Open Systems Interconnection Flashcards
Layer 1
Physical
Layer 2
Data Link
Layer 3
Network
Layer 4
Transport
Layer 5
Session
Layer 6
Presentation
Layer 7
Application
MPLS
Multi Protocol Label Switching
What layer do simplex, half duplex and full duplex belong in?
Session Layer / Layer 5
TCP
Transmission Control Protocol
UDP
User Datagram Protocol
TCP\IP
Transmission Control Protocol \ Internet Protocol
A connection oriented session consists of what order of events?
SYN, SYN\ACK, ACK
Flow control belongs to what layer?
Transport Layer \ Layer 4
LLC
Logical Link Control
MAC
Media Access Control
IEEE
Institute of Electrical and Electronics Engineers
Standard 802.3
Covers Ethernet Networks
Standard 802.11
Covers Wireless Networks
PDU
Protocol Data Unit
DTE
Data Terminal Equipment
DCE
Data Communication Equipment
CSU\DSU
Channel Service Unit \ Data Service Unit
What is wrapping data with protocol information at each layer of the OSI model?
Encapsulation
MODEM
Modulator Demodulator
FDM
Frequency Division Multiplexing
TDM
Time Division Multiplexing
Examples of Layer 1 \Physical Devices are:
Hubs & Repeaters
Examples of Layer 2 \ Data Link Devices are:
Switches & Bridges
Examples of Layer 3 \ Network Devices are:
Routers
Framing occurs at what layer?
Data Link \ Layer 2
Physical topology occurs at what layer?
Physical \ Layer 1
Routing occurs at what layer?
Network \ Layer 3
End-To-End communication occurs at what layer?
Transport \ Layer 4
Dialog Control occurs at what layer?
Session \ Layer 5
Data encryption, compression and translation services occurs at what layer?
Presentation \ Layer 6
File, print, message, database and application services occurs at what layer?
Application \ Layer 7
What is a 3 way handshake?
SYN, SYN\ACK, ACK
TCP & UDP reside at which layer of the OSI model?
Layer 4 \ Transport
What layer of the OSI model provides an entry point for programs to access the network infrastructure?
Application \ Layer 7
What layer could be the source of a “time-out” message?
Application \ Layer 7
Which layer of the OSI model is responsible for code and character-set conversion?
Presentation \ Layer 6
Which layer of the OSI model is responsible for converting data into signals appropriate for the transmission medium?
Layer 1 \ Physical
Segmentation of data streams occurs at which layer of the OSI model?
Transport \ Layer 4
What is the correct order for data encapsulation?
Data, Segment, Packet, Frame, Bits
Acknowledgements, sequencing and flow control are characteristic of which OSI layer?
Layer 4 \ Transport
What is the purpose of flow control?
To provide a means for the receiver to govern the amount of data sent by the sender.
What layer of the OSI model does IP belong to?
Network \ Layer 3
