1. Which network topology has all the nodes returning to a central hub?
A) Star
B) Ring
C) Bus
D) Fully meshed
Correct Answer (s):A) Star
Explanation:The correct answer is a. A star topology has all the connections returning to a central point that is usually a hub. A ring topology makes a connection from computer to computer. Therefore, answer b is incorrect. A basic bus topology is a Thinnet or Thicknet coaxial network. Therefore, answer c is incorrect. A fully meshed network is usually composed of a routed network. Therefore, answer d is incorrect.
2. Which network topology has all the nodes connected to one coaxial cable?
A) Star
B) Ring
C) Bus
D) Fully meshed
Correct Answer (s):C) Bus
Explanation:The correct answer is c. A bus topology has all the nodes connected to a coaxial cable. A star topology has all the nodes connected to a central hub. Therefore, answer a is incorrect. A ring topology makes connections from computer to computer. Therefore, answer b is incorrect. A fully meshed network is a routed network such as the Internet. Therefore, answer d is incorrect.
3. What is the Telnet port?
A) 23
B) 80
C) 110
D) 25
Correct Answer (s):A) 23
Explanation:The correct answer is a. The Telnet TCP port is 23. HTTP is port 80. Therefore, answer b is incorrect. POP3 is port 110. Therefore, answer c is incorrect. SMTP is port 25. Therefore, answer d is incorrect.
4. Which network topology has all the nodes connected to the node before it and the node after it in the topology?
A) Star
B) Ring
C) Bus
D) Fully meshed
Correct Answer (s):B) Ring
Explanation:The correct answer is b. A ring topology makes a connection from computer to computer and passes an access token around the network. A star topology has all the nodes connected to a central hub. Therefore, answer a is incorrect. A bus topology has all the nodes connected to a coaxial cable. Therefore, answer c is incorrect. A fully meshed network is a routed network such as the Internet. Therefore, answer d is incorrect.
5. Which network devices work at the OSI NETWORK Link layer? [Choose the two bestanswers]
A) Switch
B) Hub
C) NIC
D) Bridge
E) Router
F) Gateway
Correct Answer (s): A) Switch D) Router
Explanation:The correct answers are a and d. The characteristic of a device that works at the Data Link layer is that it uses the MAC address to forward packets to the proper destination. A hub and NIC work at the Physical layer of the OSI model. Therefore, answers b and c are incorrect. A router works at the Network layer of the OSI model. Therefore, answer e is incorrect. A gateway works at layers 5 through 7 of the OSI model. Therefore, answer f is incorrect.
6. Which protocol works only at the Data Link layer of the OSI model?
A) AppleTalk
B) IPX
C) NetBEUI
D) TCP/IP
Correct Answer (s):C) NetBEUI
Explanation:The correct answer is c. The NetBEUI protocol does not have a source and destination network address and therefore is nonroutable. It has to be bridged or switched if it is to be forwarded beyond its own segment. Answers a, b, and d are incorrect because AppleTalk, IPX, and TCP/IP are all routable protocols.
7. Which network device works at the Network layer of the OSI model?
A) Router
B) Hub
C) Gateway
D) Switch
E) Bridge
Correct Answer (s): A) Router
Explanation:The correct answer is a. A router looks at the source and destination network addresses and forwards the packet to the destination. A hub repeats the packet on all the ports. Therefore, answer b is incorrect. A gateway works at layers 5 through 7 of the OSI model. Therefore, answer c is incorrect. A switch and a bridge work at layer 2 of the OSI model. Therefore, answers d and e are incorrect.
8. What is the HTTP port?
A) 110
B) 80
C) 21
D) 25
Correct Answer (s): B) 80
Explanation:The correct answer is b. The HTTP TCP port is 80. POP3 is port 110. Therefore, answer a is incorrect. FTP is port 21. Therefore, answer c is incorrect. SMTP is port 25. Therefore, answer d is incorrect.
9. Which IEEE standard defines the Logical Link Control protocol?
A) 802.2
B) 802.11
C) 802.3
D) 802.5
E) 802.12
Correct Answer (s): A) 802.2
Explanation:The correct answer is a. IEEE 802.2 defines the standard for Logical Link Control. 802.11 defines the standard for wireless networks. Therefore, answer b is incorrect. 802.3 defines the standard for Ethernet networks. Therefore, answer c is incorrect. 802.5 defines the standard for token-passing ring networks. Therefore, answer d is incorrect. 802.12 defines the standard for demand priority access. Therefore, answer e is incorrect.
