Logical Network Design (Part II)
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1 Logical Network Design (Part II) DCS COMSATS Institute of Information Technology Rab Nawaz Jadoon Assistant Professor COMSATS IIT, Abbottabad Pakistan Telecommunication Network Design (TND)
2 Possible (Part II) covering Designing a network topology Designing models for addressing and numbering Selecting switching and routing protocols Developing network security strategies Developing network management strategies 2
3 Classic Three-Layer Hierarchical Mode Core layer The core layer provides optimal transport between sites. Distribution layer The distribution layer connects network services to the access layer and implements policies regarding security, traffic loading, and routing. Access layer In a WAN design, the access layer consists of the routers at the edge of the campus networks. In a campus network, the access layer provides switches or hubs for end user access. 3
4 Core layer The core layer of a three-layer hierarchical topology is the high-speed backbone of the internetwork. Because the core layer is critical for interconnectivity, you should design the core layer with redundant components. The core layer should be highly reliable and should adapt to changes quickly. 4
5 Distribution Layer The distribution layer of the network is the demarcation point between the access and core layers of the network. The distribution layer has many roles, including controlling access to resources for security reasons and controlling network traffic. 5
6 Distribution layer The distribution layer allows the core layer to connect sites that run different protocols while maintaining high performance. To maintain good performance in the core, the distribution layer can redistribute between bandwidth-intensive access layer routing protocols and optimized core routing protocols. For example, perhaps one site in the access layer is still running an older protocol, such as IGRP. The distribution layer can redistribute between IGRP at the access layer and EIGRP in the core layer. 6
7 Access Layer The access layer provides users on local segments with access to the internetwork. The access layer can include routers, switches, bridges, shared-media hubs, and wireless access points. 7
8 Redundant Network Design Redundant network designs enable you to meet requirements for network availability by duplicating elements in a network. Redundancy attempts to eliminate any single point of failure on the network. The goal is to duplicate any required component whose failure could disable critical applications. The component could be a core router, a switch, a link between two switches, a channel service unit (CSU), a power supply, a WAN trunk, Internet connectivity, and so on. Redundancy adds complexity to the network topology and to network addressing and routing. 8
9 Backup Paths Redundant Network Design To maintain interconnectivity even when one or more links are down, redundant network designs include a backup path for packets to travel when there are problems on the primary path. A backup path consists of routers and switches and individual backup links between routers and switches, which duplicate devices and links on the primary path. 9
10 Redundant Network Design When estimating network performance for a redundant network design, you should take into consideration two aspects of the backup path: How much capacity the backup path supports. How quickly the network will begin to use the backup path. You can use a network-modeling tool to predict network performance when the backup path is in use. Sometimes the performance is worse than the primary path, but still acceptable. 10
11 Load Sharing Redundant Network Design The primary purpose of redundancy is to meet availability requirements. A secondary goal is to improve performance by supporting load sharing across parallel links. Load sharing, sometimes called load balancing, allows two or more interfaces or paths to share traffic load 11
12 CISCO Safe Architecture SAFE is a reference architecture that network designers can use to simplify the complexity of a large internetwork. With SAFE, you can analyze the functional, logical, and physical components of a network and thus simplify the process of designing an overall enterprise network. 12
13 CISCO Safe Architecture 13
14 Core CISCO Safe Architecture The core stitches together all the other modules. The core is a high-speed infrastructure that provides reliable and scalable Layer 2 and Layer 3 transport Data center The data center hosts servers, applications, and storage devices for use by internal users. The data center also connects the network infrastructure that these devices require, including routers, switches, load balancers, content delivery devices, and application acceleration devices. The data center is not directly accessible from the Internet to the general public. 14
15 Campus CISCO Safe Architecture The campus network provides network access to end users and devices located in a single geographical location. The campus may span several floors in a single building or multiple buildings for larger enterprises. The campus hosts local data, voice, and video services 15
16 Management CISCO Safe Architecture The management network provides monitoring, analysis, authentication, and logging services. WAN edge: The WAN edge is the portion of the network that aggregates WAN links that connect geographically distant branch offices to a central site or regional hub. Internet edge The Internet edge is the infrastructure that provides connectivity to the Internet and that acts as a gateway for the enterprise to the rest of the world. 16
17 Branches CISCO Safe Architecture Branches provide connectivity to users and devices at remote locations. A branch office typically includes one or more LANs and connects to the central site via a private WAN or an Internet connection using VPN technology. Branches host local data, voice, and video services 17
18 Extranet CISCO Safe Architecture An extranet allows selected business partners, customers, and suppliers to access a portion of the network via secure protocols. Extranet services include remote-access VPN. Partner Site Partner sites are networks owned by business partners, customers, and suppliers. They access services in the extra net via secure WAN or Internet connectivity. 18
19 E-Commerce CISCO Safe Architecture The e-commerce module hosts applications, servers, and data used in the selling and buying of products. Teleworker The teleworker module is the home office of a fulltime or part-time employee. Services in the teleworker module include remoteaccess VPN, desktop security, secure wireless networking, IP telephony, and IP video. 19
20 Cisco Sensor Base CISCO Safe Architecture Cisco Sensor Base consists of threat collection servers that receive daily updates from globally deployed sensors regarding threats such as botnets, dark nets, malware, and serial attackers. Sensors include intrusion prevention systems, servers, and web security appliances. 20
21 21
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