Deck 6: Data Communications

Question 1

The frequency and length of service outages is called .

A) transparency
B) performance
C) availability
D) loss rate
E) latency

Answer 1

C

Question 2

A(n) uses the Internet or other internet to create the appearance of private, point- to- point connections.

A) ethernet
B) ATM
C) SMTP
D) VPN

Answer 2

D

Question 3

A(n) connects computers at different geographic locations.

A) WAN
B) Internet tunnel
C) a root server
D) LAN

Answer 3

A

Question 4

Labor costs are considered when evaluating the costs.

A) operational
B) leasing
C) switching
D) maintenance
E) setup

Question 5

Frame Relay can process traffic up to .

A) 40 Gbps
B) 156 Gbps
C) 156 Mbps
D) 40 Mbps

Question 6

When comparing WANs, managers need to consider what criterium/criteria?

A) maintenance costs
B) setup costs
C) operational costs
D) all of the above
E) none of the above

Question 7

Wireless devices connect to a wireless LAN using a(n):

A) root server.
B) cable.
C) routing table.
D) switch.
E) access point.

Question 8

A(n) _ is a network of networks.

A) internet
B) WAN
C) SOHO
D) LAN

Question 9

communications are secure, even though they are transmitted over the Internet.

A) VPN
B) ATM
C) DSL
D) PSDN
E) Dial- up

Question 10

The one of the most common optical connectors is a(n) .

A) 10/100/1000
B) ST
C) RJ
D) Ethernet

Question 11

consist of computers at a single organizational site that are connected via Unshielded Twisted Pair (UTP) or optical fiber cables.

A) WANs
B) LANs
C) VPNs
D) Tunnels

Question 12

transmits signals using light rays.

A) UTP
B) Coaxial cable
C) Microwave
D) Optical fiber cable

Question 13

IEEE 802.3 is the most popular LAN _ in use today.

A) TLD
B) protocol
C) encryption
D) architecture
E) switch

Question 14

The hardware component that connects a printer's circuitry to the network is called a(n):

A) NIC.
B) internet.
C) router.
D) switch.
E) MAC.

Question 15

In order for a printer or laptop to connect to a wireless LAN they must have a(n):

A) NIC.
B) switch.
C) PPP.
D) browser.
E) WNIC.

Question 16

Problem diagnosis is considered in costs.

A) maintenance
B) leasing
C) switching
D) operational
E) setup

Question 17

Virtual private connections over public networks are called .

A) VPN
B) ATM
C) PSDN
D) direct cables
E) tunnels

Question 18

HTTPS and SSL/TLS utilize which of the following?

A) a combination of public key/private key and asymmetric encryption
B) public keys only
C) asymmetric encryption
D) private keys only
E) a combination of public key/private key and symmetric encryption

Question 19

Computers and printers on a LAN are connected to a(n) to communicate and transmit messages on the LAN.

A) http server
B) routing table
C) root server
D) TLD
E) switch

Question 20

is good for homes and small businesses because they receive more data than they transmit.

A) Optical fiber
B) ADSL
C) UTP
D) SDSL
E) DSL

Question 21

Broadband communications have transmission speeds in excess of:

A) 1024 kbps.
B) 1.2 terabps.
C) 512 kbps.
D) 256 kbps.

Question 22

The protocol which handles messages between a modem and an ISP is known as the .

A) ADSL
B) PPP
C) DSL
D) VPN
E) V.92

Question 23

A(n) _ firewall examines each part of the message and decides whether it will let that part pass through to the network.

A) internal
B) ACL
C) packet- filtering
D) perimeter

Question 24

An organization can design where it will place lines within a(n) .

A) LAN
B) Internet
C) Web
D) WAN
E) MAN

Question 25

Transmission delays that occur during periods of network congestion are known as .

A) performance
B) transparency
C) latency
D) availability
E) loss rate

Question 26

The WiMAX standard is the protocol.

A) 802.11
B) 802.1
C) 802.16
D) 802.3
E) 802.21

Question 27

lines typically have transmission speeds of less than 256 kbps.

A) Thinband
B) Wireless
C) Broadband
D) Narrowband
E) Optical fiber

Question 28

A _ _ must be used to convert an analog signal to a digital one, when trying to transmit data over a typical phone line.

A) modem
B) DSL
C) frame relay
D) tunnel
E) fiber optic switch

Question 29

A large company with production facilities in Houston, Atlanta, and Philadelphia would probably use lines to transmit large amounts of data between the sites.

A) narrowband
B) broadband
C) leased
D) wireless
E) thinband

Question 30

A(n) provides you with a legitimate Internet address and serves as your gateway to the Internet.

A) VPN
B) SMTP
C) TCP/IP
D) switch
E) ISP

Question 31

Vendors develop and maintain leased lines and networks that are called .

A) VPNs
B) DSLs
C) LANs
D) WANs
E) PSDNs

Question 32

is the degree to which the user is unaware of the underlying communications system

A) Performance
B) Latency
C) Loss rate
D) Transparency
E) Availability

Question 33

The site where a leased line connects to a Public Switched Data Network (PSDN) network is called a(n):

A) ISP.
B) POP.
C) root server.
D) switch.
E) VPN.

