SG: Ch 6: Networking Fundamentals

Question 1

You have been asked to configure a full mesh network with seven computers. How many connections will this require?

A. 6

B. 7

C. 21

D. 42

Answer 1

C. 21

In a mesh network, the number of connections is determined by the formula x × (x – 1) ÷ 2. With seven computers, that amounts to 21 connections.

Question 2

Which of the following is a type of connector used with coaxial cable?

A. RG-6

B. RG-59

C. BNC

D. SC

Answer 2

C. BNC

Coaxial cable can use BNC connectors and F connectors. RG-6 and RG-59 are coaxial standards. SC is a fiber-optic connector.

Question 3

Transmitting at 10 Gbps, how far can signals on an MMF cable travel?

A. 100 meters

B. 550 meters

C. 1 kilometer

D. 40 kilometers

Answer 3

B. 550 meters

Multimode fiber (MMF) can transmit up to 550 meters, depending on the Ethernet specification. Other standards using MMF can transmit only up to 300 meters. If you need to transmit up to 40 kilometers, you will need to use single-mode fiber (SMF).

Question 4

What devices transfer packets across multiple networks and use tables to store network addresses to determine the best destination?

A. Routers

B. Bridges

C. Hubs

D. Switches

Answer 4

A. Routers

Routers are designed to route (transfer) packets across networks. They are able to do this routing, determining the best path to take, based on the internal routing tables that they maintain.

Question 5

You need to put a connector on the end of an Ethernet crossover cable. The existing end has a white and green colored wire at pin 1. What color do you need to make pin 1 on the new end?

A. White/green

B. Green

C. White/orange

D. Orange

Answer 5

C. White/orange

A crossover cable will flip pins 1 and 3 on each end. Therefore, this end needs to have the white/orange wire as pin 1. The correct order for this cable should be white/orange, orange, white/green, blue, white/blue, green, white/brown, brown.

Question 6

What type of device will block unwanted traffic from your network using a set of rules called an ACL?

A. Router

B. Firewall

C. Bridge

D. NAS

Answer 6

B. Firewall

The job of a firewall is to block unwanted network traffic. Firewalls do this by using a list of rules called an access control list (ACL). Routers connect networks to each other, as do bridges. A network attached storage (NAS) device is like a dedicated file server.

Question 7

You are installing a network at a friend’s house, and it’s impossible to run a network cable from one point in the house to another. He does not want to use wireless networking. Which of the following is the best option to get network connectivity between the two points?

A. Power over Ethernet injector

B. Power over Ethernet switch

C. Ethernet over Power

D. Bridge

Answer 7

C. Ethernet over Power

Ethernet over Power can transmit network signals over power lines within a closed circuit, such as a house. It’s the best choice. PoE devices provide power to devices that only have an Ethernet connection available. A bridge is for connecting disparate network segments and dividing collision domains.

Question 8

____________________ is the type of media access method used by NICs that listen to or sense the cable to check for traffic and send only when they hear that no one else is transmitting.

A. Token passing

B. CSMA/CD

C. CSMA/CA

D. Demand priority

Answer 8

B. CSMA/CD

Carrier Sense Multiple Access with Collision Detection (CSMA/CD) specifies that the NIC pause before transmitting a packet to ensure that the line is not being used. If no activity is detected, then it transmits the packet. If activity is detected, it waits until it is clear. In the case of two NICs transmitting at the same time (a collision), both NICs pause to detect and then retransmit the data.

Question 9

Which of the following wireless communication standards is often described in terms of a wireless personal area network?

A. Bluetooth

B. Infrared

C. Cellular

D. Ethernet

Answer 9

A. Bluetooth

Bluetooth networks are often called wireless personal area networks (WPANs).

Question 10

What is the lowest grade of UTP that is rated for 100 Mbps transmission?

A. CAT-5

B. CAT-5e

C. CAT-6

D. CAT-6a

Answer 10

A. CAT-5

CAT-5 was the first UTP standard ratified for 100 Mbps transmissions. Before that, CAT-3 was popular but only supported 10 Mbps. CAT-5e, CAT-6, and CAT-6a all support at least 1 Gbps and came after CAT-5.

Question 11

Which type of coaxial cable is recommended for digital television cable signals?

A. RG-6

B. RG-8

C. RG-58

D. RG-59

Answer 11

A. RG-6

The two RG standards used for cable television are RG-6 and RG-59. Of the two, RG-6 is better because it can run longer distances and can handle digital signals. RG-59 is for analog signals only. RG-8 is thicknet coax, and RG-58 is thinnet coax.

Question 12

If you are going to run a network cable in the space above the drop ceiling in your office, which type of cable should you use?

A. Plenum

B. PVC

C. Coaxial

D. Fiber-optic

Answer 12

A. Plenum

For areas where a cable must be fire retardant, such as in a drop ceiling, you must run plenum-grade cable. Plenum refers to the coating on the sleeve of the cable, not the copper or fiber within the cable itself. PVC is the other type of coating typically found on network cables, but it produces poisonous gas when burned.

Question 13

Which of the following connector types is an MFF connector?

A. BNC

B. ST

C. SC

D. LC

Answer 13

D. LC

The local connector (LC) is a mini form factor (MFF) fiber-optic connector developed by Lucent Technologies. If it helps, think of LC as “Little Connector.”

Question 14

____________________ is immune to electromagnetic or radio-frequency interference.

A. Twisted-pair cabling

B. CSMA/CD

C. Broadband coaxial cabling

D. Fiber-optic cabling

Answer 14

D. Fiber-optic cabling

Companies that want to ensure the safety and integrity of their data should use fiber-optic cable because it is not affected by electromagnetic or radio-frequency interference. Even though some copper cables have shielding, they are not immune to EMI or RFI. This eliminates twisted-pair and coaxial. CSMA/CD is an access method, not a cable type.

Question 15

Of all the network cabling options, ____________________ offers the longest possible segment length.

A. Unshielded twisted-pair

B. Coaxial

C. Fiber-optic

D. Shielded twisted-pair

Answer 15

C. Fiber-optic

Fiber-optic cable can span distances of several kilometers because it has much lower attenuation, crosstalk, and interference as compared to copper cables.

Question 16

Which Ethernet specification would you be running if you needed to make a connection of 10 Gbps over a distance of 5 kilometers?

A. 10GBaseER

B. 10GBaseT

C. 10GBaseSR

D. 10GBaseLR

Answer 16

A. 10GBaseER

If you need to make a connection that is 5 kilometers long, then you are limited to fiber-optic cable—specifically, single-mode fiber (SMF). The two common SMF standards are 10GBaseER and 10GBaseEW. (Think of the E as extended.) A T designation in an Ethernet standard refers to twisted pair. SR and LR are fiber standards that do not stretch for 5 kilometers.

Question 17

A physical star topology consists of several workstations that branch off a central device called a ____________________.

A. NIC

B. Bridge

C. Router

D. Hub

Answer 17

D. Hub

A hub or a switch is at the center of a star topology. A NIC is a network card, which each computer must have to be on the network. Bridges and routers are higher-level connectivity devices that connect network segments or separate networks together.

Question 18

Which of the following networking hardware devices is capable of creating VLANs?

A. Firewall

B. Repeater

C. Unmanaged switch

D. Managed switch

Answer 18

D. Managed switch

A managed switch can create virtual LANs (VLANs) using its management software. A firewall is a hardware or software solution that serves as your network’s security guard. Repeaters and unmanaged switches cannot create VLANs.

Question 19

Which of the following devices work with MAC addresses to determine what to do with network traffic? (Choose two.)

A. Hub

B. Router

C. Bridge

D. Switch

Answer 19

C. Bridge

D. Switch

Bridges and switches are Layer 2 devices; therefore, they work with hardware (MAC) addresses. Hubs operate at Layer 1 and deal with bits, and routers operate at Layer 3 and work with logical IP addresses.

Question 20

Which of the following statements are not associated with a star network? (Choose all that apply.)

A. A single cable break can cause complete network disruption.

B. All devices connect to a central device.

C. It uses a single backbone computer to connect all network devices.

D. It uses a dual-ring configuration.

Answer 20

A. A single cable break can cause complete network disruption.

C. It uses a single backbone computer to connect all network devices.

D. It uses a dual-ring configuration.

In a star network, all systems are connected using a central device, such as a hub or a switch. The network is not disrupted for other users when more systems are added or removed. The star network design is used with today’s UTP-based networks.