Exploring the Enterprise
Network Infrastructure
Introducing Routing and Switching in the Enterprise –
Chapter 2
ITE I Chapter 6
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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.
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Interpret Network Documentation
 Network infrastructure diagrams – keep track of the location,
function, & status of devices
 Physical topology map – document location of hosts, networking
devices and media
 Logical topology map – groups hosts by network usage (host
names, addresses, applications)
 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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Other important types of documentation.
 Business Continuity Plan – identify the steps to be
taken to continue in case of disaster
 Business Security Plan – authentication, authorization,
remote access, monitoring
 Network Maintenance Plan
 Service Level Agreement
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ITE 1 Chapter 6
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ITE 1 Chapter 6
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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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Describe the Equipment in the Enterprise NOC
 Server farm
 Data storage
 Storage Area Network (SAN)
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Interpret Network Documentation
 Structured cabling standards
 Main Distribution Facility (MDF)
 Telecommunications room - Intermediate Distribution
Facility (IDF) - contains the Access Layer networking
devices
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 Point-of-Presence (POP)
At the outer edge of the enterprise network
Provides an entry point for services to the enterprise network
Provides links to outside services and sites
 Demarc
Provides a boundary
Designates responsibility for equipment maintenance and
troubleshooting between the service provider (SP) and
customer
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 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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 Connection services
 WAN punchdown block
 Channel Service Unit/Data Service Unit (CSU/DSU)
provide the proper electrical interface and signaling for the
service provider
 Customer Premises Equipment (CPE)
all equipment located within the POP at the customer site
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Identify Router Hardware Characteristics
 Router functions
Provides access to other private networks and the Internet
Provide broadcast containment
Connect remote locations
Group users logically by application or department
Provide enhanced security (using NAT and ACLs)
 Form factors
 Interfaces
 Management options
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Use Router CLI Show Commands
 General Use:
show running-config
show startup-config
show version
 Routing Related:
show ip protocols
show ip route
 Interface Related:
show interfaces
show ip interface brief
show protocols
 Connectivity Related:
show cdp neighbors
show sessions
show ssh
ping
traceroute
ACTIVITY 2.3.2.3
ITE 1 Chapter 6
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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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ITE 1 Chapter 6
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