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Data Communications > 001-006 > Flashcards

001-006 Flashcards

1
Q

is the exchange of data between two devices via a transmission medium

A

Data Communications

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2
Q

Four Fundamental Characteristics of Data Communications

A
  1. Delivery
  2. Accuracy
  3. Timeliness
  4. Jitter
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3
Q

Data Representations

A
  1. Text
  2. ASCII
  3. Extended ASCII
  4. UNICODE
  5. ISO
  6. Numbers
  7. Images
  8. Audio
  9. Video
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4
Q

Direction of Data Flow

A
  1. Simplex - one way
  2. Half Duplex - one at a time
  3. Full Duplex - both all the time
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5
Q

Set of devices connected by communication links

A

Network

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6
Q

When task is divided among computers

A

Distributed processing

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7
Q

Network Criterias

A
  1. Performance
  2. Reliability
  3. Security
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8
Q

Types of Connection

A
  1. Point-to-Point
  2. Multipoint
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9
Q

Physical Topologies

A
  1. Mesh
  2. Star
  3. Bus
  4. Ring
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10
Q

Every device has a dedicated point to point link to every other device

A

Mesh topology

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11
Q

Every device has a dedicated point to point link only to a central controller

A

Star topology

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12
Q
  • is multipoint.
  • One long cable acts as a backbone to link all the devices in a network
A

Bus topology

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13
Q

each device has a dedicated point-to-point connection with only the two devices on either side of it.

A

Ring topology

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14
Q

Categories of Network

A

LAN
MAN
WAN

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15
Q

Early: 4-16 Mbps
Today: 100-1000 Mbps

A

LAN

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16
Q
  • Group of connected communicating devices
  • 2 or more network that can communicate with each other
A

Internet

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17
Q

Set of rules that governs data comms

A

Protocols

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18
Q

It is the structure or format of the data

A

Syntax

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19
Q

It is the meaning of each section of bits

A

Semantics

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20
Q

It is when data should be sent and how fast it should be sent

A

Timing

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21
Q

Data Communication Standards

A

de facto
de jure

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22
Q

Standards that have not been approved but adopted as one

A

de facto

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23
Q

Officially recognized standards

A

de jure

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24
Q

Standards Organizations

A

ISO
ITU-T
ANSI
IEEE
EIA

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25
Q

OSI MODEL LAYERS

A

APSTNDP

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26
Q

It is the adding of headers/data packets

A

Encapsulation

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27
Q

removing of headers/data packets

A

Decapsulation

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28
Q

Provides interface to the network

A

Application layer

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29
Q

Converts codes & reformats data

A

Presentation layer

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30
Q

Layer concerned w/ syntax and semantics of data transmitted

A

Presentation layer

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31
Q

Coordinates interaction between end-to-end application process

A

Session layer

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32
Q

handles reliable delivery of messages

A

Transport layer

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33
Q

Routed Protocols

A

IP
AppleTalk
IPX

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34
Q

Routing Protocols

A

Distance Vector
Link State
Hybrid

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35
Q

Types of Distance Vector Routing protocols

A

RIP
IGRP

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36
Q

Types of Link State Routing protocols

A

OSPF
IS-IS

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37
Q

Types of Hybrid Routing protocols

38
Q

Layer responsible for framing, error control, and flow control

A

Data Link layer

39
Q

Layer 2 Devices

A

Bridge (software based)
Switch (ASIC based)

40
Q

Take Note

A

Encapsulation

App data:
Data Unit

TCP header + App Data:
Segment

IP header + TCP header + App data:
Packet

Data link + TCP header + App data:
Frame

10010001000100:
Bit stream

41
Q

Provides hardware addressing

A

MAC sublayer

42
Q

Common Methods of MAC

A

Contention
- CSMA/CD (IEEE 802.3)
Token Passing
- Token Bus (IEEE 802.4)
- Token Ring (IEEE 802.5)
Polling
- Any LAN (IEEE 802.12)

43
Q

TCP/IP Layers

A

Application layer
Transport layer
Internet layer
Network Interface layer

44
Q

Application, presentation, and session layer of the OSI Model corresponds to what layer of the TCP/IP Model?

A

Application layer

45
Q

Transport layer of the OSI Model corresponds to what layer of the TCP/IP Model?

