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__**NET WORKS WORKSHEET 1**__ My job is to do questions 7-9.

__QUESTION 7__ __Computers connected to a network are required to have a network interface card (NIC). What is the purpose of a NIC?__ The purpose of a Network Interface Card (NIC) is to provide your computer with a physical connection to a network. Almost all new computers come with a pre-installed NIC.

__QUESTION 8__ __The following transmission media can be used to enable computers to communicate with each other.__ __ ·  Twisted pair cable (shielded and unshielded) __ __ ·  Coaxial cable __ __ ·  Fibre optic __ __Describe each type of transmission media and provide an example of the situation in which it would best be used.__

__Twisted pair cable (shielded and unshielded)__ A type of cable that consists of two independently insulated wires twisted around one another. The use of two wires twisted together helps to reduce crosstalk and electromagnetic induction. __Coaxial cable__ A type of wire that consists of a center wire surrounded by insulation and then a grounded shield of braided wire. The shield minimizes electrical and radio frequency interference. __ Fibre optic __ Fibre optics use glass (or plastic) threads (fibers) to transmit data. A fiber optic cable consists of a bundle of glass threads, each of which is capable of transmitting messages modulated onto light waves.

__QUESTION 9__ __In the area of data transmission, what do the following terms mean?__  __· __ __Bandwidth__ The amount of data that can be transmitted in a fixed amount of time.  __· __ __Baseband__ A type of data transmission in which digital or analog data is sent over a single unmultiplexed channel  __· __ __Broadband__ A type of data transmission in which a single medium (wire) can carry several channels at once.  __· __ __Simplex__ Refers to transmission in only one direction.  __· __ __Half-duplex__ Refers to the transmission of data in just one direction at a time. For example, a walkie-talkie is a half-duplex device because only one personcan talk at a time.  __· __ __Duplex__ Refers to the transmission of data in two directions simultaneously. For example, a telephone is a full-duplex device because both people can talk at once.

__QUESTION 10__ __What is the function of the following pieces of network hardware commonly used in LAN’s?__  __· __ __Hub__ A common connection point for devices in a network. Hubs are commonly used to connect segments of a LAN.  __· __ __Repeater__ A network device used to regenerate or replicate a signal.  __· __ __Router__ A device that forwards data packets along networks.  __· __ __Bridge__ A device that connects two LAN's  __· __ __Gateway__ A node on a network that serves as an entrance to another network. <span style="FONT-SIZE: 10pt; FONT-FAMILY: Symbol; mso-fareast-font-family: Symbol; mso-bidi-font-family: Symbol"> __· __ __Switch__ a device that filters and forwards packets between LAN segments

<span style="FONT-SIZE: 14pt; FONT-FAMILY: 'Arial Narrow'; mso-fareast-font-family: 'Arial Narrow'; mso-bidi-font-family: 'Arial Narrow'"> A)  You would need a router and cords to connect all of the computers. <span style="FONT-SIZE: 14pt; FONT-FAMILY: 'Arial Narrow'; mso-fareast-font-family: 'Arial Narrow'; mso-bidi-font-family: 'Arial Narrow'"> B)   I would recommend a ring topology because there isn’t a “central” computer and the ring connects them all to each other. <span style="FONT-SIZE: 14pt; FONT-FAMILY: 'Arial Narrow'; mso-fareast-font-family: 'Arial Narrow'; mso-bidi-font-family: 'Arial Narrow'"> C)
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**Architecture and hardware 2**