Ccna - Osi Model Part 1

Front 1

Which layer provides network access to application?

Back 1

Application

Front 2

Which layer pinterfaces with the application

Back 2

Application

Front 3

Which layer generi-fies the data

Back 3

Presentation

Front 4

Which layer has encryption services

Back 4

Presentation

Front 5

Which layer starts and ends sessions

Back 5

Session

Front 6

Which layer logically keeps sessions seperate

Back 6

Session

Front 7

Which layer dictates how the data is sent

Back 7

Transport

Front 8

Which layer defines well known services (ports) used

Back 8

Transport

Front 9

Which layer provides logical addressing

Back 9

Network

Front 10

Which layer finds the best path to a destination

Back 10

Network

Front 11

Which layer provides physical addressing

Back 11

Data Link

Front 12

Which layer ensures data is error-free

Back 12

Data Link

Front 13

Which layer provides access to the cable

Back 13

Physical

Front 14

Which layer is the electrical signals ones and zeroes

Back 14

Physical

Front 15

Which layer resides Brouters

Back 15

Data Link and Network

Front 16

Which layer resides Bridges

Back 16

Data Link

Front 17

Which layer resides Hubs

Back 17

Physical

Front 18

Which layer resides Repeaters

Back 18

Physical

Front 19

Which layer resides Routers

Back 19

Network

Front 20

What is 802.2

Back 20

Logical Link Control (LLC)

Front 21

What is 802.3

Back 21

Media Access Control sublayer (MAC) - specifically, Ethernet

Front 22

What is 802.5

Back 22

Token Ring

Front 23

What is 802.11b

Back 23

Wireless Ethernet

Front 24

What is the port number for FTP data transfer

Back 24

Port 21

Front 25

Where the end-user (computer) begins the communications process. TELNET, FTP, EMAIL reside here. They are not program-applications themselves, but the model interface through which they communicate.

Back 25

Application

Front 26

Encryption and conversion (formating), data compression occur here. JPG, GIF, BMP.

Back 26

Presentation

Front 27

Establishes, manages, and terminates user connections. Decisions on whether to use FULL or HALF duplex are made here.

Back 27

Session

Front 28

Data transmission completion. It's responsible for flow control and error recovery between to end points in a network connection.

Back 28

Transport

Front 29

Routing and switching takes place. Logical addressing/paths are on this layer. Packet addressing, congestion control, and internetworking happen here. (IP). Routers reside here

Back 29

Network

Front 30

Broken into 2 sub-sections. LLC (Logical Link Control) controls synchronization and error detection. MAC (Media Access Control) controls packet/information reception, and where CSMA/CD gets authorization to transmit data. Switches reside here.

Back 30

Data Link

Front 31

Hardware and transmission medium reside here. Hubs and repeaters exist here

Back 31

Physical

Front 32

Enables network services

Back 32

Application

Front 33

Integrates network functionality into the host OS

Back 33

Application

Front 34

Identify conversations

Back 34

Transport

Front 35

Data Translation

Back 35

Presentation

Front 36

Connection establishment

Back 36

Session

Front 37

Managing sessions in which data is transferred

Back 37

Session

Front 38

Establishment and maintenance of communication sessions between network hosts, ensuring that data is transported.

Back 38

Session

Front 39

Management of multiple sessions - as server can maintain thousands at the same time.

Back 39

Session

Front 40

Assign session ID number to each session.

Back 40

Session

Front 41

Dialog control -- specify how network devices coordinate with each other.

Back 41

Session

Front 42

Formats or presents data into a compatible form for receipt by the Application Layer or the destination system.

Back 42

Presentation

Front 43

Formatting and translation of data between systems

Back 43

Presentation

Front 44

Negotiation of data transfer syntax between systems, via converting character sets to the correct format.

Back 44

Presentation

Front 45

Ensures host compatibility

Back 45

Presentation

Front 46

Encapsulation of data into message envelopes by encryption and compression as well as restoring same by decryption and decompression.

Back 46

Presentation

Front 47

At what layers do gateways function at?