Question 34

Most onboard NICs support transmission rates of Mbps.
A) 10

A) all of the above
B) 100
B) none of the above
C) 1000

Question 35

A protocol- based technology that delivers last- mile wireless broadband access is _ .

A) ADSL
B) PSDN
C) VPN
D) ATM
E) WiMax

Question 36

VPN codes or messages that are transmitted.

A) packages
B) synchronizes
C) tunnels
D) encrypts
E) direct cables

Question 37

operate on the telephone lines without interfering with phone calls.

A) DSL modems
B) Cable modems
C) Dial- up modems
D) All of the above
E) None of the above

Question 38

Sending a personal email to your friend at work can be an ethical issue at his company because:

A) it took your time away from your family.
B) it had an attachment.
C) it consumed his company's resources.
D) it was a short email.

Question 39

lines are most useful when an organization has large amounts of traffic between two sites.

A) Leased
B) Private
C) Twisted pair
D) Fiber switched
E) WAN

Question 40

modems modulate in such a way that they do not interfere with TV signals, even though they use the same lines.

A) Leased line
B) Cable
C) Dial- up
D) Narrowband
E) DSL

Question 41

Frame relay is less expensive and slower than .

A) DSL
B) PSDN
C) VPN
D) ATM
E) LAN

Question 42

The computers on are usually within half a mile of each other.

A) the Internet
B) a system
C) a root server
D) a LAN
E) a WAN

Question 43

A _ _ is a network of computers and leased lines developed and maintained by a vendor that leases time on the network to other organizations.

Question 44

The is a unique identifier built into the NIC when it is manufactured.

Question 45

Which of the following applies to asymmetric encryption?

A) It is simpler than symmetric encryption.
B) One key encodes the message, one key decodes the message.
C) It is faster than symmetric encryption.
D) Only one key is used.

Question 46

is the dominant WLAN standard today.

A) 802.11a
B) 802.11n
C) 802.11g
D) 802.11b
E) 802.3

Question 47

Most computers today have , which are a hardware component that helps implement the protocols for communication.

Question 48

The access point into the public switched data network is called the .

Question 49

consists of four pairs of twisted wire.

Question 50

When you send your friend an email at his work, the infrastructure to transmit and store that email is only a part of the cost incurred by his company. What other significant cost does your email generate?

A) the space on the company's email server
B) the cost of the gasoline your friend uses to drive to work
C) the cost of the electricity your friend's computer uses
D) the cost of the time your friend takes at work to read and view your email
E) the processing cycles on your friend's company's router

Question 51

To protect their wireless networks, large businesses with sophisticated equipment commonly use special security servers and for secure data transmission.

Question 52

The IEEE 802.3 protocol standard is also known as .

Question 53

A computer is a collection of computers that communicate with one another over transmission lines.

A) application
B) system
C) server
D) network
E) database

Question 54

are special purpose computers that move network traffic between nodes.

A) Routers
B) Switches
C) PSDNs
D) VPNs
E) Modems

Question 55

The Web is a subset of:

A) a system.
B) the Internet.
C) a WAN.
D) a LAN.
E) a root server.

Question 56

A VPN's benefits include:

A) remote access.
B) encryption.
C) point- to- point leased lines.
D) all of the above.
E) none of the above.

Question 57

With encryption, sender and receiver transmit a message using the same key.

Question 58

WNICs operate according to the protocol.

Question 59

provides the same fast speed in both directions on a DSL modem.

Question 60

Modem modulation is governed by the _ standard.

A) V.92
B) PPP
C) DSL
D) ADSL
E) VPN

Question 61

You are connected by no more than five or six to everyone else.

Question 62

must be able to process messages according to both 802.3 and 802.11 standards for a WNIC.

Question 63

When vendors of communications equipment do not meet their they will probably have to pay cost penalties.

Question 64

A _ uses the Internet or other network to create the appearance of private, point- to- point connections.

Question 65

commit vendors to specific levels of service quality.

Question 66

Just because technology enables a(n) _, there is no guaranty that anyone will use it.

Question 67

Dial- up modems use protocol.

Question 68

A collection of computers that communicate with one another over transmission lines is called a .

Question 69

A _ is a device that converts digital signals to analog ones.

Question 70

A network is a set of rules for communications between devices.

Question 71

A _ _ is a number used to encrypt data.

Question 72

Network refers to the frequency and length of service outages.

Question 73

A network of networks is known as a(n) _.

Question 74

To ensure security, VPN client software the original message so that its contents are hidden.

Question 75

A(n) receives and transmits messages on a LAN.

Question 76

A is used to send network traffic between different networks.

Question 77

A WAN alternative that uses the Internet or a private internet to create the appearance of private point- to- point connections is called a .

Question 78

Although slower than asynchronous transfer mode, is simpler and easier to support.

Question 79

In general, the people you know the least, contribute the to your social network.

Question 80

If your organization receives more data than it transmits, digital subscriber lines is the best choice.