Layers Flashcards
What are the 7 layers of the OSI Model?
L7 ApplicationL6 PresentationL5 SessionL4 TransportL3 NetworkL2 Data LinkL1 Physical
Name some protocols and services that run at L7 (Application Layer)?
Email Protocols SMTP and Pop3TelnetHTTPFile Transfer Protocol( FTP)Simple Network Management Protocol (SNMP)
Name the four primary tasks that the Presentation Layer is concerned with.
- Compatibility with the operating system.2. Proper encapsulation of data for network transmission.3. Data formatting (ASCII, Binary)4. Data encryption, compression and translation
What is the Application Layer (L7)?
It’s where the end users interact with the network.
What is the Presentation Layer (L6)?
How the data is presented.
What are some file types in the Presentation Layer?
JPEG, ASCII, GIF, MPEG, MIDI, EBCDIC, and TIFF
What is the Session Layer (L5)?
It handles the creation, maintenance and teardown of communications between those two hosts.
What is the Transport Layer (L4)?
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.
What are the two methods for transporting data?
Connection-oriented, referring to TCP and connectionless, referring to UDP.
Besides TCP and UDP, what is also a Transport Layer?
SPX (Sequenced Packet Exchange) NCP (Novell Netware protocol.
The Network Layer (L3) is also called what?
The Routing Layer
What layer does IP run at?
The Network Layer
What is the two-question process in the Network Layer?
What valid paths exist from the local router to a given destination?What is the best path (optimal path) to take to get there?
What layer is the Data Link?
L2
What is a WAP?
Wireless Access Points
What runs at L2?
Cable Modems and DSL Modems
What four major specifications run at L2?
EthernetHigh Data Link Control (HDLC)Point-to-Point Protocol (PPP)Frame Relay
What is HDLC?
High Data Link Control
What is PPP?
Point-to-Point Protocol
Does the Data Link Laer perform error detection?
Yes
The Data Link Layer performs error detection through the what?
The Frame Check Sequence
MAC addresses are sometimes called what?
hardware addresses and physical addresses
What is a burned-in address?
MAC address that is physically burned into the Network Interface Card (NIC)
What does NIC stand for?
Network Interface Card
What does BIA stand for?
a burned-in address
Physical addresses are used in what layer?
Data Link Layer
A physical address is used to deliver?
A frame, not a physical layer address
Physical cable, pins, Connectors and the electrical current, run at which layer?
Physical Layer
Which layers is the data simply called data?
Application, Presentation and Session Layers
Which layer is data placed into segments?
Transport Layer
What layer is data placed into packets?
Network Layer
What layer is data placed into frames?
Data Link Layer
What layer takes the form of bits?
Physical Layer
Which layer is all ones and zeros?
Physical Layer
Which layer adds a header and a trailer?
L2 Data Link Layer
What does PDU stand for?
Protocol Data Unit
What is a Protocol Data Unit?
A combination of data and layer-specific header.
SPX stands for?
Sequenced Packet Exchange
SNMP stands for?
Simple Network Management Protocol
