Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

networking + > osi model > Flashcards

osi model Flashcards

1
Q

what layer do frames get fragmented

A

layer 3 network layer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

what does layer 3 work with

A

ip address, routers, packets

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is OSI Model short for?

A

Open Systems Interconnect Model

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What are the 7 OSI model layers?

A

Application
Presentation
Session
Transport
Network
Data Link
Physical

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What are the upper layers?

A

Application
Presentation
Session

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What are the lower layers?

A

Transport
Network
Data Link
Physical

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What does the OSI Application layer do?

A

Provides network services to the end host’s applications
makers sure applications can communicate with other applications on different networks

eg - Email, FTP, Telnet

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What does the OSI Presentation layer do?

A

Ensures that data can be understood between two end hosts
reformatting, compressing, encrypting

eg - ASCII character encoding

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What does the OSI Session layer do?

A

Manages sessions between end hosts
control and tunneling protocols happen here
eg - Web server tracking its open connects to web browser clients

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What does the OSI Transport layer do?

A

1) Breaks up data between sender and receiver into smaller parts
2) Establishes end to end connectivity
3) Can ensure reliable delivery (ie - error detection and retransmission)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is segmentation?

A

The process used by Layer 4 (Transport layer) to break data between sender and receiver into smaller parts

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Name two layer 4 protocols

A

TCP (Transmission Control Protocol)
UDP (User Datagram Protocol)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What OSI layer do TCP and UDP work at?

A

Layer 4 (Transport)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What does the OSI Network layer do?

A
  • Provides connectivity and path selection (eg - routing)
  • Defines logical addressing (eg - IPv4 and IPv6 addresses)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What layer do IPv4 and IPv6 work at?

A

Layer 3 - Network layer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What does the OSI Data Link layer do

A

Defines data format for transmission (eg - Ethernet, Frame Relay, PPP)
- Controls access to physical media (eg - Ethernet CSMA/CD)
- Defines physical addressing (eg - ethernet MAC address)
- Typically has error detection (eg - Cyclical Redundancy Check (CRC))

17
Q

What are Data Link layer protocols

A

Ethernet
PPP(Point-to-Point Protocol)

18
Q

What does the OSI Physical layer do?

A

sends bits over a wired or wireless connection
- Defines physical media properties
* Electrical Functions
* Physical data rates
* Physical connectors
* Cable distances
* Optical wavelengths
* Wireless frequencies

19
Q

What layer do Repeaters and Hubs work at?

A

Layer 1 - Physical

20
Q

Why use layers?

A
  • Devices need to be aware only of their own layer
  • Allows interoperability between devices and vendors
21
Q

What is encapsulation

A

adding a header to the data from the layer above

22
Q

Name the process where data is removed when adjacent layers talk

A

Decapsulation

23
Q

What is a PDU?

A

A Protocol Data Unit - it is the resulting data that a layer creates

24
Q

What happens during decapsulation?

A

The process removes data formatting on the receiving host to expose a PDU

25
Q

What is a PDU at the Transport layer called?

A

A Segment for tcp and a datagram for udp

26
Q

What is a packet?

A

A PDU at layer 3 (Network layer)

27
Q

What is a frame?

A

A PDU at layer 2 (Data Link layer)

28
Q

What is a PDU at layer 1 called?

A

A Bit

29
Q

What direction does encapsulation occur?

A

From layer 7 to layer 1

30
Q

What is an encapsulation header?

A

New data added to the front by a layer during encapsulation

31
Q

What is an encapsulation trailer?

A

New data added to the end by a layer during encapsulation

32
Q

Describe the decapsulation process

A

Data moves up the stack (layer 1 -> 7)
- Each layer removes its own header/trailer
- Data is passed to the layer above
- Process repeats until data reaches the application layer

networking + (47 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions