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CTAN+1938 (Outdated, bad info) > Basics and OSI > Flashcards

Basics and OSI Flashcards

1
Q

What are layers 1-3 of the OSI model

A

Network
Data link
Physical

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2
Q

What are layers 4-7 of the OSI model

A

Application
Presentation
Session
Transport

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3
Q

Which OSI level does a hub and cabling fit into?

A

Physical

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4
Q

What level does a NIC and switch fit into?

A

Data link

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5
Q

Which OSI level has 2 sub categories and what are they?

A

Layer 2: Data Link
Link Local Control - How the nic communicates with the OS and the flow of data between them
Media Access Control - The construction and addressing of frames using a MAC address

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6
Q

How long is a MAC address in characters and bits?

A

12 chars, 48 bits

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7
Q

What are two alternate names for a MAC address?

A

MAC-48 and EUI-48 (Extended Unique identifier)

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8
Q

What parts of a frame are the “header”

A

Those with information on where the frame is going as well as the “type” (type of data in the frame)

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9
Q

What resides within the trailer of a frame?

A

The FCS/CRC

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10
Q

True or false the payload within a frame is the data?

A

Ye

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11
Q

What is a Unicast?

A

Sending data to just one system

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12
Q

What is the MAC broadcast address?

A

FF-FF-FF-FF-FF-FF

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13
Q

What is a network protocol

A

The rules and unique identifiers agreed upon by the computers in a network. Different network protocols won’t allow communication.

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14
Q

Transmission control protocol / internet protocol is an example of a…?

A

Protocol suite

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15
Q

True or false: Frames exist within packets?

A

False. Packets exist within frames.

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16
Q

Why does each router that receives your data strip away the frame and add their own?

A

To make sure the next router to receive the data is compatible with the frame type used.

17
Q

True or false: Mac deals with device to device delivery, IP deals with the final destination subnet

A

True

18
Q

What happens if a router doesn’t support a mac frame type sent to it?

A

Connection failure.

19
Q

What is layer 4 and what are three things it does.

A

Transport. Break data into chunks, add ports and seq data.

20
Q

What is a simplified TCP packet?

A

Ip to, ip from, to port, from port, seq no, ack no, data.

21
Q

What is the difference between the structure of a TCP and UDP packet.

A

TCP uses seq and ack, UDP uses length and checksum.

22
Q

What is layer 5 and what does it do?

A

Session. Manages the sessions on a computer (queuing them and arranging priority) and makes sure data is sent to the right computer.

23
Q

What is the output from netstat -a an example of from the OSI table?

A

Session

24
Q

What is layer 6 and what does it do

A

Presentation changes the incoming data into a format readable my your computer’s applications. This includes encryption.

25
Q

What does the application layer do?

A

Your applications. Browsers, etc.

26
Q

Where does (did) a hub send data?

A

To all the systems connected to the hub

27
Q

What uniquely identifies every NIC?

A

Media access control address

28
Q

What Windows utility do you use to find the MAC address for a system?

A

ipconfig /all

29
Q

A MAC address is known as a(n) __________ address.

A

physical

30
Q

A NIC sends data in discrete chunks called __________.

A

frames

31
Q

What is found at the start of a MAC frame?

A

Receiving system

32
Q

A frame ends with a special bit called the frame check sequence (FCS). What does the FCS do?

A

Verifies that the data arrived correctly

33
Q

Free slot

A

.

34
Q

Which layer of the OSI model controls the segmentation and reassembly of data?

A

Transport layer

35
Q

Which layer of the OSI model keeps track of a system’s connections to send the right response to the right computer?

A

Session layer

CTAN+1938 (Outdated, bad info) (15 decks)

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