CISSP Practice

43. d. Microwave transmission is a point-to-point transmission using radio frequency spectrum signals and is commonly used as a substitution for copper or fiber cable. Because of this, it is not suitable for handling intra-building communications and is more appropriate for long-distance transmission. Twisted pair, made of copper wire, is best for low-cost, short-distance local networks linking microcomputers. Coaxial cable is rarely used medium for data transmission in local-area networking. Optical fiber uses light signals to carry a stream of data at extremely high modulation rates and is sturdy and secure.

44. From a corporation viewpoint, which of the following design objectives is most important for a local-area network?

a. Productivity

b. Availability

c. Throughput

d. Responsiveness

44. b. Availability is the ratio of the total time a functional unit is capable of being used during a given interval to the length of the interval. It is the time during which a functional unit can be used. What good are productivity, throughput, and response time if the system is shut down and not available? Therefore, system availability is the most important objective for a local-area network (LAN) or any other network.

45. Which of the following wiring schemes makes future network changes easier to implement?

a. Post wiring

b. Wiring on demand

c. Buildings with high ceilings

d. Cable conduits

45. d. Because the cost of wiring an existing building goes up with the height of the ceiling and rises even higher after the tenants have moved in, making the right decisions as early as possible can significantly reduce future costs. Dangling cables can be a safety hazard. Therefore, proactive thinking such as prewiring and cable conduits during building construction should be planned carefully to make future changes easier with less cost. Post-wiring and wiring on demand are reactive in nature, relatively expensive, and disruptive to work.

46. Which of the following is a disadvantage of satellite communications versus a conventional communications method?

a. User-owned stations

b. Cost

c. Frequency bands

d. Broadcast ability

46. c. Frequency bands are of two types: low and high frequency. All the lower frequency bands have become increasingly crowded, and developing higher frequencies is difficult and expensive. Also, transmission problems typically worsen at higher frequencies. In satellite systems, power must be increased at both the original transmission site (uplink) on earth and on the satellite. Increased satellite power generally increases costs.

The other three choices are advantages. Users purchase their own sending and receiving equipment. Satellites have a low-cost, point-to-multipoint broadcast capability that is most expensive to duplicate with conventional techniques.

47. Host-based firewalls can have a serious negative effect on system usability and user satisfaction with which of the following?

a. Deny-by-default rulesets for incoming traffic

b. Deny-by-default rulesets for outgoing traffic

c. Deny-by-default rulesets for servers

d. Deny-by-default rulesets for desktops

47. b. To prevent malware incidents, organizations should configure host-based firewalls with deny-by-default rulesets for incoming traffic. Organizations should also use deny-by-default rulesets for outgoing traffic, if feasible; however, such rulesets can have a serious negative effect on system usability and user satisfaction. Servers, desktops, and laptops use similar rulesets as host-based firewalls do.

48. Remote control programs have a number of disadvantages when they are used for remote local-area network (LAN) access. Which of the following disadvantages is most difficult to manage?

a. Telephone connect time not minimized

b. Manually connect and disconnect operations

c. Compatibility with host applications

d. Network management time