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CCNA1 > Layers > Flashcards

Layers Flashcards

2
Q

What are the 7 layers of the OSI Model?

A

L7 ApplicationL6 PresentationL5 SessionL4 TransportL3 NetworkL2 Data LinkL1 Physical

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3
Q

Name some protocols and services that run at L7 (Application Layer)?

A

Email Protocols SMTP and Pop3TelnetHTTPFile Transfer Protocol( FTP)Simple Network Management Protocol (SNMP)

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4
Q

Name the four primary tasks that the Presentation Layer is concerned with.

A
  1. Compatibility with the operating system.2. Proper encapsulation of data for network transmission.3. Data formatting (ASCII, Binary)4. Data encryption, compression and translation
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5
Q

What is the Application Layer (L7)?

A

It’s where the end users interact with the network.

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6
Q

What is the Presentation Layer (L6)?

A

How the data is presented.

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7
Q

What are some file types in the Presentation Layer?

A

JPEG, ASCII, GIF, MPEG, MIDI, EBCDIC, and TIFF

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8
Q

What is the Session Layer (L5)?

A

It handles the creation, maintenance and teardown of communications between those two hosts.

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9
Q

What is the Transport Layer (L4)?

A

It establishes a logical end-to-end connection between two systems, segment data received from the upper layers of the OSI model, and to make sure the data gets to the destination in the correct order and free of errors.

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10
Q

What are the two methods for transporting data?

A

Connection-oriented, referring to TCP and connectionless, referring to UDP.

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11
Q

Besides TCP and UDP, what is also a Transport Layer?

A

SPX (Sequenced Packet Exchange) NCP (Novell Netware protocol.

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12
Q

The Network Layer (L3) is also called what?

A

The Routing Layer

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13
Q

What layer does IP run at?

A

The Network Layer

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14
Q

What is the two-question process in the Network Layer?

A

What valid paths exist from the local router to a given destination?What is the best path (optimal path) to take to get there?

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15
Q

What layer is the Data Link?

A

L2

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16
Q

What is a WAP?

A

Wireless Access Points

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17
Q

What runs at L2?

A

Cable Modems and DSL Modems

18
Q

What four major specifications run at L2?

A

EthernetHigh Data Link Control (HDLC)Point-to-Point Protocol (PPP)Frame Relay

19
Q

What is HDLC?

A

High Data Link Control

20
Q

What is PPP?

A

Point-to-Point Protocol

21
Q

Does the Data Link Laer perform error detection?

A

Yes

22
Q

The Data Link Layer performs error detection through the what?

A

The Frame Check Sequence

23
Q

MAC addresses are sometimes called what?

A

hardware addresses and physical addresses

24
Q

What is a burned-in address?

A

MAC address that is physically burned into the Network Interface Card (NIC)

25
Q

What does NIC stand for?

A

Network Interface Card

26
Q

What does BIA stand for?

A

a burned-in address

27
Q

Physical addresses are used in what layer?

A

Data Link Layer

28
Q

A physical address is used to deliver?

A

A frame, not a physical layer address

29
Q

Physical cable, pins, Connectors and the electrical current, run at which layer?

A

Physical Layer

30
Q

Which layers is the data simply called data?

A

Application, Presentation and Session Layers

31
Q

Which layer is data placed into segments?

A

Transport Layer

32
Q

What layer is data placed into packets?

A

Network Layer

33
Q

What layer is data placed into frames?

A

Data Link Layer

34
Q

What layer takes the form of bits?

A

Physical Layer

35
Q

Which layer is all ones and zeros?

A

Physical Layer

36
Q

Which layer adds a header and a trailer?

A

L2 Data Link Layer

37
Q

What does PDU stand for?

A

Protocol Data Unit

38
Q

What is a Protocol Data Unit?

A

A combination of data and layer-specific header.

39
Q

SPX stands for?

A

Sequenced Packet Exchange

40
Q

SNMP stands for?

A

Simple Network Management Protocol

CCNA1 (3 decks)

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