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Flashcards

Networks

Olivia Hird Inglês 25 flashcards

Flashcards do conjunto (25)

  1. 1What is a computer network?too or more computers connected to share infotmation
  2. 2Describe a LANis a local area network is a connected set of computers
  3. 3Describe a WANcover large geographical area use cables telephone lines and radio waves to connect
  4. 4What are the advantages of a computer network?Advantages
    Network users can communicate by email and instant messenger. Security is good - users cannot see other users' files unlike on stand-alone machines.
  5. 5What are the disadvantages of a computer network?Purchasing the network cabling and file servers can be expensive.
    Managing a large network is complicated, requires training and a network manager usually needs to be employed.
    If the file server breaks down the files on the file server become inaccessible. Email might still work if it is on a separate server.
    Viruses can spread to other computers throughout a computer network.
    There is a danger of hacking, particularly with wide area networks.
  6. 6What devices are needed to produce a LAN?Network Adapter. A computer needs network adapter to connect to a network.
    Network Medium.Wired networks need cable.
    Cable Connectors.
    Power Supply. ...
    Hub/Switch/Router. ...
    Network Software
  7. 7What is the purpose of a NIC?The NIC contains the electronic circuitry required to communicate using a wired connection Ethernet or a wireless connection WiFi. A network interface card is also known as a network interface controller, network adapter, or Local Area Network (LAN) adapter.
  8. 8What is the purpose of a Router?The main purpose of a router is to connect multiple networks and forward packets destined either for its own networks or other networks. A router is considered a layer-3 device because its primary forwarding decision is based on the information in the layer-3 IP packet, specifically the destination IP address.
  9. 9What is the purpose of a Hub?A hub, also called a network hub, is a common connection point for devices in a network. Hubs are devices commonly used to connect segments of a LAN. The hub contains multiple ports. When a packet arrives at one port, it is copied to the other ports so that all segments of the LAN can see all packets.
  10. 10What is the purpose of a Switch?The basic function that any switch is supposed to perform is to receive information from any source connected to it and dispatch that information to the appropriate destination only. This thing differentiates switches from hubs. Hub gets the information and forwards that to every other device in the network.
  11. 11What is the purpose of a WAP?A wireless access point (WAP) is a hardware device or configured node on a local area network (LAN) that allows wireless capable devices and wired networks to connect through a wireless standard, including Wi-Fi or Bluetooth.
  12. 12What is the difference between a Hub and a Switch?Function of a switch vs. a hub. A switch is used to connect various network segments. A network switch is a small hardware device that joins multiple computers together within one local area network (LAN). A Hub connects multiple Ethernet devices together, making them act as a single segment.
  13. 13What is the Internet?a global computer network providing a variety of information and communication facilities, consisting of interconnected networks using standardized communication protocols.
  14. 14What is the World Wide Web?an information system on the Internet which allows documents to be connected to other documents by hypertext links, enabling the user to search for information by moving from one document to another.
  15. 15What is the purpose of a Modem?Modem stands for MOdulator/DEModulator. A modem converts digital signals generated by the computer into analog signals which can be transmitted over a telephone or cable line and transforms incoming analog signals into their digital equivalents.
  16. 16What is the purpose of an ISP?An Internet service provider (ISP) is an organization that provides services accessing and using the Internet. Internet service providers may be organized in various forms, such as commercial, community-owned, non-profit, or otherwise privately owned
  17. 17What is an IP address?a unique string of numbers separated by full stops that identifies each computer using the Internet Protocol to communicate over a network.
  18. 18What does HTTP stand for?HTTPS stands for Hypertext Transfer Protocol Secure, and instead of acting as its own application layer protocol, it uses separate protocols called SSL (Secure Sockets Layer) and TLS (Transport Layer Security).
  19. 19What is a URL?the address of a World Wide Web page
  20. 20How is a URL constructed?A URL can be thought of as the "address" of a web page and is sometimes referred to informally as a "web address." ... A URL is made up of several parts. The first part is the protocol, which tells the web browser what sort of server it will be talking to in order to fetch the URL
  21. 21What are the three different network topologies?Mesh Topology. Mesh Topology: In a mesh network, devices are connected with many redundant interconnections between network nodes. Star Topology. Star Topology: In a star network devices are connected to a central computer, called a hub.Bus Topology. RingTopology.
    Tree Topology.
  22. 22What are the advantages / disadvantages of a Star topology?Star Topology: Advantages and Disadvantages. In Star topology, all the components of network are connected to the central device called “hub” which may be a hub, a router or a switch. ... So it can be said that every computer is indirectly connected to every other node by the help of “hub”
  23. 23What are the advantages / disadvantages of a Ring topology?Disadvantages of ring topology. All data being transferred over the network must pass through each workstation on the network, which can make it slower than a star topology. ... The hardware needed to connect each workstation to the network is more expensive than Ethernet cards and hubs/switches.
  24. 24What are the advantages / disadvantages of a Bus topology?Alternatively referred to as a line topology, a bus topology is a network setup in which each computer and network device are connected to a single cable or backbone. The following sections contain both the advantages and disadvantages of using a bus topology with your devices
  25. 25List examples of data that need to be kept secure

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FlashCards sobre Networks, criado por Olivia Hird em 23-11-2017.
Criado por
Olivia Hird
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