CPE 041 DATACOM P3

Question 1

Computer communication

Answer 1

Data Communications

Question 2

Protocol

Answer 2

Sysntax
Semantics
Timing

Question 3

Standards

Answer 3

De Facto
De Jure

Question 4

Market Driven Standards

Answer 4

De Facto

Question 5

Legislated by organized body

Answer 5

De Jure

Question 6

Standards Organization

Answer 6

IEEE
ITU-T
TIA
EIA
ANSI

Question 7

IEEE Standard Organization

Answer 7

8021 Bridging and Management
80.2.2 logic Link Control
802.3. Ethernet-CSMA/CD Access Method
802. 4 Token Passing Bus Access Method
802.5 Token Ring Access Method
802.6 Distributed Queue Dual Bus Access Method
802.7 Broadband LAN
802.8 Fiber Optic
802.9 Integrated Services LAN
802.10 Security
802.11 Wireless LAN
802 12 Demand Priority Access POZ. 14 Medium Access Control 802.15 Wireless Personal Area Network
802.16 Broadband Wireless Metro Area Network
802.17 Resilient Packet Ring

Question 8

Network Criteria

Answer 8

Performance
Reliability
Security

Question 9

Four Fundamentals Characteristics of Data Communications

Answer 9

Delivery
Accuracy
Timeless
Jitter

Question 10

Transmission Mode

Answer 10

Simplex
Half-Duplex
Full-Duplex

Question 11

one direction

Answer 11

Simplex

Question 12

both direction but not same time

Answer 12

Half-Duplex

Question 13

both direction at the same time

Answer 13

Full-Duplex

Question 14

acts as the source of destination

Answer 14

Data Terminal Equipment

Question 15

used to establish, maintain, and terminate communication network
sessions between a data source and it’s destination

Answer 15

Data Communications Equipment

Question 16

a device used to convert serial digital data from a transmitting terminal to a signal suitable for transmission over a telephone channel, or to reconvert the transmitted signal to a serial digital data for acceptance at the receiving terminal

Answer 16

Modem (modulator-demodulator)

Question 17

Advantages of Modems

Answer 17

-easier to multiplex
-easier to integrate in to a switching system
-easy to interface with other digital equipment
-noise immunity
-better performance monitorability
-easy to encode, decode, encrypt, and scramble

Question 18

Disadvantages of Modems

Answer 18

-large bandwidth
-need for synchronization
-need for additional equipment
- not compatible with existing system
-need for AD/DA conversion
-restriction in wired topology

Question 19

concerns with the physical configuration of the devices and the cable that it connects. It is the architecture or physical layout of the network

Answer 19

Data Network Topology

Question 20

consists of nodes string together in series with each node connected to a long cable or bus; many nodes can tap into the bus and begin communication with all other nodes on that cable segment

Answer 20

Bus Topology

Question 21

-bucket or token passing
-signals are transmitted in a rotating fashion
-tokens give stations the “right to transmit” messages

Answer 21

Ring Topology

Question 22

-how the nodes are connected

Answer 22

Physical Topology

Question 23

-how data is transmitted

Answer 23

Logical Topology

Question 24

-features a central controller to which all nodes are connected

Answer 24

Star Topology

Question 25

-variation of star topology, it contains multiple bus

Answer 25

Tree Topology

Question 26

- the devices are connected redundantly with each other

Answer 26

Mesh Topology

Question 27

formula to know how many cables should be use

Answer 27

C=(N(N-1))/2

Question 28

Network Breadth

Answer 28

Local Area Networks (LAN) Metropolitan Area Networks (MAN) Wide Area Networks (WAN) Global Area Networks (GAN)

Question 29

collection of independent computers which can communicate with one another over a shared medium, usually conf to a small geographical area, such as a single building or a college campus

Answer 29

Local Area Network (LAN)

Question 30

PAN SAN VPN EPN

Answer 30

PAN - Personal Area Network SAN - Storage Area Network VPN- Virtual Private Network EPN - Enterprise Private Network

Question 31

-consists of a computer networks across an entire city, college campus or small region

Answer 31

Metropolitan Area Network (MAN)

Question 32

-occupies a very large area, such as an entire country or the entire world

Answer 32

Wide Area Network

Question 33

a global computer network that connects thousands of networks together allowing them to exchange files, send messages, download, graphics and text, and share other resources

Answer 33

Internet

Question 33

-categories and identifiers the pointer or number of location

Answer 33

Network Configuration

Question 34

-provides a dedicated link between two devices

Answer 34

Point-to-Point

Question 35

-more that two specific devices share a single link

Answer 35

Multipoint

Question 36

Data Transmission

Answer 36

Serial Parallel

Question 37

-sends only one bit at a time

Answer 37

Serial

Question 38

-chunk of data is sent at the same time

Answer 38

Parallel

Question 39

Serial Transmission

Answer 39

Synchronous Asynchronous

Question 40

- eliminates the need for start and stop bits

Answer 40

Synchronous

Question 41

-one character is transmitted at a time -transmission is controlled by start and stop bits at the beginning and end of each character

Answer 41

Asynchronous

Question 42

In serial transmission ______is faster than ___________

Answer 42

Synchronous Asynchronous

Question 43

-transmission in which data are sent at a fixed rate, with the receiver and transmitter synchronized -synchronized transmission eliminates the need for start and stop bits

Answer 43

Synchronous

Question 44

is the transmission of information from one or more source to one more destination over the same transmission medium

Answer 44

Multiplexing

Question 45

splits the available bandwidth for a given communication link into a number of chanels

Answer 45

Frequency Division Multiplexing

Question 46

splits up the capacity of the line by assigning each user a particular timeslot

Answer 46

Time Division Multiplexing

Question 47

Different kind of Multiplexing

Answer 47

Frequency Division Multiplexing Time Division Multiplexing Synchronous / Statical TDM Asynchronous / Statical TDM Frequency Hopping Spread Spectrum Direct Sequence Spread Spectrum

Question 48

Seven OSI Layer

Answer 48

Physical Layer Data Link Layer Network Layer Transport Layer Session Layer Presentation Layer Application Layer

Question 49

File Transfer :File Transfer Protocol (FTP) Email: Simple Mail Transfer Protocol (SMTP) Web Browsing: Herpertext Transfer Protocol (HTTP)

Answer 49

Application Layer

Question 50

Data Encryption/Decryption Data Compression -lossing -lossless

Answer 50

Presentation Layer

Question 51

Authentication -username -password Authorization

Answer 51

Session Layer

Question 52

Transmission Control Protocol (TCP) *connection oriented services -request -acknowledge -send data User Datagram Protocol *connection services -send data -send data -send data

Answer 52

Transport Layer

Question 53

routing, networking, logical / IP addressing

Answer 53

Network Layer

Question 54

-error-free data transfer

Answer 54

Data Link Layer

Question 55

-composed of 6-two digit hexadecimal number

Answer 55

Media Access Control (Mac)

Question 56

responsible for physical connections

Answer 56

Physical layer

Question 57

A P S T N D P

Answer 57

Application Layer Presentation Layer Session Layer Transport Layer Network Layer Physical Layer