Deck 6: Data Communications

Question 1

Layered protocol is an elaborate scheme to provide seamless flow of data in networks like the Internet.

Answer 1

True

Question 2

The university would employ a WAN to connect its Denver and Boulder campuses.

Answer 2

True

Question 3

IEEE 8022.3 is also known as Ethernet.

Answer 3

True

Question 4

Most personal computers today are equipped with an onboard NIC that supports what is called 10/100/1000 Ethernet.

Question 5

Twisting the wires in UTP is done to reduce the space the cable takes.

Question 6

All networks follow an industry standard protocol for data transmission.

Question 7

A computer network is a group of connected computers that communicate with each other.

Question 8

A device called a switch is used to connect the UTP cable into NIC devices on the LAN.

Question 9

New computers today come with onboard NICs.

Question 10

The computer network at the four-block campus of Seattle Grace Hospital would be a LAN.

Question 11

The abbreviations k,m,g have the same meaning for computer memory as they have for communication speeds.

Question 12

Most connections in a LAN are made using unshielded twisted pair (UTP)cable.

Question 13

The most popular protocol for LANs is the IEEE 802.11 protocol.

Question 14

A MAC works with the programs on each device to implement the protocols necessary for communication.

Question 15

Optical fiber cables are wrapped in a cladding to contain the light signals.

Question 16

A computer network between Seattle and Philadelphia is made possible through a LAN.

Question 17

A protocol is a standardized means for coordinating communications between two or more internets.

Question 18

An Internet is a network of networks.

Question 19

The most common connection cable is UTP.

Question 20

The hub is a special-purpose computer that receives and transmits messages on the LAN.

Question 21

When you connect your personal computer to the Internet,you are using a LAN.

Question 22

Narrowband transmission speeds typically do not exceed 56 kbps.

Question 23

ISPs collect money from their customers and pay access fees and other charges on your behalf.

Question 24

T1 lines are the fastest leased lines available.

Question 25

The WNICs operate according to the 802.3 protocol and connect to a router.

Question 26

A router is a special-purpose computer that moves network traffic from one node on a network to another.

Question 27

DSL stands for digital signal line and operates on dedicated cable lines provided by the ISP.

Question 28

Cable modems and DSL modems use the same protocols.

Question 29

With point-to-point lines,the number of lines required does not change as the number of sites increases.

Question 30

T2 speeds can be supported by regular telephone wires.

Question 31

DSL modems use their own protocols for data transmission.

Question 32

A modem converts a TCP/IP signal to a wireless format.

Question 33

EVDO and HSDPA are protocols used by wireless LAN.

Question 34

Symmetrical digital subscriber lines offer the same fast speed for uploads and downloads.

Question 35

In most cases,the speed of cable modems and DSL modems is about the same.

Question 36

Cable modems modulate in such a way that their signals do not interfere with TV signals.

Question 37

PSDN uses Frame Relay and ATM protocols.

Question 38

Performance of networks using a cable modem varies depending on others' use.

Question 39

Whether it is a DSL line,a cable TV line,or a wireless satellite connection,all of them require a modem.

Question 40

There is one standard protocol,EVDO,which is used by all of the wireless providers for WAN connections.

Question 41

One disadvantage of using VPN is that customers cannot use the VPN from their own sites.

Question 42

The packet-filtering firewall is the simplest type of firewall.

Question 43

A Virtual Private Network creates the appearance of a private point-to-point connection.

Question 44

HTTPS is a protocol for secure communication over the Internet.

Question 45

Public switched data network is a network of computers and leased lines that is developed and maintained by a vendor.

Question 46

ATM protocol only supports data communications.

Question 47

Use of SSL/TLS makes it safe to send sensitive data such as credit card numbers and bank balances.

Question 48

Ethernet,the protocol developed for LANs,also is used as a PSDN protocol.

Question 49

With symmetric encryption,different keys are used;one key encodes the message,and the other key decodes the message.

Question 50

Asymmetric encryption is simpler and much faster than symmetric encryption.

Question 51

Leased lines may be a good option if there is a large amount of traffic between a small number of locations.

Question 52

The ACL encodes the rules which contain the firewall's permitted and forbidden addresses.

Question 53

A channel is a virtual,private pathway over a public or shared network from the VPN client to the VPN server.

Question 54

When using a PSDN,each site must lease a line to connect to the PSDN network.

Question 55

The router is the access point into the PSDN.

Question 56

In the special version of asymmetric encryption,public key/private key,the private keys are never communicated.

Question 57

A Frame Relay network is simpler and cheaper to implement than an ATM network.

Question 58

Frame Relay and ATM are the common protocols used in PSDNs.

Question 59

VPN uses software encryption to secure data.

Question 60

A perimeter firewall examines the source address,the destination address(es),and other data to determine whether to let that part pass.

Question 61

Reducing the cross-wire signal interference that occurs when wires run parallel for long distances is made possible by ________.

A)using the RJ-45
B)using OFC
C)twisting the wires in a UTP
D)connecting them using an NIC

Question 62

IEEE 802.3 is also known as ________.

A)TCP/IP
B)Ethernet
C)Netware
D)HTTP

Question 63

The connections between switches can use UTP cable,but if they carry a lot of traffic or are far apart,________.

A)the UTP cable may be twisted to reduce cross-wire signal interferences
B)the UTP cable may be replaced by optical fiber cables
C)an additional NIC card should be placed in the network
D)the UTP cables should given one more layer of cladding

Question 64

A ________ is a set of rules that two communicating devices follow.

A)layer
B)URL
C)permission
D)protocol

Question 65

Which of the following is the distinguishing feature of LANs?

A)single location
B)number of computers
C)bandwidth
D)hardware requirement

Question 66

One of the most common optical connectors is a(n)________ connector.

A)Ethernet
B)10/100/1000
C)ST
D)RJ-45

Question 67

A(n)________ is a special-purpose computer that receives and transmits messages on the LAN.

A)switch
B)NIC
C)router
D)bus

Question 68

Each NIC has a worldwide,unique identifier,called ________.

A)SMTP
B)MAC address
C)URL
D)serial port number

Question 69

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

A)MAC
B)switch
C)router
D)NIC

Question 70

Most onboard NICs support all the following transmission rates except ________.

A)10 Mbps
B)100 Mbps
C)1000 Mbps
D)10000 Mbps

Question 71

To provide seamless flow to networks that comprise an Internet an elaborate scheme called a(n)________ is used.

A)layered protocol
B)networking protocol
C)ISDN
D)Ethernet

Question 72

Computers and printers on a LAN are connected to a ________ to communicate and transmit messages on the LAN.

A)root server
B)networking layer
C)switch
D)routing table

Question 73

IEEE 802.3 is ________.

A)a network protocol for internets
B)the world's most popular protocol for LANs
C)the serial number of the Internet's main server
D)the universal standard protocol for onboard NICs

Question 74

Private networks of networks are called ________.

A)Ethernets
B)internets
C)LANs
D)dedicated networks

Question 75

Communications speeds are measured in ________.

A)bits
B)bytes
C)hertz
D)packets

Question 76

A(n)________ connects computers at different geographic locations.

A)WAN
B)LAN
C)URL
D)Web server

Question 77

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

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

Question 78

IEEE LAN protocols always start with the numbers ________.

A)522
B)100
C)45
D)802

Question 79

A(n)________ connector is used to connect the UTP cable into NIC devices on the LAN.

A)network
B)NIC
C)RJ-11
D)RJ-45

Question 80

An NIC built into the computer's circuitry is called a(n)________.

A)compliance card
B)NIC-2
C)onboard NIC
D)network card