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IT2101 : Communication Technology. 4. Common Network Devices / Hardware Program: BSCS I (January Semester – 2014) Lecturer: Rebecca Asiimwe Email: [email protected]. Network Devices. - PowerPoint PPT Presentation
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IT2101: Communication Technology
4. Common Network Devices / Hardware
Program: BSCS I (January Semester – 2014)Lecturer: Rebecca Asiimwe
Email: [email protected]
Network Devices
• Network devices are tangible parts of a computer Network that facilitate communication between nodes on the network.
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Common Network Hardware
• These are equipment that facilitate the use of computer networks.
They include:-A Router - A Gateway
-A Switch - A Hub
-Access point - A bridge
-Network Interface Card - Modem
-Networking cables - A Firewall
e.t.c…
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The NIC
• A network card, network adapter or Network Interface Card (NIC) is a piece of computer hardware designed to allow computers to communicate over a computer network.
• Provides a low-level addressing system through the use of MAC addresses. It allows users to connect to each other either by using cables or wirelessly.
• The NIC is both an OSI layer 1 (physical layer) and layer 2 (data link layer)device.
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NIC
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Hubs
• A hub contains multiple ports. When a packet arrives at one port, it is copied to all the ports of the hub.
• This means that a communication will be exposed to all other connected nodes to the Hub.
• It connects multiple devices together & makes them act like a single network segment.
• Note: The difference between a Hub and a Switch in Networking.
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Hubs
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Switches
• A small hardware device that joins multiple computers together within one Local Area Network (LAN).
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Switches
• These are capable of inspecting data packets as they are received, determining the source and destination device of that packet, and forwarding it appropriately.
• This is the main difference between them and the Hubs.
Question:
• What is a Switching Hub?
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Firewall
A firewall is a device or set of devices designed to permit or deny network transmissions based upon a set of rules and is frequently used to protect networks from unauthorized access while permitting legitimate communications to pass.
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Firewall - Front
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Firewall - Back
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A Router
• Is a device that extracts the destination of a packet it receives, selects the best path to the destination and forwards data packets to the next device along the path.
• Note: Routers connect networks together: e.g. LAN to WAN to access the internet
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A Router Cont’d
• Routers forward data packets along networks by using headers and forwarding tables to determine the best path to forward the packets.
• Routers work at the network layer (layer 3) of the OSI model (OSI is to be discussed in a later lecture)
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Routers
Switches
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A Repeater
• A repeater is an electronic device that receives a signal and retransmits it at a higher level or higher power.
• This helps in regenerating the signal since it gets weak as it travels further from its origin.
• This process (weakening of the signal as it travels further from its point of origin) is called attenuation
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Research About:
• A Bridge
• A Brouter
• A Gateway
• An Access point
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Q & A