Switching: means receiving data on a certain port and forwarding it to appropriate port transparently, just care about the next hop, so it is a layer 2 action. Examples of Layer 2 devices: NIC, Bridge and Switch. Hierarchical network design with access, distribution and core layers. The benefits of the hierarchical network design. Understanding hierarchical network design principles such as network diameter, bandwidth aggregation and redundancy. The definition converged network. Understanding different switch features: 1. Form Factors (Fixed, Modular and Stackable) 2. Performance (Port Density) 3. Performance (Forwarding Rates & Link Aggregation) 4. Power over Ethernet 5. L3 Functions Access Layer Switch Features. Distribution Layer Switch Features. Core Layer Switch Features Features of Cisco Catalyst Switches

1. Suez Canal University – Faculty of Computers & Informatics - Cisco Local Academy
LAN Switching and Wireless
‫بسيطة‬ ‫الحقيقة‬ ‫إن‬

2. Suez Canal University – Faculty of Computers & Informatics - Cisco Local Academy
Notes
• If you found any mistake’s’ on my PowerPoint slides or if you
have any other questions or comments, please feel free to
email me at abdu.elsaid@yahoo.com or
abdu.elsaid@gmail.com .
Thanks!
Abdelkhalik Elsaid Mosa
FCI – SCU - Egypt
Cisco Networking Academy

3. Suez Canal University – Faculty of Computers & Informatics - Cisco Local Academy
Switching & L2 Devices
• Switching: means receiving data on a certain port and
forwarding it to appropriate port transparently, just care
about the next hop, so it is a layer 2 action.
• Transparent Switching means
Hosts don’t aware of the presence of the switch in LAN.
The switch doesn’t change the frame.
• Layer 2 devices are
1.NIC
2.Bridge
3.Switch

4. Suez Canal University – Faculty of Computers & Informatics - Cisco Local Academy
The Hierarchical Network Model
• Hierarchical network design involves dividing the network
into discrete layers. These layers are easier to manage and
expand, and problems are solved more quickly.

5. Suez Canal University – Faculty of Computers & Informatics - Cisco Local Academy
The Hierarchical Network Model
• Access Layer:
 Connects end devices to the network and controls which devices are
allowed to communicate on the network.
 Includes routers, switches, bridges, hubs, and wireless AP.
• Distribution Layer:
 Aggregates the data received from the access layer switches before it is
transmitted to the core layer.
 Controls the flow of traffic using policies and delineates broadcast
domains by performing routing between VLANs.
 Its Switches are highly available and redundant to ensure reliability.
• Core Layer:
 Is the high-speed backbone of the internetwork.
 Should be highly available and redundant.
 Collapsed Core, distribution and core layers are combined into 1 layer.

6. Suez Canal University – Faculty of Computers & Informatics - Cisco Local Academy
Benefits of a Hierarchical Network

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Hierarchical Network Design Principles: Network Diameter
• Network diameter is the number of devices that a packet has to cross before it reaches
its destination.
 The smaller, the better.

8. Suez Canal University – Faculty of Computers & Informatics - Cisco Local Academy
Hierarchical Network Design Principles: Bandwidth Aggregation
• Bandwidth Aggregation is implemented by combining several parallel links between
two switches into a logical link.
EtherChannel

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Hierarchical Network Design Principles: Redundancy
• Modern networks use redundant links between hierarchical network layers in order to
ensure network availability.

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What is a converged network
• Is a network that allows for voice, video and data to use the
same IP network.”Multiple services on one network”

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Switch Features: Form Factors (Fixed, Modular and Stackable)
Cisco StackWise technology
Up to 9 switches

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Switch Features: Performance (Port Density)

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Switch Features: Performance (Forwarding Rates & Link Aggregation)

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Switch Features: PoE
• Power over Ethernet allows the switch to deliver power to a device over the existing
Ethernet cabling.

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Switch Features: L3 Functions

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Access Layer Switch Features

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Distribution Layer Switch Features

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Core Layer Switch Features

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Layer Features of the hierarchical Model
A. E. Mosa

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Features of Cisco Catalyst Switches

21. Suez Canal University – Faculty of Computers & Informatics - Local Cisco Academy