Back 47

Transport

Front 48

What layer provides network access for applications?

Back 48

Application

Front 49

What layer provides flow control?

Back 49

Transport

Front 50

What layer establishes the availability of other computers on the network?

Back 50

Application

Front 51

What layer determines if sufficient resources exist for communication to occur between two computers?

Back 51

Application

Front 52

What layer does SMTP function at?

Back 52

Application

Front 53

What layer does FTP function at?

Back 53

Application

Front 54

What layer does SNMP function at?

Back 54

Application

Front 55

What layer does Telnet function at?

Back 55

Application

Front 56

What layer performs protocol conversion?

Back 56

Presentation

Front 57

What layer performs encryption?

Back 57

Presentation

Front 58

What layer performs compression?

Back 58

Presentation

Front 59

What layer synchronizes computers involved in a communication?

Back 59

Session

Front 60

What layer handles connection establishment, data transfer, and connection release?

Back 60

Session

Front 61

What layer does NetBIOS function at?

Back 61

Session

Front 62

What layer repackages messages into smaller formats?

Back 62

Transport

Front 63

What layer provides error-free delivery and error handling functions?

Back 63

Transport

Front 64

What layers does NetBEUI function at?

Back 64

Transport and Network

Front 65

What layer does TCP function at?

Back 65

Transport

Front 66

What layer does SPX function at?

Back 66

Transport

Front 67

What layers does NWLink function at?

Back 67

Transport and Network

Front 68

What layer handles logical addressing?

Back 68

Network

Front 69

What layer handles routing?

Back 69

Network

Front 70

What layer handles traffic management?

Back 70

Network

Front 71

What layer does IP function at?

Back 71

Network

Front 72

What layer does IPX function at?

Back 72

Network

Front 73

Where does the routers and brouters function at

Back 73

Network

Front 74

What layer packages raw bits into frames?

Back 74

Data Link

Front 75

What is the purpose of packaging raw bits into frames?

Back 75

they are transmittable across a network

Front 76

What layer includes a Cyclical Redundancy Check (CRC)?

Back 76

Data Link

Front 77

What are the two sublayers of the Data Link layer?

Back 77

LLC and MAC

Front 78

What does the LLC sublayer use to create links for the MAC sublayer?

Back 78

Destination Service Access Points and Source Service Access Points A80

Front 79

Which layer does switches, bridges, and brouters function

Back 79

Data Link

Front 80

Which layer does multiplexers and repeaters (Hubs) resides

Back 80

Physical

Front 81

How many bits/bytes are in MAC address

Back 81

48 bits / 6 bytes

Front 82

What protocol is used to map MAC addresses to IP addresses?

Back 82

ARP

Front 83

What is the 5-step encapsulation process?

Back 83

1. Create application data and headers 2. Package data for transport 3. Add destination and source network address 4. Add destination and source data link address 5. Transmit the bits

Front 84

What are the 7 layers of the OSI reference model?

Back 84

7. Application 6. Presentation 5. Session 4. Transport 3. Network 2. Data Link 1. Physical

Front 85

What are the 4 layers of the TCP/IP reference model?

Back 85

4. Application 3. Transport 2. Internetwork 1. Network Interface

Front 86

What is a L3PDU?

Back 86

L3PDU stands for layer 3 protocol data unit, which would be the layer 3 headers, trailers, and all data encapsulated inside

Front 87

What terms describe the contents of data encapsulated by the data link layer

Back 87

Frame

Front 88

What terms describe the contents of data encapsulated by the network layer

Back 88

Packet

Front 89

What terms describe the contents of data encapsulated by the transport layer

Back 89

Segment

Front 90

What are the benefits of layering?

Back 90

1. Easier to learn 2. Easier to develop 3. Multivendor Interoperability 4. Modular Engineering

Front 91

What header or trailer does a router discard as a side-effect of routing?

Back 91

The data-link header and trailer

Front 92

Which layer provides network access to application?

