1-43. 1-44. 1-45. 1-46. Which  layer  represents  the services  that  directly support  users? 1. Application 2. Network 3. Physical 4. Session Which of the following cable types  is  the  least expensive? 1. Coaxial 2. Fiber optic 3. Solid core 4. Twisted-pair For network purposes, 22- and 24-gauge wire are the most common types of which of the following types of cables? 1. Coaxial 2. Fiber optic 3. Solid core 4. Twisted-pair Which of the following types of cable can handle a data flow of up to approximately one Mbps? 1. Coaxial 2. Fiber optic 3. Solid core 4. Twisted-pair 1-47. Coaxial cable is used extensively  in  LANs  whenever the distance involved is relatively  short,  generally less than how many miles (a) for baseband and (b) for broadband? 1. (a) 1 (b) 5 2. (a) 2 (b) 5 3. (a) 2 (b) 10 4. (a) 5 (b) 10 1-48. Fiber optic cable has a transmission rate that ranges  up  to  approximately what speed? 1. 1 Gbps 2. 3 Gbps 3. 5 Gbps 4. 7 Gbps 1-49. Why  is  fiber  optic  cable immune to electrical interference of any kind? 1. Has only one strand per cable 2. Has  thick  shielding 3. Carries  no  electrical current 4. Uses  double  insulation on each wire 1-50. What software package makes it possible to implement and control a network and enables users to use the resources and services on the network? 1. Network   application software 2. Network  operating software 3. Network  system  software 4. Telecommunications access  software 6