Unit E: Networks and the Internet
TRUE/FALSE
1. A communications network is the combination of hardware, software, and links that transport data.
2. Bob Metcalfe first described a communications system model in 1948.
3. Because of the risks of unauthorized access and viruses, most businesses opt not to network their
computers.
4. Local Area Networks (LANs) are confined to a single building.
5. Star, bus, ring, and tree are all examples of network topologies.
6. A host computer is any computer that provides services to network users.
7. A star topology connects each network device to many other network devices.
8. Servers and workstations can both be considered to be nodes on a network.
9. A logical address is built into the circuitry of a network device when it is manufactured.
10. A gateway is used to connect two similar networks.
11. The device shown in the figure above is a wireless network card.
12. Modulation means changing the characteristics of a signal, such as from analog to digital.
13. A repeater is a network device that demodulates signals.
14. Coaxial cables are bundles of thin tubes of glass that convert data into light pulses using lasers.
15. Radio waves have more carrying capacity than microwaves.
16. Data in a wired network travels between devices using cables.
17. Protocols are rules that ensure accurate and orderly transmission and reception of data.
18. An Ethernet is an intranet that provides private, external access.
19. Voice over IP and Internet telephony are the same thing.
20. Ethernet is the leading technology for wireless networks.
21. A collision occurs when two signals travel over the network at the same time.
22. Wireless networks are great for computers such as notebooks and tablets that do not need to be
constantly plugged into an outlet.
23. Blu-ray is a short-range wireless network technology that connects devices such as mice, keyboards,
and printers.
24. To access the Internet, you connect your computer directly to the Internet backbone.
25. Traceroute is a software utility that records the path of a packet as it travels from your computer to its
destination.
26. Most Internet connections have a faster upstream than downstream transmission rate.
27. ISPs can provide services that allow your computer to function as an Internet server.
28. The organization ICANN reviews and rates Web site content.
29. A temporarily assigned IP address is called a static IP address.
30. The top-level domains biz and com are both unrestricted and usually used for businesses.
31. When you use an ISP to access the Internet, as shown in the above figure, data travels from your local
telephone switch through your ISP, then to the Internet.
32. Circuit switching is less efficient than packet switching.
33. DSL connections are fast, because data doesn’t need to be switched from analog to digital.
34. A head-end is where cabling systems branch out in order to reach consumers’ homes.
35. CATV cable has enough bandwidth to support TV channels and data flowing up and downstream.
36. With an always-on connection, your computer is susceptible to attack even when it is turned off.
37. The range of wireless network coverage is called a Wi-Fi hotspot.
38. A disadvantage of WAP-enabled devices is that they are not easily portable.
39. The connection shown in the above figure uses satellites to connect to the Internet.
40. The connection shown in the above figure can come in either digital or fixed-wireless.
MULTIPLE CHOICE
1. A(n) ____ shares hardware and software among authorized users.
a.
network
c.
hyperlink
b.
Internet
d.
transmitter
2. Which of the following is a disadvantage to networks?
a.
increased software costs
c.
unauthorized access
b.
increased hardware costs
d.
data sharing
3. A network where workstations store network data and every computer is equal is called a ____
network.
a.
local area
c.
peer-to-peer
b.
star
d.
narrowband
4. The classifications PAN, LAN, WAN, NAN, and MAN indicate the ____ of a network.
a.
geographical scope
c.
physical topology
b.
bandwidth
d.
communications protocol
5. A(n) ____ topology features a central connection point for all workstations and peripheral devices.
a.
ring
c.
tree
b.
star
d.
bus
6. Networks that use different topologies and technologies can be connected using a(n) ____.
a.
bridge
c.
gateway
b.
node
d.
driver
7. The network shown in the figure above is an example of a(n) ____ network.
a.
star
c.
tree
b.
bus
d.
mesh
8. A(n) ____ sends and receives signals in a wireless network.
a.
transceiver
c.
repeater
b.
Ethernet card
d.
modem
9. Which of the following is NOT a type of modem?
a.
cable
c.
wireless
b.
voiceband
d.
repeater
10. A(n) ____ cable is high capacity, and is the type used for cable television.
a.
fiber-optic
c.
USB
b.
coaxial
d.
twisted-pair
11. A(n) ____ on a satellite receives, amplifies, and resubmits signals to the ground station.
a.
transceiver
c.
transponder
b.
hub
d.
repeater
12. A packet is:
a.
a parcel of data sent over a network.
c.
a connection point on a network.
b.
a type of network protocol.
d.
another term for a byte.
13. ____ is a technology that establishes a dedicated, private link between telephones for the duration of a
call.
a.
packet switching
c.
TCP/IP
b.
handshaking
d.
circuit switching
14. Which of the following is NOT true about Ethernet technology?
a.
CSMA/CD protocol detects collisions and
resets the network.
c.
