The Cisco Access Layer switches are located at the edge of the network where end devices connect. Services at this layer exist inside each office, remote site, server farm as well as at the enterprise edge.
Physical Thoughts
For the Access Layer we usually use Layer 2 switches, in order to provide access into the network. The access can be over a permanent wired network or through wireless Access Points. One of the main concerns when planning the Access Layer of a new site is the physical location of the switches.
Wiring Closets
Wiring closets can be real closets or telecommunication places that behave as the termination point for infrastructure cabling within sites or within floors of a site. The location and physical size of the wiring closets depends on net size and future growth plans.
The Benefits of Converged Networking
Nowadays computer networks do not include just personal computers and printers. Several different devices can connect to a TCP/IP network, like IP telephones, Video cameras as well as Video conferencing systems. All of these systems can be converged onto a single network. On the other hand, the network that will support them becomes more complicated due to considerations like for example QoS, traffic separation, and filtering. The new sophisticated devices and the associated services, change the required scalability, availability, and security level at the Access Layer.
Necessity for High Availability
For the first networks, high availability was generally present only at the backbone and data center networks. IP telephony simply means that every single telephone should be available 100% of the time. Redundant modules and failover technics can be applied at the Access Layer to increase reliability and availability for the end devices.
Access Layer Management
Improving the manageability is a major concern for all the network architects. Straight forward management is critical due to the increase in the amount and kinds of devices connecting at the Access Layer.
Designing for Manageability
Besides providing connectivity at the Access Layer, the network designer must also consider the following very important factors: 1. Naming structures, 2. VLAN design, 3. Traffic patterns, 4. Prioritization strategies.
Organizing and using network management systems for a big converged network is very essential. Furthermore, it is vital to standardize configurations and network devices when possible.
Following well designed philosophies increases the manageability and on-going support of the network by confirming that the network does not become too complex, making it easier to add new features and services in the future.
Manolis Skoras is a Cisco, Microsoft and HP Certified Trainer and systems-network engineer. Recently he created a CCNA Exam Answers website to help his students and people around the world to better understand the material they will be tested on, thus having greater success rates. Check Certify4Sure today!
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