4. The Current Ethernet Specifications

Question 1

On a Ethernet switched network, what adress does one host computer use to communicate with another?

A. IP adress
B. MAC adress
C. Street adress
HUB adress

Answer 1

B.

On a Ethernet network, the MAC adress (hardware adress) is used for one host to communicate with another.

Question 2

Which of the following can run full-duplex and achieve 200 Mbps with Cat 5e cable?

A. 100BaseF
B. 100BaseTX
C. 1000BaseF
D. 1000BaseT

Answer 2

B.

100BaseTX uses Cat 5e and can run 200 Mbps when using full-duplex.

Question 3

How many devices in a collision domain have to listen when a single host talks?

A. Two
B. Three
C. One
D. All

Answer 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

If you are using a cable medium called 10Base2, what does this mean?

A. That you are running Ethernet over HDMI

B. That you are running Ethernet over Fiber

C. That you are running Ethernet over thicknet

D. That you are bundling multiple connections

E. That you are really old and using thinnet COAX for your LAN medium.

Answer 4

E.

10Base2 was one of the very first Ethernet network physical mediums and is a thinnet coax.

Question 5

What network acces control method helps devices share the bandwith evenly without having 2 devices transmit at the same time on the network medium? (Choose 2.)

A. TCP/IP
B. CSMA/CD
C. HTTPS
D. TFTP
E. CSMA/CA

Answer 5

B, E.

Option B carrier sense multiple acces with collision detection (CSMA/CD) helps packets that are transmitted simultaneously from different hosts share bandwith evenly. You might think that CSMA/CD would be the only correct answer, but always think in terms of what is the best answer out all of the options, B and E (CSMA/CA) are both correct. The exam will never have cut-and-dry answers.

Question 6

What is the maximum distance of 10GBaseSR?

A. 100 meters (328 feet)
B. 302 meters (990 feet)
C. 305 meters (1,000 feet)
D. 1,593 km (990 miles)

Answer 6

B.

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

Question 7

How many wire pairs are used with half-duplex?

A. Two
B. One
C. Four
D. None of the above

Answer 7

B.

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

Question 8

How many wire pairs are used with 100BaseTX full-duplex?

A. Two
B. One
C. Four
D. A or C

Answer 8

A.

Full-duplex Ethernet uses 2 pairs of wires at the same time.

Question 9

What is the maximum distance of 10GBaseLR?

A. 1 mile
B. 3 miles
C. 6 miles
D. 25 miles

Answer 9

C.

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

Question 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

B.

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

Question 11

What devices can you not use full-duplex communication with?

A. Host
B. Hub
C. Switch
D. Router

Answer 11

B.

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

Question 12

What is de 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

B.

11000000 is 192.
10101000 is 168.
00110000 is 48.
11110000 is 240.

Question 13

Which IEEE standard is used for Ethernet over power lines?

A. 802.3p
B. 1901
C. 802.16
D. 1918

Answer 13

B.

In Februari 2011, the IEEE finally published a standard for Broadband over Power Line (BPL) called IEEE 1901; this is also referred to as Power Line Communication (PLC) or even Power Line Digital Subscriber Line (PDSL).

Question 14

How is the decimal value 10 represent in binary?

A. 1000
B. 1001
C. 1010
D. 1011

Answer 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

What is the decimal number for the binary number 11101000?

A. 128
B. 194
C. 224
D. 232

Answer 15

D.

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

Question 16

What is the decimal number 10 in hexadecimal?

A. 9
B. A
C. C
D. B

Answer 16

B.

The first 10 hexadecimal digits (0-9) are the same values as the decimal values. We allready 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

How many bits is a MAC adress?

A. 16
B. 32
C. 48
D. 64

Answer 17

C.

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

Question 18

What is the maximum distance of 1000BaseT?

A. 100 meters (328 feet)
B. 128 meters (420 feet)
C. 1,000 meters (3280 feet)
D. 1,024 meters (3360 feet)

Answer 18

A.

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

Question 19

What is the purpose of the frame check sequemce (FCS) in an Ethernet frame?

A. Error correction
B. Error detection
C. Error recovery
D. Creating errors

Answer 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 uncharged.

Question 20

What does Base mean in 100BaseTX?

A. Broadband
B. 100 Mbps
C. Baseband
D. Twisted-pair at 100 Mbps

Answer 20

C.

The 100 means 100 Mbps. The Bases means baseband technology – a signaling method for communications on the network.