cisco network design models

The Cisco Enterprise Architecture model facilitates the design of larger, more scalable networks. The architecture divides the network into functional network areas and modules. Table 2-2 summarizes the hierarchical layers. This Solution Reference Network Design (SRND) guide provides system-level design models, recommendations, and guidelines for deploying collaboration solutions using Cisco Collaboration System Release (CSR) 10.x. This sample shows a diagram depicting a LAN fault-tolerance system. (Select three. Teleworkers also obtain local Internet access. Cisco suggests a Three−Tier (Three Layer) hierarchical network model, that consists of three layers: the Core layer, the Distribution layer, and the Access layer. A hop-based routing protocol does load balancing over unequal-bandwidth paths as long as the hop count is equal. The switches operating at core layer switches packets as fast as possible. Better management & troubleshooting: Cisco Three Layer Network Model allows better network management and isolate causes of network trouble. Cisco Network Examples and Templates. Cisco suggests a Three−Tier (Three Layer) hierarchical network model, that consists of three layers: the Core layer, the Distribution layer, and the Access layer. Cisco. Devices located in the e-commerce submodule include the following: Web and application servers: Primary user interface for e-commerce navigation, Database servers: Contain the application and transaction information, Firewall and firewall routers: Govern the communication between users of the system, Network intrusion prevention systems (IPS): Provide monitoring of key network segments in the module to detect and respond to attacks against the network, Multilayer switch with IPS modules: Provide traffic transport and integrated security monitoring. im trying to create a project in packet tracer using switch, hub,routers and other nodes. The eight-question quiz, derived from the major sections in the “Foundation Topics” portion of the chapter, helps you determine how to spend your limited study time. Do some investigative work to ensure that your backup really is acting as a backup. design a network model. This section identifies enterprise architecture modules that are commonly found in medium-to-large organizations. Which layer performs Active Directory and messaging? Because Cisco switches implement the IEEE 802.1d spanning-tree algorithm, you can avoid this looping in Spanning Tree Protocol (STP). Because WAN links are often critical pieces of the internetwork, WAN environments often deploy redundant media. If Router A goes offline, Router B takes over as the active router, continuing the delivery of the workstation’s packets. For small office/home office (SOHO) environments, the entire hierarchy collapses to interfaces on a single device. Improves application response times by using faster servers. It is also possible to configure distribution functions in a multilayer building access device to maintain the focus of the campus backbone on fast transport. The remote modules of the Cisco Enterprise Architecture model are the enterprise branch, enterprise data center, and enterprise teleworker modules. With VSS, the physical topology changes as each access switch has a single upstream distribution switch versus having two upstream distribution switches. IP load balancing in a Cisco router depends on which switching mode the router uses. When a network uses routers, the number of router hops from edge to edge is called the diameter. It is also referred as the backbone. LACP helps protect against Layer 2 loops that are caused by misconfiguration. ), Function as a hub for wireless end devices, Function as a Layer 3 switch for wireless end devices, Provide physical connectivity for wireless end devices, Filter out interference from microwave devices, In which ways does application network services help resolve application issues? These and other WAN technologies are described in Chapter 6. It bonds multiple WAN links into a single logical channel. Remote offices, mobile users, and home offices access the Internet using the local SP with secured IPsec tunnels to the VPN/remote access submodule via the Internet submodule. Each layer provides necessary functionality to the enterprise campus network. Small campus locations likely have a two-tier design with a wiring-closet component (Ethernet access layer) and a backbone core (collapsed core and distribution layers). In mission-critical applications, it is often necessary to provide redundant media. ISPs offer enterprises access to the Internet. Functions of the access layer include the following: QoS classification and marking and trust boundaries, Address Resolution Protocol (ARP) inspection, Power over Ethernet (PoE) and auxiliary VLANs for VoIP. Download design guides, deployment guides, and technical white papers in the Cisco DNA Design Zone. As shown in Figure 2-16, mobile users connect from their homes, hotels, or other locations using dialup or Internet access lines. Modular Design (1.2.1.1) While the hierarchical network design works well within the campus infrastructure, networks have expanded beyond these borders. Different carriers sometimes use the same facilities, meaning that your backup path might be susceptible to the same failures as your primary path. Components of this submodule include the following: Firewall and firewall routers: Provide protection of resources, stateful filtering of traffic, and VPN termination for remote sites and users, Internet edge routers: Provide basic filtering and multilayer connectivity, FTP and HTTP servers: Provide for web applications that interface the enterprise with the world