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DATA COMMS > Part 2 > Flashcards

Part 2 Flashcards

1
Q

It is the name for set of standards for communications among computers for the purpose of serving as structural guideline for exchanging information between computers, terminals, and networks. Proposed by ISO and ITU-T

A

Open System Interconnection (OSI)

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2
Q

It looks at physical port and has a unit of information as bits

A

Physical Layer

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3
Q

Its responsibilities include: the actual propagation of unstructured data bits through a transmission medium (which includes how bits are represented, the bit rate, and how bit synchronization is achieved)

A

Physical Layer

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4
Q

Its responsibilities include: providing error-free communications across the physical link ; keeping the integrity of data from node-to-node; providing error detection and error correction; organizing bits into frames, and providing hop-to-hop (node-to- node) delivery.

A

Data Link Layer

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5
Q

It looks for MAC addresses (media access control addresses) and physical port numbers, has a unit of information as frames

A

Data Link Layer

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6
Q

OSI Layer which involves protocols such as ICMP (internet control message protocol), IGMP (internet group management protocol), ARP (address resolution protocol), and RARP (reverse address resolution protocol).

A

Data Link Layer

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7
Q

Its responsibilities include: providing the details that enable data to be routed between devices; determining which network configuration is most appropriate; logical addressing and routing of data (movements with packets from one point to another).

A

Network Layer

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8
Q

It looks at IP addresses, has a unit of information as packets

A

Network Layer

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9
Q

OSI Layer which involves different routing protocols such as RIP (routing information protocol), EIGRP (enhanced interior gateway routing protocol), and OSPF (open shortest path first).

A

Network Layer

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10
Q

It is the highest layer in terms of communications and it acts as the interface between the network and session layers.

A

Transport Layer

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11
Q

Its responsibilities include: controlling and ensuring the end-to- end integrity of the data message propagated through the network; segmenting, error recovery, and the two types of basic services to an upper layer protocol (connection-oriented and connectionless).

A

Transport Layer

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12
Q

It looks at logical port numbers, has a unit of information as segments

A

Transport Layer

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13
Q

OSI Layer which involves protocols such as UDP (user datagram protocol) and TCP (transmission control protocol).

A

Transport Layer

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14
Q

Its responsibilities include: establishing, managing, and terminating sessions; network availability; providing logical connection entities to the application layer ; network log- on and log-off procedures, user authentication, and determining the type of dialogue available (simplex, half duplex, or full duplex).

A

Session Layer

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15
Q

Its responsibilities includes: providing independence to the application processes by addressing any code or syntax conversion necessary to present the data to the network in a common communications format; data file formatting, encoding, encryption and decryption, dialogue procedures, data compression, synchronization, interruption, and termination; performing code and character set translation and determining the display mechanism for messages.

A

Presentation Layer

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16
Q

It is the most intelligent of all layers.

A

Application Layer

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17
Q

Its responsibilities include: interface between the user and the network; providing distributed information services; controlling the sequence of activities within an application and also the sequence of events between the computer application and the user of another application; communicating directly with the user’s application program, and allowing access to network resources.

A

Application Layer

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18
Q

Is a prescribed set of well-defined rules or processes for the solution of a problem in a finite number of steps.

A

Algorithm

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19
Q

Is a group of words, variable in length that is transported as a unit.

A

Message

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20
Q

Refers to the messages to be transferred over a network

A

Traffic

21
Q

Is the smallest block of data transmitted over a network.

A

Packet

22
Q

Is a sequence of bits at the beginning of a packet, containing information about the type of packet and/or routing

A

Header

23
Q

Is the process of adding headers into the data.

A

Encapsulation

24
Q

Is the process of removing headers into the data.

A

Decapsulation

25
Q

These are used to facilitate the orderly flow of data from source to the destination.

A

Data Link Control Characters

26
Q

These involve the syntax or presentation of the data at the received terminal.

A

Graphic Control Characters

27
Q

These are used to represent the various symbols used for letter, numbers, and punctuations in the English language.

A

Alphanumeric Characters

28
Q

It is the first data communications code developed for telegraphy. It uses dots, dashes and spaces. It is not a fixed-length code, and has a unit of dot length.

A

Morse Code

29
Q

It is also known as the Telex Code developed by Thomas Murray. It was the first fixed-length character developed for machines rather than for people.

A

Baudot Code

30
Q

Its later version is recommended by the CCITT as the International Alphabet No. 2

A

Baudot Code

31
Q

It is a five (5) bit code and used primarily for low-speed teletype equipment.

A

Baudot Code

32
Q

It is the standard character set for source coding the alphanumeric character set that humans understand but computers do not (computers only understand 1s and Os).

A

ASCII Code

33
Q

ASCII stands for

A

American Standard Code for Information Interchange

34
Q

Its 1977 version is recommended by the ITU as the International Alphabet No. 5. It is a seven (7) bit fixed-length character set with 27 (128) combinations.

A

ASCII Code

35
Q

It is an 8-bit character code developed by IBM (International Business Machines Corporation) and used in IBM-compatible equipment. It has 256 codes making it the most powerful character set.

A

EBCDIC Code

36
Q

EBCDIC stands for

A

Extended Binary Coded Decimal Interchange Code

37
Q

Omnipresent black and white striped stickers that seem to appear or virtually every consumer item in most parts of the world. It is a series of vertical black bars separated by vertical white bars (known as spaces).

A

Bar codes

38
Q

One of the most popular bar codes and it uses an alphanumeric code similar to ASCII code. It contains 9 vertical elements (5 bars & 4 spaces). It consists of 36 unique codes representing the 10 digits and 26 uppercase letters.

A

Code 39

39
Q

Was developed by the grocery industry to identify their products. It is a continuous code since there are no interchangeable spaces. Each label contains a 12-digit number.

A

UPC (Universal Product Code)

40
Q

Is the trademark for a type of matrix barcode (or two-dimensional barcode). It consists of black squares arranged in a square grid on a white background, which can be read by an imaging device, and processed using Reed- Solomon error correction until the image can be appropriately interpreted.

A

QR code (Quick Response Code)

41
Q

It uses four standardized encoding modes (numeric, alphanumeric, byte/binary, and kanji).

A

QR code (Quick Response Code)

42
Q

It is also known as start-stop transmission because each character is framed between start and stop bits (the start and stop bits identify the beginning and end of the character)

A

Asynchronous Transmission

43
Q

Framing characters individually with start and stop bits is said to occur in a character-by-character basis.

A

Asynchronous Transmission

44
Q

It involves transporting serial data at high speeds in groups of characters known as blocks or frames, wherein a unique synchronizing character (SYN) is transmitted at the beginning of each message. It is faster than asynchronous transmission.

A

Synchronous Transmission

45
Q

Represent Synchronization character (SYN) in binary, hexadecimal and EBCIDIC

A

00010110 in binary, 16 in hexadecimal, and 32 in EBCDIC

46
Q

Framing characters in blocks is said to occur on a block-by-block basis.

A

Synchronous Transmission

47
Q

It is said to be a combination of asynchronous and synchronous transmission, wherein the data are checked by a common timing base and bytes are also framed with start and stop bits.

A

Isochronous Transmission

48
Q

Its operations are almost, but not quiet, in synchronization (i.e., almost synchronous but not synchronous).

A

Plesiochronous Transmission

DATA COMMS (6 decks)

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