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Network Components

Network Components. Assignment #3 By Anousone Bouasanouvong. Hub. Device for connecting multiple Ethernet devices together Makes them act as a single network segment Repeats the signal Works at the physical layer (layer 1) of the OSI model Has multiple input/output(I/O) ports

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Network Components

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  1. Network Components Assignment #3 By Anousone Bouasanouvong

  2. Hub • Device for connecting multiple Ethernet devices together • Makes them act as a single network segment • Repeats the signal • Works at the physical layer (layer 1) of the OSI model • Has multiple input/output(I/O) ports • Does not examine or manage any of the traffic that comes through it • Any packet entering any port is rebroadcast on all other ports • Prices range from $5 to $1500

  3. Hub.... • A signal is introduced at the input at any port • It appears at the output of every port except the where the signal originated from • Hubs cannot filter data so data packets are sent to all connected devices/computers • Hubs do not have intelligence to find best path for data packets. This leads to inefficiencies and wastage • Pretty much repeat signal on one end to another • Hubs are used on small networks where data transmission is not very high • Due to larger collision domains, packet collisions are more frequent in networks connected using hub than in networks using more sophisticated devices

  4. Bridge • Network device that connects multiple network segments • Works at the data layer (layer 2) of the OSI model • Looks at the destination of packet before transmitting • Won’t transmit if destination address not on other side of bridge • One incoming and outgoing port • Prices range from $20 to $3500

  5. Switch • Has multiple ports • Links network segments and devices • Filters and forwards packets between LAN segments • Switches operate at the data link layer (layer 2) and sometimes the network layer (layer 3) of the OSI Reference Model • Larger networks use switches instead of hubs • Prices range from $10 to upwards of $115,000

  6. Switch • When a packet comes through a switch it is read to determine which computer to send the data to. • This leads to increased efficiency in that packets are not going to computers that do not require them.

  7. Router • A device acting as a central relay point on a network • Forwards data packets along networks • Uses IP address to forward packets • Connected to a least two networks • Comes in wired or wireless versions • Common home use is to share broadband connection • Prices range from $15 to $500

  8. Router • Routers use headers and forwarding tables to determine the best path for forwarding the packets, and they use protocols to communicate with each other and configure the best route between any two hosts. Routing table:

  9. Gateway • Wherever it is placed, called a gateway because it provides a “gateway” from the local area to a wide area (and vice versa at the other end of the path) • Node on a network that serves as an entrance to another network • In enterprises, the gateway is the computer that routes the traffic from a workstation to the outside network that is serving the Web pages • In homes, the gateway is the ISP that connects the user to the internet • Prices range from $25 to $35,000

  10. Firewall • A security feature on a network that filters unwanted traffic from entering a network or a computer • Designed to prevent unauthorized access to or from a private network • Firewalls can be implemented in both hardware and software, or a combination of both • Frequently used to prevent unauthorized Internet users from accessing private networks connected to the Internet • All messages entering or leaving the network pass through the firewall • Examines each message and blocks those that do not meet the specified security criteria. • Prices range from $35 to $280,000

  11. Wireless Access Point • A device used to connect wireless nodes and relay traffic among nodes • Short for Access Point, a hardware device or a computer's software that acts as a communication hub for users of a wireless device to connect to a wired LAN • APs are important for providing heightened wireless security and for extending the physical range of service a wireless user has access to. • Some are combined with routers • Prices range from $5 to $10,000

  12. Network Diagram

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