via the public Internet, SMTP relay servers: Act as relays between the Internet and the intranet mail servers, DNS servers: Serve as authoritative external DNS servers for the enterprise and relay internal requests to the Internet. Which layer performs port security and DHCP snooping? ISPs can route the enterprise’s networks to their network and to upstream and peer Internet providers. IP phone capabilities are also provided in the Cisco Virtual Office solution, providing corporate voice services for mobile users. Remote access to the central corporate network is through traditional WAN technologies such as ISDN, Frame Relay, and leased lines. Branch offices obtain local Internet access from an ISP. The data center components include the following: Network infrastructure: Gigabit and 10 Gigabit Ethernet, InfiniBand, optical transport, and storage switching, Interactive services: Computer infrastructure services, storage services, security, and application optimization, DC management: Cisco Fabric Manager and Cisco VFrame for server and service management, The enterprise data center is covered in detail in Chapter 4, “Data Center Design.”. It is common now for the SP to have their ISP router at the customer site and provide Ethernet access to the customer. Use the following guidelines when designing the enterprise edge: Determine the connection needed to connect the corporate network to the Internet. You can select the sub shapes to fill or change its shape. All rights reserved. CCDA 200-310 Official Cert Guide, 5th Edition, $47.99 Option 3 provides link and local router redundancy but does not provide for an ISP failure. GLBP members communicate between each other through hello messages sent every three seconds to the multicast address 224.0.0.102, User Datagram Protocol (UDP) port 3222. Figure 2-13 shows the WAN module connecting to the Frame Relay SP edge. The enterprise edge routers in the WAN module connect to the SP’s Frame Relay switches. All the symbols can be recolored. Figure 2-12 shows a VPN design. It is a two-layer hierarchy used with smaller networks. Which are two benefits of using a modular approach? The virtual router backup assumes the forwarding responsibility for the virtual router should the master fail. It can compress, cache, and optimize content. In most instances, large campus locations have a three-tier design with a wiring-closet component (building access layer), a building distribution layer, and a campus core layer. ), Which are the three layers of the hierarchical model? Cisco Three Layer / Three-tier Hierarchical Network Model. Design techniques are the same as those described for these modules. The distribution layer can have many roles, including implementing the following functions: Policy-based connectivity (for example, ensuring that traffic sent from a particular network is forwarded out one interface while all other traffic is forwarded out another interface), Address or area aggregation or summarization, Media translations (for example, between Ethernet and Token Ring), Redistribution between routing domains (for example, between two different routing protocols), Demarcation between static and dynamic routing protocols. Example 3. Examples of Cisco Network Diagram Edraw includes lots of Cisco network symbols. > Core switches running at that main In this section, you will learn about the access, distribution, and core layers and their role in … VPNs reduce communication expenses by leveraging the infrastructure of SPs. This is probably the most basic model ever known, and Cisco even developed its network in accordance with this model. Supported on Catalyst 4500, 6500, and 6800 switches. Create the e-commerce module for customers and partners that require Internet access to business and database applications. Path: Design Technology: Network Security Area: Access and Identity Management Vendor: Cisco Software: 1.X, 2.X Platform: ISE Physical Appliance, ISE Virtual Appliance Cisco Identity Services Engine helps to concentrate all enterprise network identity policies in one place. VSS can be used with Catalyst 6500 switches to overcome this limitation. The hub-and-spoke design, illustrated in Figure 2-5, also scales better and is easier to manage than ring or mesh topologies. Dividing (or breaking) the network design into layers enables each layer to implement specific functions. Routers in the enterprise WAN provide WAN access, QoS, routing, redundancy, and access control to the WAN. A well-connected partial-mesh network provides every router with links to at least two other routing devices in the network. For example, in a brokerage firm where traders must access data to buy and sell stocks, two or more redundant servers can replicate the data. The section “High Availability Network Services” covers availability models. RFC 5768 defined VRRPv3 for both IPv4 and IPv6 networks. Multiple links across multiple devices provides better redundancy. For example, it is common to use Internet VPNs to back up primary MPLS links in today’s networks. The server farm or data center provides high-speed access and high availability (redundancy) to the servers. Option 4 provides for full redundancy of the local router, links, and ISPs. The hierarchical network design model breaks the complex flat network into multiple smaller and more manageable networks. Implement the security policy and configure authentication and authorization parameters. Cisco Safe Design Icons. The second document, High Availability Campus Recovery Analysis, provides extensive test results showing the convergence times for the different topologies described in this document, and is available at the following website: http://www.cisco.com/en/US/docs/solutions/Enterprise/Campus/HA_recovery_DG/campusRecovery.ht… Software-Defined Access - Solution Design Guide. The building distribution layer aggregates all the closet access switches and performs access control, QoS, route redundancy, and load balancing. computer network student and i have been given an assignment to prepare a network with around 20 clients. Simplified management of a single configuration of the VSS distribution switch. Better return on investment (ROI) via increased bandwidth between the access layer and the distribution layer. Hence, two 10GE ports become 20 Gbps of bandwidth when they are bundled. This architecture model separates network design into more manageable modules. The drawback is that you have no redundancy or failover if the circuit fails. The core layer should have the following characteristics: Avoidance of CPU-intensive packet manipulation caused by security, inspection, quality of service (QoS) classification, or other processes. The algorithm permits redundant paths that are automatically activated when the active path experiences problems. http://www.howtonetwork.com/courses/cisco/cisco-ccda/ - Video training course for the Cisco CCDA exam. Makes the network harder since there are many submodules to use, Provides better performance and network scalability, Prepares the network for IPv6 migration from IPv4, Secures the network with access filters in all layers. You implement high availability models at the access layer. © 2021 Pearson Education, Cisco Press. WAN SPs offer MPLS, Frame Relay, ATM, and other WAN services for enterprise site-to-site connectivity with permanent connections. Which are key features of the distribution layer? Depending on the convergence time of the routing protocols, a single link failure cannot have a catastrophic effect. The change is transparent to the workstation. Infrastructure at the remote site usually consists of a WAN router and a small LAN switch, as shown in Figure 2-15. ), Which are borderless networks infrastructure services? Table 2-1 outlines the major topics discussed in this chapter and the “Do I Know This Already?” quiz questions that correspond to those topics. WAN technologies include the following: Synchronous Optical Network (SONET) and Synchronous Digital Hierarchy (SDH). The purpose of this layer is to provide boundary definition by implementing access lists and other filters. VRRP is a router redundancy protocol defined in RFC 3768. The Cisco Enterprise Architecture is a modular approach to network design. Smaller networks can “collapse” multiple layers to a single device with only an implied hierarchy. The typical hierarchical design model is broken up in to three layers: Access, Distribution and Core. Which section(s) belong(s) to the distribution layer? When planning redundancy, follow guidelines for simple, hierarchical design. GLBP protects data traffic from a failed router or circuit, such as HSRP, while allowing packet load sharing between a group of redundant routers. Enterprise servers such as file and print servers, application servers, email servers, Dynamic Host Configuration Protocol (DHCP) servers, and Domain Name System (DNS) servers are placed in the server farm. VPN clients are used to allow mobile users to securely access enterprise applications. The simplest form is to have a single circuit between the enterprise and the SP, as shown in Figure 2-10. Figure 2-7 shows the Cisco Enterprise Architecture model. The core layer is the network’s high-speed switching backbone that is crucial to corporate communications. It removes STP and negates the need for Hot Standby Router Protocol (HSRP), Virtual Router Redundancy Protocol (VRRP), or Gateway Load Balancing Protocol (GLBP). After the slower link becomes saturated, packet loss at the saturated link prevents full utilization of the higher-capacity links; this scenario is called pinhole congestion. (Choose two. Route summarization is configured on interfaces toward the core layer. Cisco's fixed and modular, core, distribution, and LAN access switches have been designed for the era of intent-based networking. Which topology allows for maximum growth? To support load balancing, keep the bandwidth consistent within a layer of the hierarchical model so that all paths have the same cost. Figure 2-7 Cisco Enterprise Architecture model. Cisco Modeling Labs is our premier platform for network simulation. Copyright © 2008 - 2021 OmniSecu.com. Option 2 provides link and ISP redundancy but does not provide redundancy for a local router failure. Better Filter/Policy creation and application: Cisco Three Layer Network Model allows better filter/policy creation application. 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( redundancy ) to the enterprise campus architectures, components, and optimize.! Links, learn as much as possible that devices may be in more than one layer even! Vss solves the STP looping problem by converting the distribution layer a on. Between access and high availability designs of the local router redundancy but does not provide for an ISP design. That packets are properly routed between subnets and VLANs in your enterprise s an example in... Noted, it is a two-layer hierarchy used with smaller networks against 2. Have no redundancy or failover for Internet service have Internet as well as intranet connection 1 provides link ISP... Figure 2-1 hierarchical network design by intent and informed by context, security. Planning redundancy, and services for first-hop load balancing, redundant routes has purposes. Our open, software-driven approach to deploy a digital-ready network option 4 provides for full redundancy of the network! 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