Apuntes Ccna Switch

CHAPTER 1
THE PLANNING TASKS OF THE CCNP EXAMS
A professional should be able to perform peer reviews, and been able to check, understand and point weaknesses on another engineer’s model and been able to design documents that can be understood and implemented by less experienced operators.
Cisco uses the prepare, plan, design, implement, operate, optimize (PPDIOO) network lifecycle approach todescribe the life of a network over time

Roles in an IT department (Networking staff)
* Help desk personnel may perform diagnosis of network health, taking a general problem statement from a customer down to a specific issue (for example, that a user’s device is not responsive or reachable).
* Operations staff may be the second level of support for problems, both reacting to calls fromthe help desk and monitoring the network proactively. The operations staff also often implements changes on behalf of the engineering team during offshift hours.
* The network engineering team may be the third level of support for problems, but they typically focus on project work, including the detailed planning for new configurations to support new sites, new network features, and new sitesin the network.
* The network designers may actually log in to the network devices much less than the operations and engineering teams, instead focusing on gathering requirements from internal and exte rnal customers, translating those requirements into a network design, and even doing proof-of-concept testing—but leaving the details of how to deploy the design for all required sites to thenetwork engineering team
The Design Step
The network designer first develops the requirements and creates a plan. That plan typically lists the following:
■ Project requirements
■ Sites affected
■ Sample configurations
■ Traffic analysis
■ Results from proof-of-concept testing
■ Dependencies and assumptions
■ Business requirements, financials, management commitments

Many other itemsmight also be included.
The network designer often uses a peer review process to refine and confirm the design.
Implementation Planning Step
The network engineer must interpret the example and general cases described in the design document, and develop a very specific implementation plan that lists all significant tasks and actions by each group and on each device
For example, a company mightplan to deploy IP telephony across a campus network. The design document might list the following basic requirements:
■ Specific switch models with Power over Ethernet (PoE) at each remote office
■ The convention of placing all phones at a site in one VLAN/subnet, and all PCs in a second VLAN/subnet
■ VLAN trunking between the access layer switches and the distribution switches
■ A particularCatalyst IOS software version and feature set
■ High availability features designed to provide maximum uptime for telephone calls
■ QoS policies that give voice traffic premium treatment over other types of traffic

After a thorough review of the design, the network engineer then develops an implementation plan that includes items such as the following:
■ A list of all campus locations, withnotations of which require a switch hardware upgrade (for PoE support) and which do not
■ Total numbers of switches to be ordered, prices, and delivery schedules
■ A table that lists the specific VLANs and subnet numbers used at each location for the phone and PC VLANs and subnets
■ The IP address ranges from each subnet that needs to be added to the DHCP servers configurations for dynamic addressassignment
■ A list of the switches that require a Catalyst IOS software upgrade
■ Annotated sample configurations for typical access layer switches, including VLAN trunking, high availability, and QoS configuration commands

Verification Planning Step

The design step tells us “this is what we want to accomplish,” whereas the implementation planning step tells us “this is exactly what we...