Chapter 6 Flashcards
__________________ is immune to electromagnetic or radio-frequency interference.
Twisted-pair cabling
CSMA/CD
Broadband coaxial cabling
Fiber-optic cabling
D. 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
C. 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
C. 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
B. 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
A. 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
D. 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
C. 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
A. 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
D. 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
A. Bluetooth networks are often called wireless personal area networks (WPANs).
Which of the following statements are not associated with a star network? (Choose all that apply.)
A single cable break can cause complete network disruption.
All devices connect to a central device.
It uses a single backbone computer to connect all network devices.
It uses a dual-ring configuration.
A, C, D. 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.
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?
Plenum
PVC
Coaxial
Fiber-optic
A. 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.
Which of the following connector types is an MFF connector?
BNC
ST
SC
LC
D. 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.”
Which Ethernet specification would you be running if you needed to make a connection of 10 Gbps over a distance of 5 kilometers?
10GBaseER
10GBaseT
10GBaseSR
10GBaseLR
A. 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.
You have been asked to configure a full mesh network with seven computers. How many connections will this require?
6
7
21
42
C. 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.
