Computer Network Devices

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1. Gateways are distinct from routers or switches in that they communicate using more than one protocolh6k and can operate at any of the seven layers of the open systems interconnection model .


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2. A router is a networking device that forwards data packets between computer networks. Routers perform the traffic directing functions on the Internet.


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3. In the OSI model, bridging is performed in the data link layer. A network bridge is a computer networking device that creates a single aggregate network from multiple communication networks or network segments.


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4. A VPN concentrator is a type of networking device that provides secure creation of VPN connections and delivery of messages between VPN nodes.


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5. A host-based intrusion detection system is an intrusion detection system that is capable of monitoring and analyzing the internals of a computing system as well as the network packets on its network interfaces.


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6. A load balancer is a device that acts as a reverse proxy and distributes network or application traffic across a number of servers. Load balancers are used to increase capacity and reliability of applications


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7. Repeater is an electronic device that receives a signal and retransmits it at a higher level onto the other side of an obstruction, so that the signal can cover longer distances.


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8. A Protocol Converter is a device used to convert standard or proprietary protocol of one device to the protocol suitable for the other device or tools to achieve the interoperability.


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9. A network switch is a computer networking device that connects devices on a computer network by using packet switching to receive, process, and forward data to the destination device.


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10. A hub, in the context of networking, is a hardware device that relays communication data. A hub sends data packets to all devices on a network.


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11. A layer 3 switch is a switch and a router built together for fast performance. A router is a networking device that forwards data packets between computer networks.


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12. NIC stands for Network Interface Card. It is used to connect the computer to the external network. It will normally have a PCI connector to connect to one of the PC expansion slots.


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13. Straight-Through cable is also referred to as a “patch cable.” Straight-through cable is used to connect computers and other end user devices to networking devices such as hubs & switches.


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14. A hub is a hardware device that relays communication data. A hub sends data packets to all devices on a network. The hub allow system administrators to monitor data passing through and to configure each port.


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15. Modem is a device that converts digital signal to analog signal as a modulator and analog signal to digital signal as a demodulator. Asynchronous modem uses start and stop bit for synchronization instead of clock.


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16. Active hub can store, amplify, split and retransmit the received signals. It requires additional electronic circuit for performing different functions.


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17. A Network Interface Card is circuit board or a card that allows computers to communicate over a network via cables or wirelessly. Every network adaptor is assigned a unique 48-bit Media Access Control address, which is stored in ROM to identify themselves in a network.


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18. Source route bridge is used on token ring networks. Bridge derives the entire path of the frame embedded in the header of the frame and decides how to forward the frame through out the network till it reaches its destination.


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19. A gateway performs many function. Some of them are Protocol translation, network address translation and DHCP service. It is used to route the traffic from one network to another and to connect LAN to WAN or VPN.


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20. An access router is a router that sits at the periphery of a network. It is also known as edge router. It Contrast with "core router," which is a router that resides in the middle of the network.


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