as it allows for ping commands and path verification directly from the access layer switch to the distribution layer switch and other devices. Faster convergence time uses layer three links like eIGRP or Enhanced Interior Gateway Routing Protocol. However, this method has some disadvantages, such as the requirement for VLAN 10 to be located only at one switch and a higher cost.

500-490 ENDESIGN Simplified Campus Design

Simplified campus design is an enterprise network architecture method that uses switch clustering features, such as virtual switching systems (VSS) or stacking technologies stack-wise. This allows for converting multiple physical switches to logical switches, resulting in a network with two access-layer switches and two distribution layers. The VSS technology can convert these switches into one logical switch, allowing for using ether channel technologies or aggregation technologies.

Using this design approach across all campus blocks can provide an optimized architecture that is easy to manage, resilient, and more flexible, with a higher aggregated uplink bandwidth capacity. The simplified campus design involves the following:

  • Stacking the access layer switch between the distribution layer and the VSS technology.
  • Aggregating the links between these layers.
  • Utilizing VSS or stacking technology between the two distribution layers.

Simplified design reduces the time spent on configuration, troubleshooting, provisioning, and maintenance. It eliminates the need for first-half redundancy protocol (HSRP), which typically resides on a single logical interface. The simplified campus design also reduces STP dependence by removing the need for loops and ether channels. Increased uplink utilization is another benefit of this network design, as it can aggregate all links to each other without any block links. The network’s topology from the distribution layer to the access layer is logically a hub and spoke topology, reducing complexity and facilitating faster conversion.

SD-Access Design

Software-defined access (SD-access) is the industry’s first intent-based enterprise networking solution, built on Cisco’s digital network architecture (DNA) principles. It provides automated end-to-end segmentation to separate user device and application traffic without redesigning the network. However, managing enterprise networks presents challenges such as manual configuration, fragmented tools, and inconsistent access policies.

With the growth of users and different device types accessing the network, it becomes more complex to configure user credentials and maintain consistent policies across the network. SD-access helps organizations enable policy-based automation from the edge to the cloud, allowing network architects to orchestrate essential business functions like onboarding secure segmentation, IoT integration, and guest access. It will enable quick network access for any user device or application without compromising security.

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