WGU D322 - Introduction to IT Section 4: Computer Networks

WGU D322 - Introduction to IT Section 4: Computer

Networks Leave the first rating Students also studied Terms in this set (41) Western Governors UniversityD 322 Save Intro to IT - WGU Section 2 Starter S...55 terms anna_striedel1 Preview intro to IT section 4 25 terms timmyg77Preview Introduction to IT - D322/ Pre-asses...70 terms quique218Preview WGU - 66 terms Atra NetworkingSharing information and resources through linked computer systems.Network Types - PAN (Personal Area Network) A computer in the middle and other devices (including a cell phone, tablet, wireless mouse, wireless headset, and printer) connected to it.Network Types - LAN (Local Area Network)Consist of a collection of computers in a single building or building complex. (e.g., A router in the middle with various other devices such as workstations, a cell phone, a tablet, and printer connected.) Network Types - WAN (Wide Area Network)Link systems over a greater distance including machines on the opposite sides of the world.TCP/IP ProtocolCommunication over the internet is governed by an open collection of standards by this protocol. Anyone is free to use these protocols without paying fees or signing license agreements.Four Common Network TopologyBus, Star, Ring, and Mesh (Bus and Star network topologies are the most common).Network Topology - BUSMachines are connected to a common communication line. It became popular in the 1990s when it was implemented under a set of standards/protocols known as the Ethernet.

Network Topology - StarHave a single machine serving as a central point to which all others are connected. (Various computers connected in the middle by a router). Roots as far back as the 1970s when it evolved from the idea of a large central computer system servicing many users at once.In wireless networks where communication is carried out via radio broadcast to a central machine called the access point (AP).Network Topology - RingConnect directly to each other as a peer.Network Topology - MeshIt connects every device in a network to every other device; it enabled redundancy while also introducing significantly more network traffic. Alternatively, a network could use a hybrid of these topologies.

• A network in which devices -- or nodes -- are linked together, branching off

other devices or nodes. These networks are set up to efficiently route data between devices and clients. They help organizations provide a consistent connection throughout a physical space.Which network topology best handles downed links without losing connectivity between devices?Mesh Client-Server ModelA distributed application framework diving tasks between servers and clients, which either reside in the same system or communicate through a computer network or the internet.Peer-to-Peer (P2P) ModelA decentralized communications model. A non-hierarchical of exchange, transfer, or transmission.Distributed System Modela collection of independent components located on different machines that share messages with each other in order to achieve common goals.

• Cluster computing
• Grid computing
• Cloud computing

Cluster ComputingUses many independent computers to provide computation or services comparable to those larger machines. The cost of several individual machines can be less than a higher priced supercomputer, with comparable performance.Grid Computing Cloud ComputingProvide large pools of shared computers that can be allocated to clients as needed. Provides reasonable guarantees for reliability and scalability while raising concerns about security and privacy.Network Transmission Mediarefers to the various types of media used to carry the signal between computers.Wired Network Transmission MediaTwisted pair cables, coaxial cable, and optical fiber cables.Wireless Network Transmission MediaRadio waves, microwaves, and infrared waves.Twisted Pair cableThe most widely used. Two common types are

Twisted Pair TypesUnshielded twisted pair (UTP) and shielded twisted pair (STP) Coaxial Cableinsulated copper wire; used to carry high-speed data traffic and television signals.Fiber-optic cableUses the concept of reflection of light through a core made up of glass or plastic.Able to transmit large amounts of data.Wireless TransmissionElectromagnetic waves of different frequencies, such as infrared or radio waves, can be used to transmit data within a network with the use of Wi-Fi, Bluetooth, or even near field communication. These radio waves are what is used to carry radio signals far distances to other networked devices.LaptopA portable personal computer with a folding design. It includes an integrated flat screen, a keyboard with a mouse, and usually, a battery. It can also contain a CDROM, DVD-ROM, as well as various other devices such as SD card readers, Wi- Fi, Bluetooth, etcetera. Laptops typically connect to networks via Wi-Fi or Ethernet.RouterSpecial-purpose computers that forward messages to and from the machines on their network. They use their forwarding table to match up the private IP address with the internet IP address and send the message to the correct machine.PrinterIt can reside on networks through the router or a switch, making them accessible to all the other network devices. Printers typically connect to networks via Ethernet but can also use Wi-Fi.FirewallA firewall monitors network traffic and blocks traffic that triggers its safety rules, providing a barrier between a trusted private network and an untrusted network like the internet.ModemIt bridges between the customer network and the ISP, converting the incoming analog data into digital, and the outgoing digital data into analog. It provides the access point to the internet.SwitchExtends the network by using packet switching to forward data to the intended hard-wired devices.Desktop ComputerTypically, a tower chassis enclosure which contains the internal components of the computer system, an external display that provides output, and a keyboard and mouse to provide input. Typically connect to a network via Ethernet but can also utilize Wi-Fi.Servera computer that provides services, such as website hosting and routing, for other devices.SmartphoneIt is a cellular phone with an operating system and the ability to run third-party applications. Typically, smartphones connect to networks using cellular wireless frequencies or Wi-Fi on local networks.Tablet Computera portable computer typically with touchscreen display and a rechargeable battery in a thin and flat design. Typically, it connects to a network via Wi-Fi.

Internetgenerally, refers to the worldwide Internet and is most often what non-technical people are referring to when they speak of the Internet. However, an internet is simply a network of networks. Often, when IT professionals refer to the internet, they are referring to a network of networks.Which type of transmission media can broadcast in baseband mode?Coax cable

True or False: Coax cable can broadcast in both

baseband and broadband modes.True ISPsInternet Service Providers ISP HierarchyTier 1: At the top of the ISP hierarchy, is the least common type of ISP and serves as the backbone of the internet. It consists of high-speed, high-capacity, international WANs that are typically operated by large communication companies.

Tier 2: More common and regional in scope.

Tier 3: Access IPs are typically independent internets, or sometimes called

intranets, operated by s single organization that supplies internet access to homes and businesses.Information SystemA collection of information used to support management of organization.