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CompTia Network+ N10-007 > Lesson 1 Explaining the OSI and TCP/IP Models > Flashcards

Lesson 1 Explaining the OSI and TCP/IP Models Flashcards

In this lesson, you will: • Describe the functions of the layers of the OSI model. • Describe the functions of the layers of the TCP/IP model.

1
Q

What Are The 7 Layers of OSI Model ?

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

OSI Stands For What?

A

Open System Interconnection

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3
Q

TCP/IP Top Layer Is Called Application & Is Combined of What 3 OSI Model Layers?

A

Layer 5 Session Layer,
Layer 6 Presentation,
& Layer 7 Application Layer

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4
Q

TCP/IP Host-To-Host Transport Layer Is the Same as Which OSI Layer?

A

Layer 4 Transport Layer

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5
Q

TCP/IP Internet Layer Is the Same as Which OSI Layer?

A

Layer 3 Network Layer

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6
Q

TCP/IP Network Interface Layer is a combination of Which Two OSI Layers?

A

Layer 2 Data-Link Layer & Layer 1 Physical Layer

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7
Q

What Is a Network Boundary?

A

Two or more computer systems linked together by some form of transmission medium that enables them to share information

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8
Q

What Are Nodes?

A

Nodes are the devices that communicate on the network

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9
Q

What Are Links?

A

Links are the communications pathways that are found between Nodes

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10
Q

PDU Stands for What?

A

Protocol Data Units

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11
Q

What are Two of The Most important functions of Protocols?

A

Addressing and Encapsulation

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12
Q

What Function Direct Data to what path it will take?

A

Addressing

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13
Q

Which Devices Can Be Found at Layer 1 Physical Layer?

A

Transceiver, Media Converter, Hub/Repeaters & Modem

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14
Q

MAC Addresses & Switches are found at which Layer?

A

Layer 2 Data-Link Layer

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15
Q

Which device is used to amplifies an electronic signal so as to extend the maximum allowable distance for a media?

A

A Repeater

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16
Q

Bits Encoding/ Transmission takes place at which Layer?

A

Layer 1 Physical Layer

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17
Q

Switches found at Layer 2 the Data Link Layer forward frames from one port to another port based off what?

A

The Mac Address plugged into the switch port

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18
Q

Routers found in the 3rd layer Network Layer sends what to other routers by moving data between networks?

A

Packets

19
Q

A NIC, Bridge, Switches & Wireless Access Point (WAP) are devices found at which Layer?

A

Layer 2 Data-Link Layer

20
Q

IP Address, ICMP, IGMP, ARP, IPsec describe devices found at which layer?

A

Layer 3 Network Layer

21
Q

A method of grouping data into packets that are transmitted over a digital network

A

Packet Switching

22
Q

A method of implementing a telecommunications network in which two network nodes establish a dedicated communications channel through the network before the nodes may communicate.

A

Circuit Switching

23
Q

A form of switching in which data is broken into packets but with the add ability of being stored or forwarded (i.e., like email) goes by what name?

A

Message switching

24
Q

OSPF is short for?

A

Open Shortest Path First

25
Q

Router Information Protocol Is also called what?

A

RIP

26
Q

A request to find the best available route to the destination, when sending a message.

A

Route Discovery

27
Q

Flow Control prevents what from occurring?

A

It prevents a sender from sending data faster than the receiver can get it

28
Q

Allowing packets to be sent over more than one link & routes for faster service is named what?

A

Packet Reordering

29
Q

Layer 4 is named what?

A

Transport Layer

30
Q

UDP (User Datagram Protocol) is connectionless protocol that defined by RFC 768
that is used for?

A

Used for performance but can be unreliable

31
Q

The Network Layer identify each application by assigning what to it?

A

It identifies applications by assigning port numbers to them

32
Q

TCP (Transmission Control Protocol) ensures reliable data delivery through a process that is named?

A

Three-Way Handshake in which normally a client device would initiate a connection with a server. The client sends a sequence number packet (with the SYN bit set) to the server. The packet contains the random sequence number (e.g., 5432) which marks the beginning of the sequence numbers for data that the server will transmit.

33
Q

The Layer that represents the dialog control functions that administer the process of establishing the dialog, managing data transfer, and then ending (or tearing down) would be which layer?

A

Layer 5 The Session Layer

34
Q

What is happening at the Session Layer?

A

The management of a session between two devices and also firewalls protections

35
Q

One-way/simplex—Only one system is allowed to send messages; the other only receives.
Two-way alternate (TWA)/half-duplex—The hosts establish some system for taking turns to send messages, such as exchanging a token.
Two-way simultaneous (TWS)/duplex—Either host can send messages at any time.
Are the 3 modes of which layer?

A

Layer 5 The Session Layer

36
Q

Compression, Encryption and Formatting all take place during which layer in the OSI process?

A

Layer 6 The Presentation layer

37
Q

The Presentation Layer does what?

A

Transforms data between the format required for the network and the format required for the application

38
Q

What is the main purpose of layer 7 (Application Layer) within the OSI Model?

A

To provide an interface for software programs on network hosts that have established a communications channel through the lower-level protocols to exchange data.

39
Q

Network card driver (Layer 2), Sockets/Winsock (Layer 5) & Web Browsing (Layer 7) are all examples of what?

A

They are examples of API’s (Application Programming Interface) software.

40
Q

A dedicated path established between two locations, such as two routers or two modems.

A

A Circuit

41
Q

The ability for one host to forward information to another using any available path

A

Packet Switching

42
Q

A packet switching protocol is described as ?

A

Robust because it can automatically recover from communications link failures. It re-routes data packets around an internetwork of available paths. If transmission lines are damaged or if a router fails to respond, it can use any available network path that remains.

43
Q

The process for adopting Internet standards revolves around the production of documents called ?

A

Requests for Comments (RFCs)

CompTia Network+ N10-007 (16 decks)

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