Please enable JavaScript.
Coggle requires JavaScript to display documents.
Module 11: Network Design - Coggle Diagram
Module 11: Network Design
11.1. Hierarchical networks
Unlimited Switched Networks
It enables organizations to support a borderless network that can connect to anyone, anywhere, anytime, on any device, securely, reliably and seamlessly.
Hierarchy in Unlimited Switched Networks
The creation of an unbounded switched network requires the use of sound network design principles to ensure maximum availability, flexibility, security and ease of administration.
11.2. Scalable Networks
Design for Scalability
The network must be able to change along with its users. Scalability defines a network that can grow without losing availability and reliability.
Planning for redundancy
Redundancy is an important part of network design. It can prevent disruptions to network services by minimizing the possibility of a single point of failure.
Increase bandwidth
EtherChannel allows the administrator to increase bandwidth between devices by creating a logical link composed of several physical links.
Expansion of the access layer
The network must be designed to be able to expand network access to people and devices as needed. For the extension of access layer connectivity, wireless connectivity is becoming increasingly important.
Routing Protocol Enhancements
OSPF routers establish and maintain adjacencies with connected neighboring OSPF routers. OSPF routers synchronize their link-state database.
11.3 Switch Hardware
11.3.1 Switch Platforms
One simple way to create hierarchical and scalable networks is to use the right equipment for the job. There is a variety of switch platforms, form factors, and other features that you should consider before choosing a switch.
11.3.2 Switch Form Factors
Fixed configuration switches
Features and options on fixed configuration switches are limited to those that originally come with the switch.
Modular configuration switches
The chassis on modular switches accept field-replaceable line cards.
Stackable configuration switches
Special cables are used to connect stackable switches that allow them to effectively operate as one large switch.
Thickness
The thickness of the switch, which is expressed in the number of rack units, is also important for switches that are mounted in a rack.
11.3.3 Port Density
11.3.4 Forwarding Rates
Forwarding rates define the processing capabilities of a switch by rating how much data the switch can process per second. Switch product lines are classified by forwarding rates. Entry-level switches have lower forwarding rates than enterprise-level switches.
11.3.5 Power over Ethernet
Switch
PoE ports look the same as any other switch port. Check the model of the switch to determine if the port supports PoE.
IP Phone
WAP
PoE ports on wireless access points look the same as any other switch port. Check the model of the wireless access point to determine if the port supports PoE.
Cisco Catalyst 2960-C
The Cisco Catalyst 2960-C and 3560-C Series compact switches support PoE pass-through. PoE pass-through allows a network administrator to power PoE devices that are connected to the switch, as well as the switch itself, by drawing power from certain upstream switches.
11.4 Router Hardware
11.4.1 Router Requirements
Routers also serve other beneficial functions as follows:
They provide broadcast containment by limiting broadcasts to the local network.
They interconnect geographically separated locations.
They group users logically by application or department within a company, based on common needs or requiring access to the same resources.
They provide enhanced security by filtering unwanted traffic through access control lists.
11.4.2 Cisco Routers
Branch Routers
Branch routers, shown in the figure, optimize branch services on a single platform while delivering an optimal application experience across branch and WAN infrastructures
Network Edge Routers
Network edge routers, shown in the figure, enable the network edge to deliver high-performance, highly secure, and reliable services that unite campus, data center, and branch networks.
Service Provider Routers
Service provider routers, shown in the figure, deliver end-to-end scalable solutions and subscriber-aware services
Industrial
Industrial routers, such as the ones shown in the figure, are designed to provide enterprise-class features in rugged and harsh environments.
11.4.3 Router Form Factors
Cisco 900 Series
This is a small branch office router. It combines WAN, switching, security, and advanced connectivity options in a compact, fanless platform for small and medium-sized businesses.
Cisco ASR 9000 and 1000 Series Aggregation Services Routers
These routers provide density and resiliency with programmability, for a scalable network edge.
Cisco Network Convergence System 5500 Series Routers
These routers are designed to efficiently scale between large data centers and large enterprise networks, web, and service provider WAN and aggregation networks.
Cisco 800 Industrial Integrated Services Router
This router is compact and designed for harsh environments.
