Now that you have completed this
chapter, you should have a firm understanding of the following:
- Frame Relay WAN technology provides
a flexible method of connecting LANs over Frame Relay WAN links.
- Frame Relay provides a
packet-switching data communication capability that is used across
the interface between user devices (such as routers, bridges, and
host machines) and network equipment (such as switching nodes).
- Frame Relay uses virtual circuits to
establish connections across the WAN.
The main functions of the LMI process
are:
- Determine the operational status of
the various PVCs that the router knows about
- Transmit keepalive packets to ensure
that the PVC stays up and does not shut down due to inactivity
- Tell the router what PVCs are
available
- The Inverse ARP mechanism allows the
router to automatically build the Frame Relay map
- The router next-hop address
determined from the routing table must be resolved to a Frame
Relay DLCI
Frame Relay can divide a single
physical WAN interface into multiple subinterfaces.
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Threaded
Case
Study |
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Washington
School District Project Task: Frame Relay
In
this chapter, you have learned concepts and
configuration processes that will help you
implement a Frame Relay data link in the
Washington School District network. You will
design and implement the Frame Relay link to
the Internet per the TCS Overview.
This is the final step in the district network
implementation. As part of the configuration
and implementation, you need to complete the
following tasks:
- Describe
how Frame Relay will be inserted in the
WAN implementation, what speed will be
required, and the benefits of Frame Relay.
- Document
the insertion of Frame Relay in the WAN
implementation, including:
- DLCI
numbers
- The
value of the CIR
- A
description of all data communication
equipment needed to accomplish
implementation
- Document
the router commands needed to implement
Frame Relay on the firewall router and how
the router configuration changes.
- Apply
the CCNA Certification Exam Learning
Objectives to your specific design. This
will require a paragraph on how the
learning objectives relate to your design.
Learning objectives can be grouped
together for the purpose of explanation.
In this way, you will be studying for
their CCNA Certification Exam as you work
through the case study.
CCNA
Certification Exam Learning Objectives
(*** are explicit CCNA Exam objectives;
unmarked are knowledge assumed by the exam):
General
- Describe
at what layer of a hierarchical WAN model
an ISDN link should be installed
OSI
Model
- Describe
what layers of the OSI model Frame Relay
standards address and their
functions at these layers.
Frame
Relay
- Describe DLCI's and their functions in a Frame Relay implementation.
- Describe LMI's and their function in a Frame Relay implementation.
- Describe a 'Permanent Virtual Circuit'.
- Describe
connection-oriented network service and
connectionless network service, and
identify the key differences between
them***
- Describe 'Committed Information Rate' (CIR) and its function.
- Describe 'Forward Explicit Congestion Notification' (FECN) and its function.
- Describe 'Backward Explicit Congestion Notification' (BECN) and its function
- Describe 'Discard Eligibility' (DE) and its function.
- Recognize
key Frame Relay terms and features***
- List
commands to configure Frame Relay LMIs,
maps, and subinterfaces***
- List
commands to monitor Frame Relay operation
in the router***
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