Chapter 7

Question 1

What is a network adapter?

Answer 1

A device that converts data into electronic signals. The device listens for silence on the network and applies data to it when the opportunity arises. The device uses media access control to know the address of every computer connected to the network.

Question 2

What is a network medium?

Answer 2

Wired network need cable. The most common type of cable is called unshielded twisted pair. Other types of cables are twin-axial, Shielded twisted pair, and fiber optic. The wired medium must fall in line with the standards of Ethernet.

Question 3

What is a cable connector?

Answer 3

The part of the cable that plugs into a port to connect one device with another.

Question 4

What is a power supply?

Answer 4

Component that supplies power to at least one electrical load. Converts one type of electrical power to another.

Question 5

What is a hub?

Answer 5

A common connection point for devices in a network. Commonly used to connect segments of a LAN. The hub contains multiple ports. When a packet arrives at one port it is copied to all the other ports. This is done so that all the segments of a LAN can see all the packets.

Question 6

What is a switch?

Answer 6

A device that connects devices together on a network by using packet switching to receive, process, and forward data to the destination device.

Question 7

What is a router?

Answer 7

A device that forwards data packets between computer networks. The device performs traffic directing functions on the Internet. A data packet is typically forwarded from one device to another.

Question 8

What is network software?

Answer 8

Software that packages data into segments and puts the data into a packet. The source and destination address are written into the packet. The receiving computer needs to interpret the packets back into meaningful data and deliver it to the appropriate application.

Question 9

What is Radio NIC?

Answer 9

A network interface controller that connects to a radio-based computer network.

Question 10

What is a wireless AP?

Answer 10

A wireless Access Point contains a radio card that communicates with individual devices. Software within the access point bridges together the segments of the WLAN.

Question 11

What is a repeater?

Answer 11

A device used to regenerate or replicate a signal. Used in a network to regenerate analog or digital signals distorted by transmission loss. Analog repeaters can amplify a signal while digital repeaters can construct a signal near to its original quality.

Question 12

What is Antennae?

Answer 12

Most are omnidirectional devices that have low gain. Nearly all access points, routers, and repeaters come with antennae.

Question 13

What are dedicated servers?

Answer 13

Unmanaged servers are handled directly by the client while host only handles the storage of data. Managed servers are controlled by the host while client works with data.

Question 14

What is peer-to-peer?

Answer 14

A distributed application architecture that partitions tasks between equally privileged and powerful peers.

Question 15

What is a dedicated server?

Answer 15

A single computer reserved for serving the needs of the network.

Question 16

What is a NOS?

Answer 16

A Networking Operating System is an operating system oriented to computer networking to allow the sharing of data over a LAN.

Question 17

What is a domain?

Answer 17

A subnetwork made up of a group of clients and servers under the control of one security database. Within a domain users authenticate once to a centralized server.

Question 18

What is a network profile?

Answer 18

A record of user-specified data that define the users working environment. The record can include display, application, and network settings.

Question 19

What is a physical topology?

Answer 19

A physical topology defines how nodes in a network are physically linked and include aspects geographic location, distances between nodes, and strength of network links.

Question 20

What is CSMA/CD?

Answer 20

Carrier-sense Multiple Access with Collision Detection is a media access control method used in early Ethernet technology for a LAN. Uses a carrier-sensing scheme in which a transmitting station detects collisions by sensing transmissions from other stations while transmitting a frame. When a collision is detected the transmitter is stopped from transmitting. The transmitter then waits a random interval of time before trying to resend the frame.

Question 21

What is CSMA/CA?

Answer 21

Carrier-Sense Multiple Access with Collision Avoidance is a multiple access method in which carrier sensing is used, but nodes attempt to avoid collisions by transmitting only when the channel is sensed to be idle. When nodes do transmit, they transmit packets in their entirety.

Question 22

What is switched Ethernet?

Answer 22

An Ethernet LAN that uses switches to connect individual hosts or segments.

Question 23

What is MAC?

Answer 23

Media Access Control provides flow control and multiplexing for logical link. When sending data to another device MAC encapsulates frames appropriate for the transmission medium. MAC adds a frame check sequence to identify transmission errors. MAC also controls when data is sent in order to avoid collisions.

Question 24

What is layer-2 switched Ethernet?

Answer 24

Operates at the data link layer (layer 2) of the OSI model to create a separate collision domain for each switch port.

Question 25

What is RAID?

Answer 25

Redundant Array of Inexpensive Disks is a data storage virtualization technology that combines multiple physical disk drive components into one or more logical units for the purposes of data redundancy, performance improvement, or both.

Question 26

What media is used in backbone network?

Answer 26

Fiber-Optic cable.

Question 27

What are the types of Ethernet?

Answer 27

10 Base-T= 10 Mbps, 100 Base-T= 100 Mbps, 10GbE= 1 Gbps, 10GbE= 10 Gbps, 40 GbE= 40 Gbps all use either fiber-optic or twisted-pair cable.

Question 28

What are the types of wireless Ethernet?

Answer 28

802.11a= 54 Mbps, 802.11b= 11 Mbps, 802.11g= 54 Mbps, 802.11n= 450 Mbps, 802.11 ac= 2.4 to 5 GHz all types use Wi-Fi.

Question 29

What are the Wi-Fi standards?

Answer 29

802.11a= obsolete standard, eight channels, 54 Mbps, max of 150 feet; 802.11b= obsolete standard, three channels, 11 Mbps, max of 450 feet; 802.11g= obsolete standard, three channels 54 Mbps, max of 450 feet; 802.11n= obsolete standard, continued use, cheap design, three channels, 450 Mbps, max of 300 feet; 802.11ac= latest standard, two frequency spectrums, very high speed rates; 802.11ad= specialized standard, max of 30 feet, cannot penetrate walls, 7 Gbps

Question 30

What causes bottleneck in LAN?

Answer 30

Demand of software on servers, amount of memory in server, number and speed of hard disks in server.

Question 31

What is a logical topology?

Answer 31

A logical topology is an arrangement of devices on a network and how they communicate with one another. A Logical topology describes how signals act on the network.