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CompTIA Network Plus > OSI and TCP/IP > Flashcards

OSI and TCP/IP Flashcards

1
Q

How many and what are the layers of the OSI model?

A 
7 Layers: 
7-Application
6-Presentation
5-Session
4-Transport
3-Network
2-Data Link
1-Physical
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2
Q

What does OSI in OSI model stand for?

A

Open Systems Interconnection model

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3
Q

How many and what are the layers of the TCP/IP model?

A 
4 Layers: 
4-Application Layer
3-Transport Layer
2-Internet Layer
1-Network Interface Layer/ AKA Link Layer
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4
Q

What Does ISO stand for?

A

International Organization for Standardization

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5
Q

The ____ layer is responsible for error free transfer of data frames. This layer provides synchronization for the physical layer.

A

data-link

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6
Q

This layer also contains two sub layers, what are they?

A

Data Link Layer:
MAC sub-layer
LLC sub-layer

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7
Q

What does LLC stand for in the data link sub layer?

A

Logical Link Control

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8
Q

What does MAC stand for in the data link sub layer?

A

Media Access Control

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9
Q

The ____ layer is responsible for packaging and transmitting data on the physical media.

A

physical

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10
Q

The____ layer conveys the bit stream through a network at the electrical and mechanical level.This includes the layout of pins, voltages, cable specifications, hubs, repeaters, network adapters, host bus adapters

A

physical

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11
Q

The____ layer controls the operation of the subnet. It determines the physical path that data takes on the basis of network conditions, priority of service, and other factors.

A

network

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12
Q

The____ layer is responsible for routing and forwarding data packets.

A

network

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13
Q

The____ layer ensures that messages are delivered in the order in which they are sent and that there is no loss or duplication. It ensures complete data transfer.

A

transport

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14
Q

The____ layer establishes communication between processes running on different communication entities in a network and can support a message-mode data transfer. It deals with connection an coordination.

A

session

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15
Q

The____ layer serves as the data translator for a network. It’s usually a part of an operating system and converts incoming and outgoing data from one viewable format to another. This layer is also known as the syntax layer.

A

presentation

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16
Q

The____ layer serves as a window for users and program processes to access network services. It handles issues, such as network transparency, resource allocation, etc.

A

application

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17
Q

The ____ layer is responsible for putting frames on the wire and pulling frames off the wire. It is equivalent to the data-link and physical layers of the OSI model. This layer is also known as Link layer.

A

Network Access

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18
Q

The____ layer provides three services - a connectionless delivery service, a mechanism to break data into individual packets or frames on the transmitting side and put them back together on the receiving side, and the routing functions necessary to interoperate with other networks. It is equivalent to the network layer of the OSI model.

A

Internet

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19
Q

The____ layer provides communication sessions between connected computers. This layer is responsible for error detection and correction. It is also known as host-to-host or transmission layer and is equivalent to the transport layer of the OSI model

A

transport

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20
Q

The ____ layer serves as a window for users and application processes to access network services. Several standard TCP/IP utilities and services exist at the application layer. It is equivalent to the application, presentation, and session layers of the OSI model

A

application

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21
Q

Which two layers of the OSI model is the Network Access (or Link) layer equivalent to?

A

Data Link Layer

Physical Layer

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22
Q

Which three layers of the OSI model is the Application Layer of the TCP/IP layer equivalent to?

A

Application Layer
Presentation Layer
Session Layer

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23
Q

At which OSI layer(s) does hypertext transfer protocol (HTTP) function?

A

Application
Presentation
Session

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24
Q

At which OSI layer(s) does file transfer protocol (FTP) function?

A

Application
Presentation
Session

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25
Q

At which OSI layer(s) does Telnet function?

A

Application
Presentation
Session

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26
Q

At which OSI layer(s) does simple mail transfer protocol (SMTP) function?

A

Application
Presentation
Session

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27
Q

At which OSI layer(s) does post office protocol 3 (POP3) mail function?

A

Application
Presentation
Session

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28
Q

At which OSI layer does transmission control protocol (TCP) function?

A

Transport

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29
Q

At which OSI layer does user datagram protocol (UDP) function?

A

Transport

30
Q

At which OSI layer does routing information protocol (RIP) function?

A

Network

31
Q

At which OSI layer does open shortest path first (OSPF) function?

A

Network

32
Q

At which OSI layer does Internet Group Management Protocol (IGMP) function?

A

Network

33
Q

At which OSI layer does Internet Control Message Protocol (ICMP) function?

A

Network

34
Q

At which OSI layer does address resolution protocol (ARP) function?

A

Data Link

Physical

35
Q

At which OSI layer does ethernet function?

A

Data Link

Physical

36
Q

At which OSI layer does Token Ring function?

A

Data Link

Physical

37
Q

At which OSI layer doesWireless LAN function?

A

Data Link

Physical

38
Q

Defines the physical and electrical characteristics of the network. The NIC cards in your PC and the interfaces on your routers all run at this layer since they have to pass strings of ones and zeros down the wire.

A

Layer 1- Physical

39
Q

Defines the access strategy for sharing the physical medium, including media access issues. Protocols such as point to point (PPP), Serial Line Internet Protocol (SLIP), and High-Level Data Link Control (HDLC) work at this layer.

A

Layer 2- Data Link

40
Q

Provides a means for communicating open systems to establish, maintain, and terminate network connections. The IP protocol lives at this layer, and so do some routing protocols. All the routers in your network are operating at this layer.

A

Layer 3- Network

41
Q

Relieves the Session Layer (Layer 5) of the burden of ensuring data reliability and integrity. The more powerful routing protocols also operate here. OSPF and BGP, for example, are implemented as protocols directly over IP.