10. On the coldest days of winter, you notice that the network seems to be unstable in the office areas. What should you look for as the possible cause of the problem?A) A cold air draft near the network equipment
B) Space heaters causing electrical and network interference
C) The cable runs on the outside wall getting too cold
D) Excessive interference caused by the central heating system
Correct Answer (s): B) Space heaters causing electrical and network nterference
Explanation:The correct answer is b. Too many space heaters can cause electrical and network interference. Answer a is incorrect because heat, not cold, is usually a killer of electrical equipment. Answer c is incorrect because it is not a realistic answer. Answer d is incorrect because although the central heating system could interfere with the network, it is usually better grounded and not in close proximity to network resources.
11. What would you use a crossover cable for? [Choose the four best answers]
A) A hub-to-PC connection
B) A PC-to-PC connection
C) A switch-to-PC connection
D) A hub-to-hub connection
E) A hub-to-switch connection
F) A switch-to-switch connection
Correct Answer (s): B) A PC-to-PC connection D) A hub-to-hub connection E) A hub-to-switch connection F) A switch-to-switch connection
Explanation:The correct answers are b, d, e, and f. You would use a crossover cable to connect a PC to a PC, a hub to a hub, a hub to a switch, and a switch to a switch. Answers a and c are incorrect because hub-to-PC and switch-to-PC connections use a straight-through cable.
A) Replace the cable with a new cable
B) Test the cable with a cable tester
C) Terminate the ends again
D) Inspect the cable for defects
Correct Answer (s):B) Test the cable with a cable tester
Explanation:The correct answer is b. All the answers are options to try when you suspecta bad cable, but a cable tester is the only option that does a through-testof the cable.
12. What would be the result of connecting a workstation to a hub when the horizontal cable run was 95 meters and two patch cables are 10 meters each?
A) It would work fine because patch cables are not counted in the length.
B) It is close enough to the maximum length to guarantee reliable connectivity.
C) It is longer than the maximum allowed length, and reliable connectivity cannot be guaranteed.
D) It might or might not work; you won't know until you put it into production.
Correct Answer (s): C) It is longer than the maximum allowed length, and reliable connectivity cannot be guaranteed.
Explanation:The correct answer is c. Horizontal cable runs and patch cables are counted in the total length of a UTP cable run. Answer a is incorrect because patch cables are counted in the total length of the cable. Answers b and d are incorrect because you should never deploy a system when you know that the combined cable lengths exceed the maximum length.
A) Star
B) Ring
C) Bus
D) Fully meshed
Correct Answer (s):A) Star
Explanation:The correct answer is a. A star topology has all the connections returning to a central point that is usually a hub. A ring topology makes a connection from computer to computer. Therefore, answer b is incorrect. A basic bus topology is a Thinnet or Thicknet coaxial network. Therefore, answer c is incorrect. A fully meshed network is usually composed of a routed network. Therefore, answer d is incorrect.
2. Which network topology has all the nodes connected to one coaxial cable?
A) Star
B) Ring
C) Bus
D) Fully meshed
Correct Answer (s):C) Bus
Explanation:The correct answer is c. A bus topology has all the nodes connected to a coaxial cable. A star topology has all the nodes connected to a central hub. Therefore, answer a is incorrect. A ring topology makes connections from computer to computer. Therefore, answer b is incorrect. A fully meshed network is a routed network such as the Internet. Therefore, answer d is incorrect.
3. What is the Telnet port?
A) 23
B) 80
C) 110
D) 25
Correct Answer (s):A) 23
Explanation:The correct answer is a. The Telnet TCP port is 23. HTTP is port 80. Therefore, answer b is incorrect. POP3 is port 110. Therefore, answer c is incorrect. SMTP is port 25. Therefore, answer d is incorrect.
4. Which network topology has all the nodes connected to the node before it and the node after it in the topology?
A) Star
B) Ring
C) Bus
D) Fully meshed
Correct Answer (s):B) Ring
Explanation:The correct answer is b. A ring topology makes a connection from computer to computer and passes an access token around the network. A star topology has all the nodes connected to a central hub. Therefore, answer a is incorrect. A bus topology has all the nodes connected to a coaxial cable. Therefore, answer c is incorrect. A fully meshed network is a routed network such as the Internet. Therefore, answer d is incorrect.
5. Which network devices work at the OSI NETWORK Link layer? [Choose the two bestanswers]
A) Switch
B) Hub
C) NIC
D) Bridge
E) Router
F) Gateway
Correct Answer (s): A) Switch D) Router
Explanation:The correct answers are a and d. The characteristic of a device that works at the Data Link layer is that it uses the MAC address to forward packets to the proper destination. A hub and NIC work at the Physical layer of the OSI model. Therefore, answers b and c are incorrect. A router works at the Network layer of the OSI model. Therefore, answer e is incorrect. A gateway works at layers 5 through 7 of the OSI model. Therefore, answer f is incorrect.
