performing some tests, a technician has determined that the copper media supporting the LAN is experiencing abnormal attenuation. What are two possible causes of the problem? (Choose two.)
?defective connectors? excessively long cable lengths ? use of higher grade cabling
? low frequency signals used in the media
? network cable runs isolated from other cables
6. What factors need to be considered to limit the amount of signal attenuation in Ethernet cable runs? (Choose two.) ? type of users ? number of users
?length of cable? type of electrical equipment ? installation of connectors on the cable
7. What conditions are described when transmission signals from one wire pair affects another wire pair? (Choose two.) ? noise
? resistance mismatch ? jitter ? crosstalk ? attenuation
8. What is a cause of crosstalk in UTP cable? ? cable pairs that are shorted
? cable pairs crossed during termination
? cabling runs installed in separate conduit
? cable pairs that are untwisted because of poor termination of the cable 9. Which of the following are detected by the wire map test? (Choose three.) ? near-end crosstalk (NEXT) ? opens
? propagation delay ? return loss
? reversed-pair faults ? short circuits
10. A company needs to extend the LAN to six separate buildings. To limit the amount of signal attenuation on the LAN media, what type of media would be the best to use between the buildings? ? air (wireless) ? coaxial cable ? fiber
? shielded twisted pair
? unshielded twisted pair
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CCNA1 - Module 5 Exam Answers (2008-4-8-PM-4:30)
2008-04-09 16:36:35
标签：CCNA 练习题 [推送到技术圈]
1.
Refer to the exhibit. What is the appropriate cable to use at each of the numbered network connections?
? 1-crossover; 2-straight-through; 3-crossover; 4-straight-through ? 1-straight-through; 2-crossover; 3-straight-through; 4-straight-through
? 1-straight-through; 2-crossover; 3-crossover; 4-straight-through ?1-rollover; 2-crossover; 3-straight-through; 4-straight-through?
1-rollover; 2-straight-through; 3-straight-through; 4-straight-through
2. Which two devices are considered OSI Layer 1 devices? (Choose two.) ? hubs ? routers ? bridges ? switches ? repeaters
3. What device is used to connect hosts to an Ethernet LAN and requires a straight-through UTP cable between the hosts and this device? ? NIC
? router ? switch ? server
4. What is the most common type of cabling used in LANs? ? STP ? UTP ? coax ? fiber
5. In which situations would a crossover cable be used to connect devices in a network? (Choose two.) ? switch to PC ? switch to hub ? switch to router ? switch to server ? switch to switch 6.
Refer to the exhibit. How many collision domains exist in the network? ? 1? 2? 4 ? 7 ? 8
7. What type of cable would be used to make the connection between the console port of a router and a workstation? ? crossover ? rollover
? straight-through ? patch 8.
Which function is a unique responsibility of the DCE devices shown in the exhibit?
? transmission of data ? reception of data
? clocking for the synchronous link
? noise cancellation in transmitted data
9. Which address does a bridge use to make filtering and switching decisions? ? source MAC ? source IP
? destination MAC ? destination IP
? network IP address
10. What is characteristic of how a hub operates?
? A hub selectively drops packets that represent potential security risks.? A hub forwards data out all interfaces except the inbound
interface.? A hub dynamically learns the interfaces to which all devices are attached.
? At start up, a hub queries the devices on all interfaces in order to learn the MAC addresses of the attached devices.
? A hub transmits a frame to a specific interface based on the destination MAC address.
11. Users with systems that are attached to a hub are complaining about poor response time. What device could replace the hub and provide immediate response time improvement? ? router ? switch ? bridge ? repeater
12. Which of the following are benefits of peer-to-peer networks? (Choose three.)
? centralized security ? easy to create ? very scalable
? no centralized equipment required
? centralized administrator not required ? centralized control of assets
13. Which statement is accurate about a WAN link?
? The link transmits data serially.
? The link uses a maximum distance of 100 meters.
? The link uses the same transmission rate as all other WAN links use. ? The link uses the same standardized connector style that is used for all WAN technologies. 14.
Which items in the exhibit are DTE devices? ? A and B ? B and C ? C and D ? A and D
? A, B, C, and D
15. At which layer of the OSI model does the MAC address of a NIC reside? ? physical ? application ? network
? transport? data link? session 16.
Refer to the exhibit. A technician measured the lengths of the CAT 5e structured cable runs in the exhibit. How should the technician evaluate the cabling shown in the diagram to the network administrator? ? All cabling to work areas are within specifications.
? Station A and B may experience intermittent problems because the length exceeds the recommended standard.? Station B may experience intermittent problems because the length exceeds the recommended standard.? Station C may experience intermittent network connectivity because the length is less than the recommended standard.
? Station A and B will have intermittent problems because the length exceeds the recommended standard.