A

Layer4- Transport

42
Q

This layer provides for two communicating presentation entities to exchange data with each other.

A

Layer 5- Session

43
Q

Layer where application data is packed or unpacked, ready for use by the running application. Protocol conversions, encryption/decryption, and graphics expansion all take place here.

A

Layer 6- Presentation

44
Q

Layer where you find your end-user and end-application protocols, such as telnet, ftp, and mail (pop3 and smtp).

A

Layer 7- Application

45
Q

A unique value expressed as six pairs of hexadecimal numbers, often separated by hyphens or colons.

A

Media Access Control Address (MAC Address)

46
Q

MAC addresses are used in the Media Access Control protocol sub-layer ____ layer

A

Data-Link

47
Q

If a host doesn’t know the MAC address of another host on a local area network, it uses the operating system to discover the MAC address. Computers on different networks, however, can’t use their MAC addresses to enable communication because the hardware protocol (for example, Ethernet) controls traffic only on its own network. For the host to communicate with a host on another LAN across the corporate intranet or Internet, it must know the ____ of the host.

A

IP address

48
Q

____function at the network layer of the OSI model. The network layer moves data from one end point to another by implementing the following functions:

A

IP address

49
Q

A ____ is most commonly used to refer to Ethernet, Token Ring, or Frame Relay units of data.

A

frame

50
Q

It is called a _____ because it is created by taking higher-level packets or datagrams and ____ them with additional header information needed at the lower level. It works on layer 2 (Data-link layer) of the OSI model.

A

frame

51
Q

At the physical layer, binary expressions represent data. A binary expression is made up of bits, where a bit is a single 1 or a single 0. At upper layers, however, bits are grouped together, into what is known as a protocol data unit (PDU) or a data service unit. The term____ is used fairly generically to refer to these PDUs. However, PDUs might have an additional name, depending on their OSI layer.

A

packet

52
Q

Protocol data unit(s) found at the physical layer.

A

Bits

53
Q

Protocol data unit(s) found at the Data Link layer.

A

Frames

Packets

54
Q

Protocol data unit(s) found at the Network layer.

A

Packets

Datagrams

55
Q

Protocol data unit(s) found at the Transport Layer.

A

Segments

Packets

56
Q

What are the 4 PDUs found in the first four layers of the OSI model?

A 
Segment
Packets
Frames
Bits
(Mnemonic- Some People Fear Birthdays)
57
Q

A network adapter, also referred to as a network board or____, provides a communication channel between your computer’s motherboard and the network. The function of a ____ is to send and receive information from the system bus in parallel and to send and receive information from the network in series. The ____ also converts the data that it receives from the system into a signal that’s appropriate to the network.

A

Network Interface Card (NIC)

58
Q

Used to connect devices for networking in a wired network.

A

Ethernet cables

59
Q

A ___ is used in a wired network to connect Ethernet cables from a number of devices together. ___ are standard network devices that function at the layer 1 (Physical layer) of OSI model. The device is a form of multiport repeater.

A

Hub

60
Q

A ___ is an internetworking device that connects two different LANs and makes them appear to be one, or segments a larger LAN into two smaller pieces. ___ are more intelligent than repeaters. ___ can read the specific physical address of devices on one network and filter information before passing it on to another network segment. This keeps local traffic of one segment from going beyond the segment, as well as prevents traffic addressed to one network segment from being sent out to all segments.

A

Bridge

61
Q

A____ is a network device that selects a path or circuit for sending a data unit to its next destination. ____ operate at the Data Link layer of the OSI model. The function of ___ is to select the best possible path.

A

switch (also known as layer 2 switch)

62
Q

____ is generally a more modern term for multiport bridge. Like bridges, switches operate at the data link layer of the OSI model. However, although their basic functionality is the same, switches implement additional advanced filtering techniques to optimize performance.

A

The term Layer 2 switch (also known as a data switch or simply switch)

63
Q

In a ____, computers that are connected to separate segments appear and behave as if they’re on the same segment.

A

VLAN

64
Q

____are fundamentally different from bridges because they operate at the network layer. This means that a ___ opens the MAC (Media Access Control) layer envelope and looks at the contents of the packet delivered at the MAC layer. The contents of the MAC layer envelope are used to make routing decisions. This also means that protocols must have network layer addressing to be routable.

A

Routers

65
Q

A ____ is an internetworking device that operates at OSI Layer 2 like a basic switch, but provides additional functions at higher OSI layers. ___ combine Layer 2 data switching with Layer 3 routing using an application-specific integrated circuit (ASIC). (An application-specific integrated circuit is one that has been customized for a specific purpose.) This allows data packets to be directed to their destinations at a higher speed (referred to as wirespeed) than with normal routing.

A

multilayer switch (MLS)

66
Q

Which layer does the following apply:

System management and network access for applications; E-mail, FTP, Telnet

A

Application

67
Q

Which layer does the following apply:

Formatting; Encryption

A

Presentation

68
Q

Which layer does the following apply:
Traffic control;
NetBIOS, named pipes, sockets, remote procedure calls (RPCs)

A

Session

69
Q

Which layer does the following apply:
Management and control;
TCP

A

Transport

70
Q

Which layer does the following apply:
Addressing;
IP addresses, packets, routers, multilayer switches

A

Network

71
Q

Which layer does the following apply:

Access; MAC addresses, NICs, frames, switches, multilayer switches, bridges, EUI-64 identifiers

A

Data Link

72
Q

Which layer does the following apply:
Cables and connectors;
Hubs, copper wire, fiber, NIC connectors, wireless radio waves

A

Physical

CompTIA Network Plus (2 decks)

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