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Hierarchical Network Design Creates a Stable,Reliable,Scalabe Network,…
Hierarchical Network Design Creates a Stable,Reliable,Scalabe Network
NETWORK REQUIREMENTS
fast recovery
application response time
ease management
fast troubleshootong
FUNDAMENTAL NETWORK DESIGN GOAL
Availability
Security
Scalability
-support new apps without impact
Manageability
CORE LAYER
-distribution layer device
DISTRIBUTION LAYER
-smaller LANs
ACCESS LAYER
-host & end devices
THREE LAYER MODEL
-enterprise campus
-server farm
-enterprise edge
ADVANTAGES MODULAR FRAMEWORK
eases the design task
(making each module independent)
provides scalability
(allowing enterpirses to add modules easily)
creates deterministic network between modules.
(clearly defined boundaries)
designer can add services and solution.
(not change the underlying network design)
STEP IN NETWORK DESIGN PROJECTS
characterize the existing network
design the network topology and solution
identify the network requirements
ACCESS LAYER OF A NETWORK
physical location of equipment
availability
converged networking
wiring closets
naming structures
VLAN architecture
Traffic patterns
prioritization strategies
functions of VLANs
separate and classify traffic
control broadcasts
contain VLANs within a single wiring closet
QoS at network edge
Classification
Assigned priority
Security risks at netwok edge
Authentication
Wireless security
Security measures
physical security
strong password
SSH
disabling unused ports
NETWORK CORE LAYER
GOALS
provide 100% uptime
maximize throughput
facilitate network growth
Network backbone
combining routing & switching in the same device
redundancy and load balancing
high-speed and aggregate link
quick convergence
partial mesh topologi
reduce human error
faillure prevention
full mesh topology
DISTRIBUTION LAYER OF A NETWORK
filtering and managing traffic flow
routing between VLANs
route summarization
isolating core layer
(access layer failures)
access control policies
redundant links improve network reliability and stability
ACLs filter traffic for security and traffic management
route summarization and describe how its implemented at distribution layer of network
