1 LAN design- Chapter 1 CCNA Exploration Semester 3 Modified by Profs. Ward and Cappellino.
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Transcript of 1 LAN design- Chapter 1 CCNA Exploration Semester 3 Modified by Profs. Ward and Cappellino.
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Topics
Networks and business needs The 3-level hierarchical network design
model Including voice and video over IP in the
design Devices at each layer of the hierarchy Cisco switches for each layer
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LAN Switching and Wireless
LAN Design- Ch 1
Basic Switch Concepts
VLANs
VTP
STP
Inter-VLAN routing
Wireless
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Hierarchical design model
Hierarchical network design _______________________________ ___________________________________ Makes network _________________________________
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Hierarchical design model
High speed backbone.
Must be capable of ___________________________________ Should be ____________________ to ensure reliability
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Hierarchical design model
__________________________________ switches before it is _______________________ for routing to its final destination
Should be _________________ to ensure reliability
Separate subnets, VLANs, routing, flow control, security.
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Hierarchical design model
Connects end devices to the network. Controls which devices are allowed to communicate.
__________________________________ occur here
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Logical and physical layout
Logical – _____ _____________
Physical – _____ _____________ in the building Logical
connections not obvious from looking.
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Benefits of Hierarchical Network Scalability – __________________ as network grows Redundancy – at __________________________ Performance – route packets at _________________
between all devices Security – ___________________________ at the
access layer ______________________________________________
Manageability – ____________________________ Consistency between the switches at each layer simplifies
management Maintainability – modularity allows for network to
________________________________________
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Design principles
Network diameter – _______________________ ______________________________? The ______________________ to decrease latency More to come in later chapter…
Bandwidth aggregation – ___________________ ________ between two switches _______________ where high bandwidth is needed.
Redundant links/devices – in core and distribution layers. Too _____________ for access.
Start design at the access layer. Ask: How many devices, how much bandwidth needed?
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Converged network
_____________________________________ Not converged as in “all routers have consistent
information”. Same word used. Needs quality of service (_________) to give _____
__________________________________ Was very expensive, needed expertise, needed to
replace legacy equipment. Now ________________________ for small to
medium-sized businesses
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Advantages of converged network
______________________/ keep up to date Decreased cost of management
_____________________ and networking devices Less expensive than having three sets of network cabling
_______________________ to run it ______________________________ Can have voice and video on employee’s PC using
headset, webcam and software – ______________ ________________________
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Choosing switches
Carry out _______________________ using software to _________________________________. Allow for growth. Traffic flow analysis- the process of ___________________
_______________ on a network and analyzing the data for the purpose of performance tuning, capacity planning, etc
Carry out ____________________. Group by job function. How many ports? How much bandwidth? Allow for growth. User community analysis- the process of _____________
_______________________________________________ Carry out __________________________________.
Traffic to, from, between. consider both client-server traffic and server-server traffic.
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Topology Diagram
Graphical _________________ of a network infrastructure.
Ports/switches?Bandwidth?Bottlenecks?
Layers?Routes?Redundancy?
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Choosing switches (contd)
Switch form factors: ___________________
________________________________________ beyond those that originally came with the switch.
_____________________ Different sized chassis that
_________________________________________________ ports on cards
_________________ ___________________________ Linked by special backplane cables
to special ports
1 rack unit (1U)
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Choosing switches (contd)
___________________ – number of ______________ on a single switch Allow for links between switches
_________________ – ___________________ of a switch How many Gbps can it process? Can all ports work
simultaneously at maximum speed?
__________________ determine if there are _____________
on a switch to aggregate if needed Allows up to __________________________________ one,
with combined bandwidth ____________________________
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Choosing switches (contd)
Power over Ethernet (_____) for IP phones, network access points. Allows the ___________________________
__________________________________ Do you need it? It adds to the cost.
___________________ (aka _____________ switch) needed? Typical switch works at ____________________ uses
________________ addresses. _____________________ also works at ______________
________________________________.
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_______ Layer Switch Features __________ – switch decides which devices are
allowed to connect to it. Supported by all Cisco switches
___________ – devices located on different subnets. Configurable on Access Layer switches
___________ – Fast Ethernet (100Mbps) or Gigabit. Power over Ethernet (_____) – expensive __________________ – for uplink to distribution
layer if needed Quality of service (______) maintains the
prioritization of traffic in converged networks
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_________ Layer Switch Features _________________________________
One VLAN can communicate with another __________________________ (processing) _______________ Gbps/10Gbps Ethernet ports ______________________ for adequate availability ____________________ – access control lists control traffic flow ___________________ ensure adequate bandwidth to
accommodate the traffic generated on the access layer provides fault tolerance in case a link is lost.
______________________ maintains the prioritization of traffic from Access layer switches which have implemented QoS
_____________________ Multiple hot swappable power supplies recommended
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_______ Layer Switch Features _____________________________________ Very ____________________________ __________________ Ethernet ports ________________________________ _______________________ support for aggregated
10GbE connections ______________________________ ________________ power supplies and cooling fans NOTE:
Avoid applying security and other distractions here. Go for speed.