OSI Model Flashcards
Encryption resides at what layer of the OSI Model?
Presentation (6)
Which layer establishes, manages, and terminates sessions between two communicating hosts?
Session (5)
Which layer synchronizes dialog between the Presentation Layers of the two hosts and manages their data exchange?
Session (5)
`Which layer has the two main functions for choosing Protocol & Ports?
Transport (4)
What layer defines services to segment, transfer and reassemble the data for individual communications between the end devices?
Transport (4)
Which layer breaks down large files into smaller segments that are less likely to incur transmission problems?
Transport (4)
Which layer provides transparent transfer of data between hosts and is responsible for end to end error recovery and flow control?
Transport (4)
Which layer synchronizes and establishes an agreement on procedures for error recovery and control of data integrity?
Application (7)
Which layer is responsible for tracking and keeping control of the different sessions on a host known as Session Multiplexing?
Transport (4)
Which layer is responsible for Quality of Service (QoS)?
Network (3)
Time to Live (TTL) resides at this layer
Network (3)
Which layer provides connectivity and path selection between two host systems that may be located on geographically separated networks?
Network (3)
Frames reside at which layer?
Datalink (2)
Segments reside at which layer?
Transport (4)
Bits reside at which layer?
Physical (1)
Packets reside at which layer?
Network (3)
What process takes place during packet creation?
Encapsulation
What is a PDU?
Stands for Protocol Data Unit. A PDU is one chunk of data comprised of Data, Segments, Packets, Frames and Bits. Each one corresponding to the layer in which it came from.
What does FCS stand for and what does it do?
Frame Check Sequence. It is error detecting code added to a frame in the datalink layer (2)
ICMP lives at which layer?
Network Layer (3)
What is the maximum size of a packet?
1500 byte MTU (Maximum Transmission Unit)
IP (Internet Protocol) resides at which layer?
Network (3)
IPSec lives at which layer?
Network (3)
What layer starts and ends the session between devices?
Session (5)
How many TCP Ports are available to use?
65,536
What are ports used for?
To segment communication
Which layer does logical addressing live at?
Network (3)
Which layer do MAC Addresses live at?
Datalink (2)
How many bits is a MAC Address?
48 Bit Hexadecimal
What are the first 24 bits of a MAC Address?
OUI (Organizationally Unique Identifier). It defines the manufacturer
What are the last 24 bits of a MAC Address?
Vendor assigned
LLDP is a protocol at which layer?
Datalink (2)
Ethernet is a protocol at which layer?
Datalink (2)
CDP (Cisco Discovery Protocol) is a protocol at which layer?
Datalink (2)
Which layer defines specifications needed for activating, maintaining, and deactivating the physical link between end devices?
Physical (1)
What is Flow Control?
Flow control is the process of adjusting the flow of data from the sender to ensure that the receiving host can handle all of it
