Download Discovery_Routing_Switching_Chapter2

Exploring the Enterprise
Network Infrastructure
Introducing Routing and Switching in the Enterprise –
Chapter 2
Version 4.0
© 2006 Cisco Systems, Inc. All rights reserved.
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Objectives
 Interpret network documentation.
– Describe the equipment in the enterprise Network
Operations Center.
 Explain the importance of the enterprise edge in the
provisioning of services.
– Describe the Point-of-Presence for service delivery.
– Identify security considerations and equipment at the
enterprise edge.
 Identify router and switch hardware characteristics and
use router CLI configuration and verification commands.
 Show the Enterprise Network Infrastructure Movie
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Network Documentation
 Why is it important
that we have accurate
network
documentation?
 Whose responsibility
is it to ensure that the
network
documentation is up
to date and accurate?
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Get lost much?
 Anyone who has trusted
a GPS to explore an
unfamiliar area knows the
importance of accurate
maps.
 Imagine what it would be
like to follow the GPS
directions in an unfamiliar
area late at night, only to
be suddenly confronted
by a road closure and not
know what to do next.
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Interpret Network Documentation
 Network infrastructure diagrams- usually linked to a
database
 Physical topology map - floorplans
 Logical topology map – ip and interface labels
 Control plane information: failure domains
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Interpret Network Documentation
 Floor plans and blueprints
 Redlining shows changes
 As-built diagram documents changes from original
plans
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Interpret Network Documentation
 Business Continuity Plan
 Business Security Plan
 Network Maintenance Plan
 Service Level Agreement
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Describe the Equipment in the Enterprise NOC
 Raised floors
 High performance UPS and HVAC
 Fire suppression systems
 Network monitoring equipment
 MDF switches and routers
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Data Centers
 What is a Data
Center?
 Whose responsibility
is it to ensure that the
network is up and
available?
http://www.cisco.com/web/about/ciscoitatwork/data_center/flash/rcdn_dc_tour/index.html
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Describe the Equipment in the Enterprise NOC
 Server farm
 Data storage
 Storage Area Network (SAN)
Reflection: Google “Virtual Tours of Network
Operations Centers” and visit three…
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Interpret Network Documentation
 Structured cabling standards
 Main Distribution Facility (MDF)
 Telecommunications room
 Intermediate Distribution Facility (IDF)
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NAS v.s. SAN Activity
 The latest trend in storage is the Storage Area Network
SAN. What is the difference between a NAS and an
SAN? What advantages does a SAN offer a network
administrator over a NAS? Let’s research and find out.
 Pretend that your boss, the Chief Information Officer for
XYZ Corporation, has asked you to select a NAS or
SAS for storage as the company prepares for
expansion. Your job is to prepare a one page sales
pitch for their CIO on the differences between an NAS
and SAS and their recommendation for making the
selection.
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NAS v.s. SAN Activity
 1. Begin by conducting an Internet search using the
phrase "NAS versus SAN". This will result in a list of
resources that detail the meaning of both of these
terms as well as examples.
 2. Define the storage need for XYZ Corporation. You
will need to define the need in order to select from the
two storage choices.
 3. After conducting the research on NAS versus SAN
for network storage and defining their storage need,
prepare a five-minute sales pitch to you (the CIO) on
the selection of an NAS or SAS to meet network
storage needs.
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The Importance of the Enterprise Edge in the
Provisioning of Services
 Point-of-Presence (POP)
 Demarc – the point that separates maint. responsibility
 Links to outside services and sites
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The Importance of the Enterprise Edge in the
Provisioning of Services
 Security considerations at the enterprise edge
– Denial of Service (DoS) attacks
– Application of filtering policies
 Firewall
 Demilitarized zone
 Intrusion detection and
prevention
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The Importance of the Enterprise Edge in the
Provisioning of Services
 Connection services
 WAN punchdown block
 Channel Service Unit/Data Service Unit (CSU/DSU)
 Customer Premises Equipment (CPE)
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Wireless Points-of-Presence
 A growing sector of business, representing a growth
area for ISPs and new opportunities for network
administrators. In this activity you will explore the new
opportunities presented by wireless POPs.
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Identify Router Hardware Characteristics
 Router functions
 Form factors
 Interfaces
 Management options
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Functions of Routers
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Routers allow packets to leave the local
network
 How does a router know that a packet is intended for
the local network?
 How does a router know that a packet is intended for
an external network?
 What portion of the IP address is used to route
packets?
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Routers can select alternate routes
 Routers can select alternate routes if a link goes down
or traffic is congested.
 What is the process that routers follow in developing
routing tables?
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Routers also provide
 Broadcast containment - What is a broadcast
message? What issues do network administrators
struggle within the use of broadcast messages?
 Connection to remote locations.
 Grouping of users logically by application or
department. How does a router achieve these two
functions?
 Enhanced security (using NATs and ACLs).
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Router Management
Show the Access the Router Movie
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Use Router CLI Show Commands
 General use
 Routing related
 Interface related
 Connectivity related
 Review section
2.3.2.2 – key
configuration
commands are
reviewed in detail.
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Use Basic Router Configuration Commands
 Configuration management
 Global settings
 Line settings
 Interface settings
 Routing settings
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Identify Switch Hardware Characteristics
 Switch functions
 Form factors
 Port density
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Use Switch CLI Show Commands
 General use
 Interface/port related
 Connectivity related
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Use Switch CLI Configuration Commands
 Configuration management
 Global settings
 Interface settings
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Summary
 Network infrastructure diagrams document devices in a
network
 The enterprise NOC manages and monitors all network
resources
 The enterprise edge provides Internet and local access
services and security against attacks
 Access Layer switches provide end user connections,
security services, and microsegmentation of collision
domains
 Distribution Layer routers control broadcasts and move
packets between locations and the Internet
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