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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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Collapsed core

Small networks: merged _____________________

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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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Topology Diagram

Ports/switches?Bandwidth?Bottlenecks?

Layers?Routes?Redundancy?

Document it now

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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.

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Catalyst Switch product lines

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Catalyst Switch product lines

Concentrate on general

features