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Question 1

Which Ethernet standard works at 100 Mbps over Cat 5 or better copper cable?

Answer 1

100BASE-TX.

Question 2

A network designer wants to run a 10 gigabit backbone between two switches in buildings that are 75 m (246 feet) apart. What would be the best category of ethernet cabling for these requirements?

Answer 2

At that distance, some type of shielded or screened cat 6A or better cable is required for the installation to be compliant with Ethernet standard 10GBASE-T.

Question 3

What is the measurement standard for wire thickness?

Answer 3

American Wire Gauge (AWG).

Question 4

What are the characteristics of S/FTP cable?

Answer 4

This is a twisted pair type of copper cable using a braided outer screen and foil shielding for each pair to reduce interference.

Question 5

Which categories of U/UTP cable are certified to carry data transmission faster than 100 Mbps?

Answer 5

Cat 5e and Cat 6/6A.

Question 6

True or False? Cat standards apply only to wiring.

Answer 6

False
Connectors and interconnects are also rated to cat standards.

Question 7

Which cable type consists of a single core made of solid copper surrounded by insulation, a braided metal shielding, and an outer cover?

Answer 7

Coax

Question 7

100BASE-T transmit pins are 1 and 2. What color code are the wires terminated to these pins under T568A and T568B?

Answer 7

Green/White (pin 1) and Green (pin 2) for T568A or Orange/White (pin 1) and Orange (pin 2) for T568B.

Question 8

Which grade or grades of fiber have a 62.5 micron core?

Answer 8

OM1

Question 9

What maximum distance is defined in standards documentation for 1000BASE-LX running over MMF?

Answer 9

550 m (1804 feet). Note that 1000BASE-LX can run over MMF or SMF. SMF has much higher range.

Question 10

Which fiber Ethernet standard is best suited to implementing backbone cabling that does not exceed 200 m (656 feet) and can achieve at least 4 Gbps throughput?

Answer 10

10GBASE-SR.

Question 11

You need to provision a fiber patch panel to terminate incoming cabling with green LC connectors. What type of ports should be provisioned on the patch panel?

Answer 11

Green connector color-coding indicates angled physical contact (APC) finishing. This type of finishing is incompatible with PC or UPC ports. The patch panel must be provisioned with Lucent Connector ports with APC finishing type.

Question 12

Which types of distribution frames are best suited to 100 MHz or better operation?

Answer 12

110, BIX, and Krone blocks.

Question 13

What type of distribution frame is best suited to cabling wall ports to Ethernet switches in a way that best supports future changes?

Answer 13

A patch panel allows wall ports to be connected to switches via patch cords. If a switch is replaced or if a wall port needs to be connected to a different switch port, the change can be made easily by moving a patch cord.

Question 14

You need to provision modular SFP+ transceivers to support a 10 gigabit link between two switches using an existing fiber cable. What two characteristics must you check when ordering the transceivers?

Answer 14

Use an appropriate Ethernet standard and wavelength for the type and grade of fiber and link distance (10GBASE-SR versus 10GBASE-LR, for instance) and match the connector type of the existing cable (LC or SC, for instance).

Question 15

You have selected an SFP+ 1310 nm Tx and 1490 nm Rx transceiver to implement a BiDi link between two switches. Should you provision a second SFP+ 1310 nm Tx and 1490 nm Rx for the other switch?

Answer 15

No, you need an SFP+ module with 1490 nm Tx and 1310 nm Rx.

Question 16

You need to run UTP cable between two switches at opposite ends of a warehouse that is 140 m (459 feet) long. What additional device (if any) is required for the installation to be compliant with 1000BASE-TX Ethernet standard?

Answer 16

The maximum link length is 100 m (328 feet) so a repeater will be needed.

Question 17

True or False? Devices can only transmit on an Ethernet network when the media is clear, and the opportunity to transmit becomes less frequent as more devices are added. Also, the probability of collisions increases. These problems can be overcome by installing a hub.

Answer 17

False. The description of the problem is true, but the solution is not. This issue is resolved by using a bridge or (more likely these days) a switch.

Question 17

True or False? A computer with a 10BASE-T Ethernet adapter cannot be joined to a 100BASE-T network.

Answer 17

False. Fast Ethernet is backwards-compatible with 10BASE-T (and Gigabit Ethernet is backwards-compatible with Fast Ethernet).

Question 18

True or false? A bridge does not forward broadcast traffic.

Answer 18

False. Segments on different bridge ports are in separate collision domains but the same broadcast domain.

Question 19

True or False? The CRC mechanism in Ethernet allows for the retransmission of damaged frames.

Answer 19

False. The CRC indicates only that a frame may be corrupt.

Question 20

What is an I/G bit?

Answer 20

Determines whether a frame is addressed to an individual node (0) or group (1). The latter is used for multicast and broadcast.

Question 21

On a switched network, what configuration changes must be made to allow a host to sniff unicast traffic from all hosts connected to a switch?

Answer 21

The switch must be configured to mirror traffic to the sniffer’s port.

Question 22

Write the command to use tcpdump to capture traffic from the IP address 172.16.16.254 on the interface eth0 and output the results to the file router.pcap.

Answer 22

tcpdump -i eth0 -w ‘router.pcap’ src host 172.16.16.254

Question 23

You need to verify whether a switch port is misconfigured by checking the number of collisions being reported. What general command could you use at a CLI to report this information?

Answer 23

show interface

Question 24

True or false? A managed switch should have auto MDI/MDI-X enabled by default.

Answer 24

True

Question 25

A technician configures a switch port with a list of approved MAC addresses. What type of feature has been enabled?

Answer 25

Port security. (Whitelisting)

Question 26

A server has a four-port gigabit Ethernet card. If a switch supports port aggregation, what bandwidth link can be achieved?

Answer 26

4 x 1 gigabit or 4 gigabit.

Question 27

What port configuration feature allows a server to smooth incoming traffic rates?

Answer 27

IEEE 802.3x flow control.

Question 28

Can you safely connect a server to a PoE+ enabled port or should you disable PoE first?

Answer 28

You can connect the server. PoE uses a detection mechanism to determine whether to supply power.

Question 29

Which three means of establishing a theory of probable cause refer to the OSI model?

Answer 29

Top-to-bottom, bottom-to-top, and divide and conquer.

Question 30

True or False? Documentation should be created only at the end of the troubleshooting process.

Answer 30

False. The last step of the methodology is to ensure that findings, actions, and outcomes are documented, but you cannot do this effectively without existing notes. Most troubleshooting takes place within a ticket system. Ideally, a documented job ticket would be opened at the start of recording the incident.

Question 30

When should you escalate a problem?

Answer 30

If you cannot solve it yourself (although it won’t be good for your career if you give up too easily). You might also escalate if you do not have authorization to perform the necessary changes or if the system is under some sort of warranty.

Question 31

What cabling faults would a wire map tester detect?

Answer 31

Opens, shorts, and transpositions (reversed and crossed pairs).