46
Q

Network layer of the OSI Model corresponds to what layer of the TCP/IP Model?

A

Internet layer

47
Q

Data link and Physical layer of the OSI Model corresponds to what layer of the TCP/IP Model?

A

Network Interface layer

48
Q

Provides Ip address-to-MAC address name address resolution

A

Address Resolution Protocol (ARP)

49
Q

Enables the workstation to boot without requiring a hard or floppy disk drive.

A

Bootstrap Protocol (BootP)

50
Q
  • Permits a physical address, such as an Ethernet address, to be translated into an Ip address.
  • define in RFC 903
A

Reverse Address Resolution Protocol (RARP)

51
Q

It is a connectionless protocol that makes routing path decisions, based on the information it receives from ARP.

A

Internet Protocol (IP)

52
Q

It is the main protocol of TCP/IP protocol

A

Internet Protocol (IP)

53
Q

It provides connection-oriented services and performs segment sequencing and service addressing.

A

Transmission Control Protocol (TCP)

54
Q
  • It is like TCP but not connection-oriented
  • travels data faster but not reliable
A

User Datagram Protocol (UDP)

55
Q

Used by web browsers and web servers to exchange files through the world wide web and intranets.

A

HyperText Transfer Protocol (HTTP)

56
Q

Secures messages being transmitted on the Internet.

A

Secure Socket Layer (SSL)

57
Q

Ensures that messages transferred on the internet are private and tamper proof

A

Transport Layer Security (TLS)

58
Q

Provides a generic method of transferring files

A

File Transfer Protocol (FTP)

59
Q
  • Lets you transfer files between a host and an FTP server.
  • It provides no authentication and uses UDP instead of TCP
A

Trivial File Transfer Protocol (TFTP)

60
Q

File transfer protocol that uses Secure Shell

A

Secure File Transfer Protocol (SFTP)

61
Q

SSH stands for

A

Secure Shell

62
Q

Is used to route electronic mail through the internetwork.

A

Simple Mail Transfer Protocol (SMTP)

63
Q

Is an email retrieval protocol designed to enable users to access their email from various locations …

A

Internet Message Access Protocol (IMAP)

64
Q

Designed for managing Complex Networks

A

Simple Network Management Protocol (SNMP)

65
Q

Acts as a dumb terminal

66
Q

Allows for secure interactive control of remote systems.

A

Secure Shell (SSH)

67
Q

Enables users on various platforms to seamlessly access files from remote file systems

A

Network File System (NFS)

68
Q

Establishes connection between printing devices and workstations

A

Line Printer Daemon (LPD)
or
Line Print Remote (LPR)

69
Q

Distributed through the internetwork to provide address/name resolution

A

Domain Name System (DNS)

70
Q

Used to communicate time synchronization information between systems on a network

A

Network Time Protocol (NTP)

71
Q

allow searching and updating of a directory service

A

Lightweight Directory Access Protocol (LDAP)

72
Q

oversees global IP address allocation

A

Internet Assigned Numbers Authority (IANA)

73
Q

ICANN

A

Internet Corporation for Assigned Names and Numbers

74
Q

ICANN Categories of Ports

A

Well Known
Registered
Dynamic

75
Q

Ports
- Assigned for specific protocols and services
- Ranges from 0 to 1023

A

Well Known Ports

76
Q

Port numbers range from 1024 to 49151

A

Registered

77
Q

Port numbers range from 49152 to 65535

78
Q

Identifies both the logical host and the logical network addresses

A

Ip Address

79
Q

Identifies which portion of the IP address is the network address

A

Subnet Mask

80
Q

Identifies the router to which packets from remote networks are sent

A

Default Gateway

81
Q

Identifies the DNS server that is used to resolve host names to IP addresses

A

DNS Server

82
Q

Identifies the logical name of the local system

83
Q

Identifies the physical Address

A

MAC Address

84
Q
  • Most widely installed local area network technology
  • originally developed by Xerox
85
Q

Is defined by data link and physical layer

86
Q

Used to map data to a particular process running in a computer

87
Q

Each host can have ______ ports per IP address

88
Q

T568A Standard cable connection

A

WG, G, WO, B, WBl, O, WBr, B

89
Q

T568B Standard cable connection

A

WO, O, WG, B, WBl, G, WBr, B

Data Communications (6 decks)

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