Back 92

Application

Front 93

Which layer pinterfaces with the application

Back 93

Application

Front 94

Which layer generi-fies the data

Back 94

Presentation

Front 95

Which layer has encryption services

Back 95

Presentation

Front 96

Which layer starts and ends sessions

Back 96

Session

Front 97

Which layer logically keeps sessions seperate

Back 97

Session

Front 98

Which layer dictates how the data is sent

Back 98

Transport

Front 99

Which layer defines well known services (ports) used

Back 99

Transport

Front 100

Which layer provides logical addressing

Back 100

Network

Front 101

Which layer finds the best path to a destination

Back 101

Network

Front 102

Which layer provides physical addressing

Back 102

Data Link

Front 103

Which layer ensures data is error-free

Back 103

Data Link

Front 104

Which layer provides access to the cable

Back 104

Physical

Front 105

Which layer is the electrical signals ones and zeroes

Back 105

Physical

Front 106

Which layer resides Brouters

Back 106

Data Link and Network

Front 107

Which layer resides Bridges

Back 107

Data Link

Front 108

Which layer resides Hubs

Back 108

Physical

Front 109

Which layer resides Repeaters

Back 109

Physical

Front 110

Which layer resides Routers

Back 110

Network

Front 111

What is 802.2

Back 111

Logical Link Control (LLC)

Front 112

What is 802.3

Back 112

Media Access Control sublayer (MAC) - specifically, Ethernet

Front 113

What is 802.5

Back 113

Token Ring

Front 114

What is 802.11b

Back 114

Wireless Ethernet

Front 115

What is the port number for FTP data transfer

Back 115

Port 21

Front 116

Where the end-user (computer) begins the communications process. TELNET, FTP, EMAIL reside here. They are not program-applications themselves, but the model interface through which they communicate.

Back 116

Application

Front 117

Encryption and conversion (formating), data compression occur here. JPG, GIF, BMP.

Back 117

Presentation

Front 118

Establishes, manages, and terminates user connections. Decisions on whether to use FULL or HALF duplex are made here.

Back 118

Session

Front 119

Data transmission completion. It's responsible for flow control and error recovery between to end points in a network connection.

Back 119

Transport

Front 120

Routing and switching takes place. Logical addressing/paths are on this layer. Packet addressing, congestion control, and internetworking happen here. (IP). Routers reside here

Back 120

Network

Front 121

Broken into 2 sub-sections. LLC (Logical Link Control) controls synchronization and error detection. MAC (Media Access Control) controls packet/information reception, and where CSMA/CD gets authorization to transmit data. Switches reside here.

Back 121

Data Link

Front 122

Hardware and transmission medium reside here. Hubs and repeaters exist here

Back 122

Physical

Front 123

Enables network services

Back 123

Application

Front 124

Integrates network functionality into the host OS

Back 124

Application

Front 125

Identify conversations

Back 125

Transport

Front 126

Data Translation

Back 126

Presentation

Front 127

Connection establishment

Back 127

Session

Front 128

Managing sessions in which data is transferred

Back 128

Session

Front 129

Establishment and maintenance of communication sessions between network hosts, ensuring that data is transported.

Back 129

Session

Front 130

Management of multiple sessions - as server can maintain thousands at the same time.

Back 130

Session

Front 131

Assign session ID number to each session.

Back 131

Session

Front 132

Dialog control -- specify how network devices coordinate with each other.

Back 132

Session

Front 133

Formats or presents data into a compatible form for receipt by the Application Layer or the destination system.

Back 133

Presentation

Front 134

Formatting and translation of data between systems

Back 134

Presentation

Front 135

Negotiation of data transfer syntax between systems, via converting character sets to the correct format.

Back 135

Presentation

Front 136

Ensures host compatibility

Back 136

Presentation

Front 137

Encapsulation of data into message envelopes by encryption and compression as well as restoring same by decryption and decompression.

Back 137

Presentation

Front 138

At what layers do gateways function at?

Back 138

Transport

Front 139

What layer provides network access for applications?

Back 139

Application

Front 140

What layer provides flow control?

Back 140

Application

Front 141

What layer establishes the availability of other computers on the network?

Back 141

Application