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CCNA > OSI Layers > Flashcards

OSI Layers Flashcards

1
Q

OSI layer 1

A

Physical

Transmits binary over physical media between devices

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2
Q

OSI layer 2

A

Data link

Creates and address frames for host to host delivery on LANd and between WANs

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3
Q

OSI layer 3

A

Network

Creates and addresses packets for delivery between devices

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4
Q

OSI layer 4

A

Transport

Defines data segments and numbers them at the source, transfers the data, and reassembles the data at the destination.

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5
Q

OSI layer 5

A

Session

Manages sessions between users and synchronizes web sessions, video, etc.

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6
Q

OSI layer 6

A

Presentation

Provides data format info to the application

I.e. whether it is a jpg or encrypted etc.

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7
Q

OSI layer 7

A

Application

Performs services for applications used by the user

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8
Q

Acronym for remembering the OSI layers

A

All people seem to need data processing

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9
Q

What layer uses frames?

A

Layer 2 data link

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10
Q

What layer uses packets?

A

Layer 3 network

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11
Q

TCP/IP layer 1

A

Network access(OSI 1&2)

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12
Q

TCP/IP layer 2

A

Internet (OSI 3)

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13
Q

TCP/IP layer 3

A

Transport (OSI 4)

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14
Q

TCP/IP layer 4

A

Application (OSI 5-7)

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15
Q

What is used to identify an application at the transport layer?

A

Port #

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16
Q

2 transport layer protocols

A

TCP-uses segments, connection oriented

UDP-best effort, uses data grams

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17
Q

Well known ports

A

Reserved for services and applications

0-1023

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18
Q

Registered ports

A

Assigned to user processes or applications

1024-49151

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19
Q

Dynamic or private ports

A

Assigned dynamically to client applications when initiating a connection

49152-65535

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20
Q

FTP

A

TCP

Port 20/21

21
Q

Telnet

A

TCP

Port 23

22
Q

Smtp

A

Smtp

TCP

Port 25

23
Q

TFTP

A

Trivial file transfer protocol

UDP

Port 69

24
Q

HTTP

A

Hypertext transfer protocol

TCP

Port 80

25
Q

POP3

A

Post office protocol

TCP

Port 110

26
Q

IMAP

A

Internet message access protocol

Port 143

Port 993 w/ssl

TCP

27
Q

HTTPS

A

Secure http

Port 443

28
Q

Causes of physical layer problems

A 
Power related
Hardware faults 
Cabling faults
Attenuation
Noise
Interface config errors
Exceeding design limits
CPU overload
29
Q

Symptoms of data link problems

A

No functionality of network layer or above

Poor performance

Excessive broadcasts

Console messages

30
Q

Causes of data link problems

A

Encapsulation errors
Address mapping errors
Framing errors
Stp failures or loops

31
Q

TCP/IP application layer protocols

A

DNS, telnet, SMTP, POP3, IMAP, DHCP, HTTP, FTP, SNMP

32
Q

TCP/IP transport protocols

A

TCP/IDP

33
Q

TCP/IP Internet layer protocols

A

IP, ARP, ICMP

34
Q

TCP/IP network access layer protocols

A

Ethernet, frame relay

35
Q

Application layer PDU

A

Data

36
Q

Transport layer PDU

A

Segment

37
Q

Internetwork layer PDU

A

Packet

38
Q

Network access layer PDU

A

Frame

39
Q

What layer do client/server processes reside in?

A

Application

40
Q

Primary responsibilities of transport layer

A

Tracking individual communications between applications on the source and destination hosts

Segmenting data and managing each piece

Reassembling the segments into streams of application data

Identifying different applications

Flow control between end users

Enabling error recovery

Initiating a session

41
Q

3 key functions of physical layer

A

Physical components

Encoding

Signaling

42
Q

Code group

A

A symbol that is a predefined small group of bits that represent a larger group of data bits at the physical layer

43
Q

2 Ethernet data link sub layers

A

LLC logical link control

MAC media access control

44
Q

LLC

A

Implemented on software

Adds control information to network layer packet

45
Q

MAC

A

Implemented in hardware, typically the NIC

Data encapsulation

Placement of frames on media

46
Q

MAC address

A

48 bit binary # expressed in hex

1st 3 bytes are vendor code

Last 3 bytes are unique #

47
Q

Broadcast MAC address

A

FF-FF-FF-FF-FF-FF

48 1s in binary

48
Q

ARP

A

Address resolution protocol

Uses a broadcast at layer 2 to discover the MAC address of the host when a layer 3 address is known

Maintains a cache of mapping

49
Q

Multicast MAC address

A

Always beginning with 01-00-SE

CCNA (12 decks)

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