OSI Model Flashcards
(55 cards)
Layer 6
Presentation Layer
-Transforms data between the format required for the network and the format required for the application.
Layer 7
Layer 5
Session Layer
-Represents functions that administer the process of establishing a dialog, managing data transfer, and then ending (or tearing down) the session.
-opening, closing, and maintaining connections between applications
Layer 2
Data Link Layer
-Responsible for transferring data between nodes on the same logical segment
What are the functions of a network protocol?
Addressing and encapsulation
-Addressing describes where data messages should go. At each layer, there are different mechanisms for identifying nodes and rules on how they can send and receive messages.
Encapsulation describes how the system should package data messages for transmission. Encapsulation is like an envelope for a letter, with the distinction that each layer requires its own envelope.
Private IP address range
192.168.0.0 - 192.168.255.255
MTU
Maximum Transmission Unit
-A limit on the maximum amount of data that can be transmitted over a network without fragmentation
In the OSI model, the layer 4 TCP PDU is known as:
Segment
In the OSI model, the layer 3 PDU is known as:
Packet
In the OSI model, the layer 2 PDU is called:
Frame
True or false? The DHCP server in the SOHO router assigns an IP address to the WAN interface automatically
False
The DHCP server in the SOHO router assigns IPadrresses to the hosts on the local network. The WAN address is likely to be assigned by DHCP, but a DHCP server is managed by the acces provider
How is the decimal value 171 expressed in hex?
0xAB
To work this out, divide 171 by 16 (10) and write the remainder (11) as the least significant hex digit (B). Note that the quotient 10 (the integer part of the sum, where 171/16-10.6875) is less than 16. Convert the quotient to hex (10=A) to derive the second hex digit and complete the conversion.
Data Link Layer Responsibility
Transferring data between nodes
Network Layer Responsibility
Logical network addressing and forwarding
Session Layer Responsibility
Provides services for applications that need to exchange multiple messages (dialog control)
Transport Layer Responsibility
Transforms data between the formats used by the network and applications
Application Layer Responsibility
Providing support to applications requiring network services (file transfer, printing, email, databases, and so on)
What fiber optic connector has a push/pull mechanism?
Subscriber Connector
What fiber optic connector has a bayonet-style coupling mechanism?
Straight Tip Connector
What fiber optic connectors is a duplex connector?
MT-RJ
What is Fast Link Pulse?
Sends link integrity test signals
Cable crimper
Creates a patch cord that fixes a plug to a cable
Block tool
Terminates a group of connectors in one action
Punchdown Tool
Terminates a fixated cable and fixes conductors into an IDC
