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Examining Cisco Enterprise Network Architecture

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1. Cisco Enterprise Architecture Modules

Modular design isolates fault domains (failures stay within a module), simplifies upgrades, and standardizes security/QoS policies.ç

Enterprise Campus

  • Structure: Uses the classic 3-Tier Hierarchy (Access, Distribution, Core).

  • Data Center Submodule: Centralizes core enterprise services (Application, File, Email, DNS, Network Management). Built on a modern Spine-Leaf architecture.

Enterprise Edge (Explicitly split into two main blocks in the diagram)

  • Internet Edge Submodule: Manages direct public internet connectivity across one or more ISPs, hosting firewalls and internet-facing services.

  • WAN Edge Submodule: Manages high-performance site-to-site connectivity using purchased WAN services (MPLS, Metro Ethernet, SONET) and QFP routing infrastructure.

  • Services: Provides VPN termination (Remote Access & Site-to-Site) and perimeter firewalls.

Service Provider Edge

  • Represents the third-party transit networks bounded by Service Level Agreements (SLAs):

    • ISP

    • WAN Provider MetroEthernet

    • WAN Provider MPLS

Remote Locations

  • Geographically distant endpoints connected back to the Enterprise Edge:

    • Remote Worker / Teleworker: Connected over the Internet Edge via remote VPN.

    • Branch Offices: Connected via MetroEthernet or MPLS to the WAN Edge.

    • Remote Data Centers.

2. Four Pillars of Design

  • Self-Healing: Continuously online; automatically isolates failures and restores service.

  • Self-Defending: Embedded security protecting enterprise infrastructure, traffic, and endpoints.

  • Self-Optimizing: Dynamically adapts to workload changes beyond static baseline capabilities.

  • Self-Aware: Leverages deep network visibility to drive automated operational decisions.

3. High-Yield Hardware & Media Trends

Multi-Gigabit & Cable Infrastructure

  • 802.11ac Wave 2 / Wi-Fi 6 APs demand speeds exceeding 1 Gbps.

  • IEEE 802.3bz (Multigigabit): Delivers 2.5 Gbps and 5 Gbps speeds over existing Cat5e/Cat6 copper cabling using Cisco Catalyst Multigigabit technology (eliminating expensive cable upgrades).

Power over Ethernet (PoE)

  • Cisco UPOE (Universal PoE): Delivers up to 60W per port for high-power devices (cameras, VDI terminals, lighting, APs).

  • Perpetual PoE: Keeps connected devices powered continuously even when the switch undergoes a software upgrade or reboot.

  • Catalyst 9000 Series: Access layer switches support Perpetual PoE and are hardware-ready for 100W per port.

Bandwidth Scaling & Compliance

  • Aggregation Growth: Core and distribution links must scale from 10 Gbps to 40 Gbps to 100 Gbps over time.

  • MACsec: Layer 2 hardware encryption for compliance and data protection.

  • NetFlow: Provides deep traffic telemetry for network analytics and monitoring.

  • Segmentation: Employs Cisco TrustSec and network virtualization to isolate IoT/IoE endpoints safely.

4. Software-Defined & Automation Platforms

  • Cisco DNA Center (Catalyst Center): Centralized controller using open APIs to automate configuration, policy enforcement, and network assurance.

  • Cisco SD-Access (Software-Defined Access): The campus fabric foundation that unifies wired and wireless networks under a single policy framework (automated onboarding, segmentation, guest access).

  • Cisco SD-WAN: Open, cloud-based overlay managed via the Cisco vManage console to connect Campuses, Data Centers, Branches, and Colocation facilities over any WAN transport.

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