GOAL OF CCNP EXAM
■ Read design goals extracted from a design document, develop a configuration that meets those goals, and discover missing information that needs to be gathered before you can complete the configuration.
■ Read an extract from the design and implementation plans to determine what is wrong or missing
.■ Read a configuration and design goal stated as being correct and create the verification steps to confirm whether the feature works
.■ Analyze an extract from a verification plan, along with the stated configuration and design goals, and determine any problems or missing elements in the verification plan.
IT JOB ROLE IN COMPANIES
■ L1 SUPPORT : 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).
■ L2 SUPPORT :Operations staff may be the second level of support for problems, both reacting to calls from the help desk and monitoring the network proactively. The operations staff also often implements changes on behalf of the engineering team during offshift hours.
■ L3 SUPPORT : 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 sites in 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 external 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 the network engineering team.
Summary of the Role of Network Engineers
■ Does not create the design document
■ Does participate in design peer reviews, finding oversights, asking further questions
that impact the eventual implementation, and confirming the portions of the design
that appear complete and valid
■ Does plan and document the specific configurations for each device, documenting
those configurations in the implementation plan so that others can add the configuration
to various devices
■ Does participate in peer reviews of the implementation plans written by fellow network
engineers, finding omissions, caveats, and problems.
■ Does create the verification plan that others use to verify that the changes worked as
planned when implemented off-shift
■ Does perform peer reviews of other engineers’ verification plans
■ Does verify that the changes worked as planned when implemented
PPDIOO
The Design Step
Next, consider the basic work flow when a new network project happens, new sites are
added, or any noticeable change occurs. 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
Implementation Planning Step
■ 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 particular Catalyst 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
■ A list of all campus locations, with notations 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 address assignment
■ 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
■ After copy/pasting or entering the configuration changes in a switch, use the show
interfaces status command to confirm connected devices and their speed and duplex
modes.
■ Use the show cdp neighbor command to verify active Cisco IP Phone identities.
■ Use the show mac-address-table dynamic interface command to verify the MAC addresses
of Cisco IP Phones and connected PCs.
■ Observe the IP Phone display to confirm that the phone has obtained an IP address
and has downloaded its firmware.
■ Make test calls from IP Phones.
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