CCNA Dis3 - Chapter 2 - Exploring the Enterprise Network Infrastructure_ppt [Compatibility Mode]
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Transcript of CCNA Dis3 - Chapter 2 - Exploring the Enterprise Network Infrastructure_ppt [Compatibility Mode]
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Chapter 2 Exploring the EnterpriseNetwork Infrastructure
CCNA Discovery 4.0
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Intruduction
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Intruduction
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Intruduction
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Intruduction
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Objectives
Interpret network documentation.
Describe the equipment in the enterpriseNetwork Operations Center.
Describe the Point-of-Presence for Servicedelivery.
Indentify security considerations and
equipment at the enterprise edge. Identify router and switch hardwarecharacteristics and use router CLI
configuration and verification commands
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Describing thecurrent network
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Enterprise Network Documentation
A physical topology map uses icons to document thelocation of hosts, networking devices, and media.
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Enterprise Network Documentation
A logical topology map groups hosts by network usage,regardless of physical location.
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Enterprise Network Documentation
As the network grows or changes however, thedocumentation is not always updated.
Blueprints can be marked up, or redlined, to show thechanges.
The modified diagram is known as an as-built
An as-built diagram
documents how a
network was actually
constructed which
may differ from the
original plans.
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Enterprise Network Documentation
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Enterprise Network Documentation
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Network Operations Center (NOC)
Most enterprise networks have a Network OperationsCenter (NOC) that allows for central management andmonitoring of all network resources.
NOC is sometimes referred to as a Data Center
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Network Operations Center (NOC)
NOCs also provide centralized resources such as serversand data storage.
Servers in the NOC are usually clustered together,creating a server farm.
The Server Farm is a single resource but, in fact,provides two functions:Backup.
Load Balancing.
The servers in the farm may berack-mounted and interconnected by
very high-speed switches
(Gigabit Ethernet or higher).
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Network Operations Center (NOC)
Data Storage or Network Attached Storage (NAS) Groups large numbers of disk drives that are directly
attached to the network and can be used by any server.
A NAS device is typically attached to an Ethernet network
and is assigned its own IP address. A more sophisticated version of NAS is Storage Area
Network (SAN).
A SAN is a high-speed network thatinterconnects different types of data
storage devices over a LAN or WAN.
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Network Operations Center (NOC)
Equipment in the enterprise NOC is usually mounted inracks.
In large NOCs, racks are usually floor-to-ceiling mountedand may be attached to each other.
The most common rack width is 19inches (48.26 cm). The vertical space that the
equipment
occupies is measured inRack Units (RUs).
A Unit equals 1.75 inches (4.4cm). For example, a 2U chassis
is 3.5 inches (8.9 cm) high.
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Network Operations Center (NOC)
In an enterprise NOC, thousands of cables may enterand exit the facility.
Structured cabling creates an organized cabling systemthat is easily understood by installers, networkadministrators, and any other technicians who work withcables.
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Telecommunication Room Design andConsiderations
In practice, however, most users connect to a switch in atelecommunications room, which is some distance fromthe NOC.
The telecommunications room is also referred to as awiring closet or intermediate distribution facility (IDF).
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Telecommunication Room Design andConsiderations
Many IDFs connect to a Main Distribution Facility (MDF)using an extended star design.
The MDF is usually located in the NOC or centrallylocated within the building.
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Telecommunication Room Design andConsiderations
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Telecommunication Room Design andConsiderations
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Supporting theEnterprise Edge
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Service Provider at the Point-of-Presence
At the outer edge of the enterprise network is the Point-of-Presence, or POP, which provides an entry point forservices to the enterprise network.
Externally-provided services coming in through the POPinclude Internet access, wide area connections, andtelephone services (PSTN).
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Security Considerations at the EnterpriseEdge
The edge is the point of entry for outside attacks and is apoint of vulnerability
For example, Denial of Service (DoS) attacks. An organization can deploy a firewall , and security
appliances with intrusion detection system (IDS) andintrusion prevention system (IPS) at the edge to protectthe network.
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Connecting the Enterprise Network toExternal Services
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Connecting the Enterprise Network toExternal Services
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Revieving Routingand Switching
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Router Hardware
One important device in the Distribution Layer of anenterprise network is a router.
All hosts on a local network specify the IP address of thelocal router interface in their IP configuration.
This router interface is the default gateway.
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Router Hardware
Two methods exist for connecting a PC to a networkdevice for configuration and monitoring tasks: out-of-band and in-band management.
Out-of-band management is used
for initial configuration or when anetwork connection is unavailable.
Configuration using out-of-band
management requires:
Direct connection to console orAUX port
Terminal emulation client
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Router Hardware
In-band management is used to monitor and makeconfiguration changes to a network device over anetwork connection.
Configuration using in-band management requires:
At least one network interfaceon the device to be connected
and operational
Telnet, SSH, or HTTP to access
a Cisco device
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Basic Router CLI Show commands
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Basic Router CLI Show commands
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Basic Router Configuration Using CLI
Configuration Management:enable
configure terminal
copy running-config startup-config
erase startup-configreload
Global Settings:hostname
banner motdenable password
enable secret
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Basic Router Configuration Using CLI
Line Settings: line con
line aux
line vty
login and password Interface Settings:
interface type/number
description
ip addressno shutdown
clock rate
encapsulation
Routing Settings:
qrouter
qnetwork
qip route
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Switch Hardware
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Switch Hardware
Port density on a switch is an important factor.
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Basic Switch CLI Commands
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Basic Switch CLI Commands
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Basic Switch CLI Commands
Configuration Management:enable
configure terminal
copy running-config
startup-configerase startup-config
delete vlan.dat
Reload
Global Settings:hostname
banner motd
enable password
enable secret
Line Settings:
Line con
line vty
login and password
Interface Settings:
ip addressInterface
type/number (vlan1)
ip default gateway
speed / duplex
switchport port-security
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