Cisco 3 Chapter 1-4 Reviewer

Topics: Ethernet, Network switch, OSI model Pages: 8 (1870 words) Published: August 9, 2012
1. Access layer is to provide a means of connecting devices to the network and controlling which devices are allowed to communicate on the network. 2. The distribution layer controls the flow of network traffic using policies and delineates broadcast domains by performing routing functions between virtual LANs (VLANs) defined at the access layer. 3. The core layer of the hierarchical design is the high-speed backbone of the internetwork. The core layer is critical for interconnectivity between distribution layer devices, so it is important for the core to be highly available and redundant. 4. Benefits of Hierarchical Network:

* Scalability – can be expanded easily
* Redundancy - Redundancy at the core and distribution level ensure path availability * Performance –Link aggregation between levels and high-performance core and distribution level switches allow for near wire-speed throughout the network. * Security – Port security at the access level and policies at the distribution level make the network more secure. * Manageability – Consistency between switches at each level makes management more simple * Maintainability – The modularity of hierarchical design allows network to scale without becoming overly complicated. 5. Network diameter is the number of devices that a packet has to cross before it reaches its destination. 6. Bandwidth aggregation is the practice of considering the specific bandwidth requirements of each part of the hierarchy. 7. Link aggregation allows multiple switch port links to be combined so as to achieve higher throughput between switches. 8. A Converged Network is one where voice and video communications have been combined on a single data network. 9. Traffic Flow Analysis is the process of measuring the bandwidth usage on a network and analyzing the data. 10. User community analysis is the process of identifying various groupings of users and their impact on network performance. 11. Data Stores and Data Servers Analysis - consider where the data stores and servers are located so that you can determine the impact of traffic on the network. 12. Topology diagram is a graphical representation of a network infrastructure 13. Fixed configuration switches are just as you might expect, fixed in their configuration. What that means is that you cannot add features or options to the switch beyond those that originally came with the switch 14. Modular switches offer more flexibility in their configuration. Modular switches typically come with different sized chassis that allow for the installation of different numbers of modular line cards. 15. Stackable switches can be interconnected using a special backplane cable that provides high-bandwidth throughput between the switches 16. When selecting a switch for the access, distribution, or core layer, consider the ability of the switch to support: * Port Density. - is the number of ports available on a single switch. * Forwarding Rate. - Defines the processing capabilities of a switch by rating how much data the switch can process per second * Bandwidth Aggregation Requirements - you should determine if there are enough ports on a switch to aggregate to support the required bandwidth

17. Two other characteristics you want to consider when selecting a switch are * Power over Ethernet (PoE) - Allows the switch to deliver power to a device over the existing Ethernet cabling * Layer 3 functionality - Switches typically operate at Layer 2 of the OSI Model. 18. Access layer switch features.

* Port Security
* Link Aggregation
* PoE
* FastEthernet/Gigabit
* Quality of Service (QoS)
19. Distribution layer switch features.
* Layer 3 Support
* Link Aggregation
* High Forwarding Rate
* Redundant Components
* Gigabit/10 Gigabit
* Quality of Service (QoS)
* Security Policies
20. Core layer switch features
* Layer...
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