Ch. 4

Question 1

1. On an Ethernet switched network, what address does one host computer use to communicate with another?
A. IP address
B. MAC address
C. Street address
D. HUB address

Answer 1

1. B. On an Ethernet network, the MAC address (hardware address) is used for one host to communicate with another.

Question 2

2. Which of the following can run full duplex and achieve 200Mbps with CAT5e cable?
A. 100BaseF
B. 100BaseTX
C. 1000BaseF
D. 1000BaseT

Answer 2

2. B. 100BaseTX uses CAT 5e and can run 200Mbps when using full duplex.

Question 3

3. How many devices in a collision domain have to listen when a single host talks?
A. 2
B. 3
C. 1
D. All

Answer 3

3. D. When one device sends a packet out on a network segment, all other devices on the same physical network segment must wait and let it be transmitted.

Question 4

4. If you are using a cable medium called 100BaseTF, what does this mean?
   A. That you are running Ethernet over cable
   B. That you are running Ethernet over fiber
   C. That you are running Ethernet over ThickNet
   D. That you are bundling multiple connections

Answer 4

4. B. 100BaseTF means that you have an Ethernet over fiber cable implementation.

Question 5

5. What protocol helps devices share the bandwidth evenly without having two devices transmit at the same time on the network medium?
A. TCP/IP
B. CSMA/CD
C. HTTPS
D. TFTP

Answer 5

5. B. Carrier Sense Multiple Access with Collision Detection (CSMA/CD) helps packets that are transmitted simultaneously from different hosts share bandwidth evenly.

Question 6

6. What is the maximum distance of 10GBaseSR?
A. 100 meters (328 feet)
B. 302 meters (990 feet)
C. 305 meters (1000 feet)
D. 1593 km (6 miles)

Answer 6

6. B. A 10GBaseSR cable can have a maximum distance of 990 feet (302 meters).

Question 7

7. How many wire pairs are used with half duplex?
A. 2
B. 1
C. 4
D. None of the above

Answer 7

7. B. With half duplex, you are using only one wire pair with a digital signal either transmitting or receiving.

Question 8

8. How many wire pairs are used with 100BaseT full duplex?
A. 2
B. 1
C. 4
D. A or C

Answer 8

8. A. Full-duplex Ethernet uses two pairs of wires at the same time.

Question 9

9. What is the maximum distance of 10GBaseLR?
A. 1 mile
B. 3 miles
C. 6 miles
D. 25 miles

Answer 9

9. C. A 10GBaseLR implementation can go a distance of up to 6 miles.

Question 10

10. What is the effective total throughput increase with a full-duplex connection?
A. None
B. Twice as much
C. Four times as much
D. Ten times as much

Answer 10

10. B. Double up! You can get 20Mbps with a 10Mbps Ethernet running full duplex or 200Mbps for Fast Ethernet.

Question 11

11. What device can you not use full-duplex communication with?
A. Host
B. Hub
C. Switch
D. Router

Answer 11

11. B. Full-duplex communication cannot be used with a hub because a hub is a half-duplex single communication device. A host, switch, and router have the ability to process traffic (frames), whereas a hub is a multiport repeater.

Question 12

12. What is the decimal equivalent of this binary number: 11000000.10101000.00110000.11110000?
A. 192.168.48.192
B. 192.168.48.240
C. 192.168.64.224
D. 192.168.32.248

Answer 12

12. B. 11000000 is 192, 10101000 is 168, 00110000 is 48, and 11110000 is 240.

Question 13

13. Which technology increases the bandwidth for network transmission by joining together multiple connections in one logical connection?
A. Bonding
B. VLANs
C. STP
D. Traffic shaping

Answer 13

13. A. Bonding can increase bandwidth and provide redundancy for devices that have multiple links connected together.

Question 14

14. How is the decimal value 10 represented in binary?
A. 1000
B. 1001
C. 1010
D. 1011

Answer 14

14. C. Nibble values are 8 + 4 + 2 + 1, giving us a maximum value of 15. If we have a decimal value of 10, that means the 8 bit and the 2 bit are turned on.

Question 15

15. What is the decimal value for the binary number 11101000?
A. 128
B. 194
C. 224
D. 232

Answer 15

15. D. The 128, 64, 32, and 8 bits are on, so just add the values: 128 + 64 + 32 + 8 = 232.

Question 16

16. What is the decimal number 10 in hexadecimal?
A. 9
B. A
C. C
D. B

Answer 16

16. B. The first 10 hexadecimal digits (0–9) are the same values as the decimal values. We already know the binary value for the number 10 is 1010—in hex, the number 10 needs to be displayed as a single character. To display double-digit numbers as a single character, we substitute letters. In our example, 10 is A.

Question 17

17. How many bits is a MAC address?
A. 16
B. 32
C. 48
D. 64

Answer 17

17. C. A MAC, or hardware, address is a 48-bit (6-byte) address written in hexadecimal format.

Question 18

18. What is the maximum distance of 1000BaseT?
A. 100 meters (328 feet)
B. 128 meters (420 feet)
C. 1000 meters (3280 feet)
D. 1024 meters (3360 feet)

Answer 18

18. A. 100BaseT and 1000BaseT both have a maximum distance of 100 meters, or 328 feet.

Question 19

19. What is the purpose of the Frame Check Sequence (FCS) in an Ethernet frame?
A. Error correction
B. Error detection
C. Error recovery
D. Creating errors

Answer 19

19. B. The FCS can detect frames in the sequence by calculating the cyclic redundancy check (CRC), which verifies that all the bits in the frame are unchanged.

Question 20

20. What does the Base mean in 100BaseTX?
A. Broadband
B. 100Mbps
C. Baseband
D. Twisted-pair at 100Mbps

Answer 20

20. C. The 100 means 100Mbps. The Base means baseband, which refers to baseband technology—a signaling method for communication on the network.