CH3 Flashcards
The OSI Model has _____ layers?
7
Write down a mnemonic you use to remember the OSI Model?
All People Seem To Need Data Protection
Application + Presentation + Session + Transport + Network + DataLink + Physical
TCP is Connection-Less Protocol?
True
False
False
TCP is a Connection-Oriented Protocol.
UDP is a Connection-Less
What is a unit of data called at the Transport Layer?
Packet
Segment
Frame
Protocol Datat Unit (PDU)
Segment
Which of the following could be a valid MAC Address for a Server named Server 1?
Server1
192.168.1.5
A4-BA-10B-FA-60-AD
G4-BA-10B-FA-60-AT
A4-BA-DB-FA-60-AD
Media Access Control (MAC) address, or physical address, is composed of 6 pairs of hexadecimal characters.
Valid hexadecimal characters are from 0 to 9 and A to F.
IPv4 operates on the _____ layer of the OSI Model?
Network
Both IPv4 and IPv6 operate in the Network Layer.
List the protocols that operate on the Transport Layer of the OSI Model?
TCP and UDP
Several other Transport Layer protocols exist.
Devices that operate on layer 7 of the OSI Model are more intelligent than devices that operate on layer 1?
True
False
True
Devices such as Hubs on Layer 1 have very little intelligence.
Devices such as Advanced Firewallls on Layer 7 have much more intelligence.
Routers operate on which of the following layers of the OSI Model?
Layer 1 Layer 2 Layer 3 Layer 4 NONE of the Above
Layer 3
Routers operate on the Network layer - Layer 3.
Proxy Servers operate on which of the following layers of the OSI Model?
Layer 1 Layer 2 Layer 3 Layer 4 NONE of the Above
None of the Above
Proxy Servers operate on the Application Layer, Layer 7 of the OSI Model.
OSI Model - Layer 3?
Network (Need)
Decides which physical path the data will take. Responsible for routing the data packet based on it's logical IP Address Fragments and reassembles the packets Instructs data on how to find it's ultimate destination.
OSI Model - Layer 7?
Application (All)
Human Computer Interaction layer, where applications can access the network services. Manages communications between Applications Supports Application protocols such as Email, HTTP, and FTP At this Layer, Data still resembles something People can Read.
OSI Model - Layer 2?
Data Link (Data)
Defines the format of data on the network Responsible for sending data to the physical layer. Data packets are encoded and decoded into bits Handles flow control and frame synchronization. Divided into 2 sub lyers --- MAC (Media Access Control) and the LLC (Logical Link Control) layer.
OSI Model - Layer 1?
Physical (Protection)
Transmits raw bit stream over the physical medium. Defines the network standards and physical characteristics of a network such as connectors, media type's, cables, voltages. Defines the Topology of a Network.
OSI Model - Layer 4?
Transport (To)
Transmits data using transmission protocols including TCP and UDP Provides the transfer of Data between End Users Responsible for resending any packets that do not receive an acknowledgement from the destination. This layer can guarantee that packets are received.