Review Questions CH 6 Networking Fundamentals

_________ is immune to electromagnetic or radio-frequency interference.

• Twisted-pair cabling

• CSMA/CD

• Broadband coaxial cabling

• Fiber-optic cabling

Answer explanation

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.

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

• RG-6

• RG-59

• BNC

• SC

Answer explanation

Coaxial cable can use BNC connectors and F connectors. RG-6 and RG-59 are coaxial

standards. SC is a fiber-optic connector.

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?

• White/green

• Green

• White/orange

• Orange

Answer explanation

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.

___________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.

• Token passing

• CSMA/CD

• CSMA/CA

• Demand priority

Answer explanation

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.

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

• CAT-5

• CAT-5e

• CAT-6

• CAT-6a

Answer explanation

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.

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

called a___________ .

• NIC

• Bridge

• Router

• Hub

Answer explanation

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.

Of all the network cabling options, ___________offers the longest possible

segment length.

• Unshielded twisted-pair

• Coaxial

• Fiber-optic

• Shielded twisted-pair

Answer explanation

Fiber-optic cable can span distances of several kilometers because it has much lower

attenuation, crosstalk, and interference as compared to copper cables.

What devices transfer packets across multiple networks and use tables to store network

addresses to determine the best destination?

• Routers

• Bridges

• Hubs

• Switches

Answer explanation

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.

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

• Firewall

• Repeater

• Unmanaged switch

• Managed switch

Answer explanation

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.

Which of the following wireless communication standards is often described in terms of a

wireless personal area network?

• Bluetooth

• Infrared

• Cellular

• Ethernet

Answer explanation

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