6. Which protocol works only at the Data Link layer of the OSI model?
A) AppleTalk
B) IPX
C) NetBEUI
D) TCP/IP
Correct Answer (s):C) NetBEUI
Explanation:The correct answer is c. The NetBEUI protocol does not have a source and destination network address and therefore is nonroutable. It has to be bridged or switched if it is to be forwarded beyond its own segment. Answers a, b, and d are incorrect because AppleTalk, IPX, and TCP/IP are all routable protocols.
7. Which network device works at the Network layer of the OSI model?
A) Router
B) Hub
C) Gateway
D) Switch
E) Bridge
Correct Answer (s): A) Router
Explanation:The correct answer is a. A router looks at the source and destination network addresses and forwards the packet to the destination. A hub repeats the packet on all the ports. Therefore, answer b is incorrect. A gateway works at layers 5 through 7 of the OSI model. Therefore, answer c is incorrect. A switch and a bridge work at layer 2 of the OSI model. Therefore, answers d and e are incorrect.
8. What is the HTTP port?
A) 110
B) 80
C) 21
D) 25
Correct Answer (s): B) 80
Explanation:The correct answer is b. The HTTP TCP port is 80. POP3 is port 110. Therefore, answer a is incorrect. FTP is port 21. Therefore, answer c is incorrect. SMTP is port 25. Therefore, answer d is incorrect.
9. Which IEEE standard defines the Logical Link Control protocol?
A) 802.2
B) 802.11
C) 802.3
D) 802.5
E) 802.12
Correct Answer (s): A) 802.2
Explanation:The correct answer is a. IEEE 802.2 defines the standard for Logical Link Control. 802.11 defines the standard for wireless networks. Therefore, answer b is incorrect. 802.3 defines the standard for Ethernet networks. Therefore, answer c is incorrect. 802.5 defines the standard for token-passing ring networks. Therefore, answer d is incorrect. 802.12 defines the standard for demand priority access. Therefore, answer e is incorrect.
10. On the coldest days of winter, you notice that the network seems to be unstable in the office areas. What should you look for as the possible cause of the problem?A) A cold air draft near the network equipment
B) Space heaters causing electrical and network interference
C) The cable runs on the outside wall getting too cold
D) Excessive interference caused by the central heating system
Correct Answer (s): B) Space heaters causing electrical and network nterference
Explanation:The correct answer is b. Too many space heaters can cause electrical and network interference. Answer a is incorrect because heat, not cold, is usually a killer of electrical equipment. Answer c is incorrect because it is not a realistic answer. Answer d is incorrect because although the central heating system could interfere with the network, it is usually better grounded and not in close proximity to network resources.
11. What would you use a crossover cable for? [Choose the four best answers]
A) A hub-to-PC connection
B) A PC-to-PC connection
C) A switch-to-PC connection
D) A hub-to-hub connection
E) A hub-to-switch connection
F) A switch-to-switch connection
Correct Answer (s): B) A PC-to-PC connection D) A hub-to-hub connection E) A hub-to-switch connection F) A switch-to-switch connection
Explanation:The correct answers are b, d, e, and f. You would use a crossover cable to connect a PC to a PC, a hub to a hub, a hub to a switch, and a switch to a switch. Answers a and c are incorrect because hub-to-PC and switch-to-PC connections use a straight-through cable.
A) Replace the cable with a new cable
B) Test the cable with a cable tester
C) Terminate the ends again
D) Inspect the cable for defects
Correct Answer (s):B) Test the cable with a cable tester
Explanation:The correct answer is b. All the answers are options to try when you suspecta bad cable, but a cable tester is the only option that does a through-testof the cable.
12. What would be the result of connecting a workstation to a hub when the horizontal cable run was 95 meters and two patch cables are 10 meters each?
A) It would work fine because patch cables are not counted in the length.
B) It is close enough to the maximum length to guarantee reliable connectivity.
C) It is longer than the maximum allowed length, and reliable connectivity cannot be guaranteed.
D) It might or might not work; you won't know until you put it into production.
Correct Answer (s): C) It is longer than the maximum allowed length, and reliable connectivity cannot be guaranteed.
Explanation:The correct answer is c. Horizontal cable runs and patch cables are counted in the total length of a UTP cable run. Answer a is incorrect because patch cables are counted in the total length of the cable. Answers b and d are incorrect because you should never deploy a system when you know that the combined cable lengths exceed the maximum length.