Ethernets are difficult to implement and
maintain.
b.
Ethernets are the standard for wired
networks.
d.
Most Ethernet hubs serve as routers.
15. The use of unsecured wireless networks by hackers is called ____.
a.
WEP
c.
LAN-jacking
b.
evil twins
d.
colliding
16. Which of the following is NOT true about Wi-Fi technology?
a.
A license is needed to operate a wireless
network.
c.
Wi-Fi networks use radio waves to
transmit data.
b.
War driving is illegal.
d.
The range of a Wi-Fi is 25 to 150 feet.
17. The method currently used to measure modem speed is called ____.
a.
baud rate
c.
frequency
b.
bits per second
d.
DSL
18. ____ is a software utility that can indicate whether a site is up, or if a packet was lost in transmission.
a.
Bluetooth
c.
Traceroute
b.
POTS
d.
Ping
19. A(n) ____ IP address is permanently assigned.
a.
dynamic
c.
logical
b.
domain
d.
static
20. In the URL www.course.com, the domain name is ____.
a.
course
c.
course.com
b.
com
d.
www
21. The figure above shows a computer connecting to the Internet through: ____.
a.
a cable modem
c.
circuit switching
b.
POTS
d.
the Internet backbone
22. Which of the following is true about DSL lines?
a.
DSL lines cannot be used for voice calls.
c.
Signal strength is not determined by
location.
b.
ISDN lines are faster.
d.
DSL is an example of an always-on
connection.
23. If your cable modem uses ____ circuitry, it can be connected to your computer using only a USB
cable.
a.
Ethernet
c.
ISDN
b.
CATV
d.
infrared
24. In order to offer TV and Internet access, cable’s bandwidth is divided among all of the following
activities EXCEPT ____ signals
a.
outgoing data
c.
voiceband
b.
incoming data
d.
television
25. The connection shown in the above figure uses ____ to connect to the Internet.
a.
cables
c.
POTS
b.
satellites
d.
Bluetooth
26. Which of the following is NOT true about WAP-enabled devices?
a.
They have small, low-resolution screens.
c.
They contain a microbrowser.
b.
They are portable.
d.
They use co-axial cables.
27. A(n) ____ is the range of service for a public Wi-Fi.
a.
LAN
c.
WAN
b.
hotspot
d.
WiMAX
COMPLETION
1. Bob Metcalfe called his plan for transporting data over a network of computers a(n)
____________________.
2. ____________________ measures the capacity of a network for carrying data.
3. A ____________________/server network consists of one computer acting as the host to workstations.
4. Each connection point on a network is called a(n) ____________________.
5. A(n) ____________________ topology connects devices through a common backbone cable.
6. A(n) ____________________ topology connects all devices in a circle.
7. A(n) ____________________ is a device that converts signals from a computer into signals that can
travel over a network.
8. A(n) ____________________ is a network device that connects several nodes of a LAN.
9. ____________________ light carries data signals for short distances and with a clear line of sight.
10. A(n) ____________________ system, such as telephones, has a lower transmission capacity.
11. ____________________ is a software utility that sends a signal to an Internet address and waits for a
reply.
12. A(n) ____________________ is an abrupt and unwanted variation of signals traveling over the
Internet.
13. 204.127.129.001 is an example of a(n) ____________________ address.
14. Biz, com, edu, and gov are all examples of top-level ____________________.
15. A(n) ____________________ is used to connect both the cable modem and a TV to a single CATV
cable.
16. A(n) ____________________ is a cell phone that can also do e-mail, gaming, and Web browsing.
MATCHING
Match the Internet protocol with its function.
a.
TCP/IP
d.
FTP
b.
HTTP
e.
SMTP
c.
POP
1. Transfers e-mail messages from client computers to an e-mail server.
2. Breaks messages into packets and addresses them to be sent over the Internet.
3. Exchanges information over the Web.
4. Transfers files between local and remote host computers.
5. Transfers mail from an e-mail server to a client Inbox.
Match the network technology with its description.
a.
WAN
e.
modem
b.
Star topology
f.
P2P
c.
Bus topology
g.
transceiver
d.
repeater
h.
Traceroute
6. Connects workstations and devices through a central point.
7. A device with an antenna that sends and transmits data over a wireless network.
8. Device that amplifies and regenerates signals so they are strong enough to reach their destination.
9. An example is the Internet.
10. Connects network devices through a common backbone.
11. Software that records a packet’s path.
12. Treats every computer as an equal.
13. Converts digital signals from a computer so they can travel over the Internet.
ESSAY
1. Describe some of the advantages and disadvantages of networks.
2. There are many types of networks, classified by the geographic area they cover. Choose three, and
describe the scope of their access.
3. Describe three of the disadvantages to wireless networks.
4. Describe the differences between the following Internet connections: POTS, DSL, and cable.