Basic Network Concepts in Software

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6 C An extranet allows selected individuals to see your corporate intranet A, B, and D are incorrect An intranet allows only individuals within your company to access the site; allowing anyone on the Internet to access it would make it an Internet-type application
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7 C The topology is the physical layout of computers, cables, and other components on a network Many networks are a combination of the various topologies A is incorrect because a segment is a part of a LAN that is separated by routers or bridges from the rest of the LAN B is incorrect because a backbone is the main part of cabling that joins all of the segments together and handles the bulk of the network traffic D is incorrect because a protocol is a set of rules governing the communication between PCs; a protocol can be thought of as similar to a language 8 B In a star topology, all computers are connected through one central hub or switch A star topology actually comes from the days of the mainframe system The mainframe system had a centralized point at which the terminals connected A is incorrect because a bus topology uses one cable to connect multiple computers C is incorrect because the mesh network has every PC connected to every other PC and can resemble a spider s web D is incorrect because a ring topology resembles a circle or ring E is incorrect because there is no physical cabling to represent the topology; it is represented by a bubble or cell 9 C A mesh topology is not very common in computer networking, but you have to know it for the exam The mesh topology is seen more commonly with something like the national telephone network With a mesh topology, every workstation has a connection to every other component of the network A is incorrect because a bus topology uses one cable to connect multiple computers B is incorrect because a star topology is made up of a central point or hub with cables coming from the hub and extending to the PCs D is incorrect because this topology resembles a circle or ring E is incorrect because there is no physical cabling to represent the topology; it is represented by a bubble or cell 10 A A bus topology uses terminators on any loose end of the bus The terminator is designed to absorb the signal so that it does not bounce back on the wire and collide with other data B is incorrect because a star topology does not use terminators; it uses a central hub or switch that connects systems to the network C is incorrect because a mesh topology has each system connecting to each other system D is incorrect because a ring topology has no beginning and no end, so there are no loose ends to put a terminator on E is incorrect because a wireless network does not use cables at all
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11 D RJ-45 is not a network medium Three primary types of physical media can be used: coaxial cable, twisted-pair cable, and fiber-optic cable Transmission rates that can be supported on each of these physical media are measured in millions of bits per second (Mbps) RJ-45 is a connector type for twisted-pair cabling A, B, and C are incorrect because they are all common network media 12 B 10Base2 (thinnet) has a distance limitation of 185 meters 10Base5 (thicknet) has a distance limitation of 500 meters, and 10BaseT (twisted-pair) has a distance limitation of 100 meters A, C, and D are incorrect because these are not the distances covered by thinnet 13 C Fiber-optic cabling sends pulses of light through a glass core A, B, and D are incorrect because each carry an electrical signal
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14 A All twisted-pair cabling is limited to 100 meters B is incorrect because 185 meters is the maximum distance of thinnet cabling; D is incorrect because 500 meters is the maximum distance of thicknet cabling C is incorrect; there is no cable type that has a 250-meter maximum distance 15 D 500 meters is the maximum distance of thicknet cabling A is incorrect because all twisted-pair cabling is limited to 100 meters B is incorrect because 185 meters is the maximum distance of thinnet cabling C is incorrect because there is no cable type that has a 250-meter maximum distance 16 B 100BaseT uses twisted-pair that runs at 100 Mbps CAT 5 is twisted-pair cabling type that runs at 100 Mbps A is incorrect because CAT 3 runs at 10 Mbps C is incorrect because thinnet runs at 10 Mbps and is known as 10Base2 D is incorrect Although fiber optic can run at 100 Mbps, it is not used in 100BaseT 17 A and D Fiber-optic cabling uses a number of connector styles two of which are the SC and ST connectors B and C are incorrect RJ-45 is used by twisted-pair cabling, and BNC is used by thinnet 18 C Single-mode fiber-optic cabling has a maximum distance of approximately 2 km A, B, and D are incorrect distances for single-mode fiber, although 300 meters is the maximum distance of multimode fiber 19 D Fiber-optic cabling is immune to outside interference and crosstalk A, B, and C are incorrect Thinnet, thicknet, and twisted-pair cabling are susceptible to outside interference
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