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CCNA 3 v3.0 Module 5 Switches. Objectives. LAN design LAN switches. LAN Design Goals. Functionality Scalability Adaptability Manageability. LAN Design Considerations. To maximize available LAN bandwidth and performance, the design considerations are:

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Presentation Transcript
objectives
Objectives
  • LAN design
  • LAN switches
lan design goals
LAN Design Goals
  • Functionality
  • Scalability
  • Adaptability
  • Manageability
lan design considerations
LAN Design Considerations

To maximize available LAN bandwidth and performance, the design considerations are:

  • The function and placement of servers
  • Collision-detection issues
  • Segmentation issues
  • Broadcast domain issues
lan design methodology
LAN Design Methodology
  • Gather requirements and expectations
  • Analyze requirements and data
  • Design the Layer 1, 2, and 3 LAN structure, or topology 
  • Document the logical and physical network implementation
layer 2 design developing a lan topology
Layer 2 Design: Developing a LAN Topology
  • Switch frames based on MAC address information
  • Provide error detection
  • Reduce congestion in network
microsegmentation of the network
Microsegmentation of the Network

Microsegmentation of the network reduces the size of collision domains and reduces collisions.

asymmetric switching
Asymmetric Switching

Asymmetric switching provides switched connections between ports of unlike bandwidth, such as a combination of 10-Mbps and 100-Mbps ports

use routers to impose logical structure
Use Routers to Impose Logical Structure

Routers provide scalability because they serve as firewalls for broadcasts. They can also provide scalability by dividing networks into subnetworks, or subnets, based on Layer 3 addresses.

access layer
Access Layer

The access layer provides users in workgroups access to the network. It is the entry point for user workstations and servers to the network.

access layer1
Access Layer

Functions of the Access Layer:

  • Shared Bandwidth, if hub is used.
  • Switched Bandwidth, if switch is used.
  • MAC Layer filtering.
  • Microsegmentation: creates small collision domain.
access layer switches
Access Layer Switches
  • Catalyst 1900 series
  • Catalyst 2820 series
  • Catalyst 2950 series
  • Catalyst 4000 series
  • Catalyst 5000 series
distribution layer
Distribution Layer

The distribution layer of the network is between the access and core layers. It helps to define and separate the core. The purpose of this layer is to provide a boundary definition in which packet manipulation can take place.

distribution layer1
Distribution Layer
  • In a switched network, the distribution layer includes several functions such as the following:
    • Aggregation of the wiring-closet connections
    • Broadcast/multicast domain definition
    • VLAN routing
    • Any media transitions that need to occur
    • Security
distribution layer switches

Cisco Catalyst 2926G

Cisco Catalyst 6000 Family

Distribution Layer Switches

<not pictured>

Cisco Catalyst 5000 Family

core layer
Core Layer

The core layer is a high-speed switching backbone. The core layer should be designed to switch packets as fast as possible.

core layer switches

IGX 8400 series

Catalyst 8500 series

Lightstream 1010

Core Layer Switches

<not pictured>

Catalyst 6500 series