The Current Ethernet Specifications

Question 1

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

IP address

MAC address

Street address

Answer 1

MAC address

On an Ethernet network, the MAC address (hardware address) 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?

100BaseF

100BaseTX

1000BaseF

Answer 2

100BaseTX

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?

2

3

1

All

Answer 3

All

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?

That you are running Ethernet over thicknet

That you are bundling multiple connections

That you are really old and using thinnet coax for your LAN medium

Answer 4

That you are really old and using thinnet coax for your LAN medium

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

Question 5

What network access control method helps devices share the bandwidth evenly without having two devices transmit at the same time on the network medium?

TCP/IP

CSMA/CD

HTTPS

Answer 5

CSMA/CD

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

Question 6

What is the maximum distance of 10GBaseSR?

100 meters (328 feet)

302 meters (990 feet)

305 meters (1,000 feet)

Answer 6

302 meters (990 feet)

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

Question 7

How many wire pairs are used with half duplex?

Two

One

Four

Answer 7

One

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

Question 8

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

Two

One

Four

Answer 8

Two

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

Question 9

What is the maximum distance of 10GBaseLR?

1 mile

3 miles

6 miles

Answer 9

6 miles

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

Question 10

What is the effective total throughput increase with a full-duplex connection?

None

Twice as much

Four times as much

Answer 10

Twice as much

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

Question 11

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

Host

Hub

Switch

Answer 11

Hub

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

What is the decimal equivalent of this binary number: 11000000.10101000.00110000.11110000?

192. 168.48.192
193. 168.48.240
194. 168.64.224

Answer 12

192.168.48.240

11000000 is 192, 10101000 is 168, 00110000 is 48, and 11110000 is 240

Question 13

Which IEEE standard is used for Ethernet over Power Lines?

802.3p

1901

802.16

Answer 13

1901

In February 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 represented in binary?

1000

1001

1010

Answer 14

1010

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 value for the binary number 11101000?

194

224

232

Answer 15

232

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?

9

A

C

Answer 16

A

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

How many bits is a MAC address?

16

32

48

Answer 17

48

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

Question 18

What is the maximum distance of 1000BaseT?

100 meters (328 feet)

128 meters (420 feet)

1,000 meters (3280 feet)

Answer 18

100 meters (328 feet)

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

Question 19

What is the purpose of the Frame Check Sequence (FCS) in an Ethernet frame?

Error correction

Error detection

Error recovery

Answer 19

Error detection

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

What does the Base mean in 100BaseTX?

Broadband

100 Mbps

Baseband

Answer 20

Baseband

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