OSI Model Questions and Answers 100%
Verified
What layer is the Application Layer? ✔✔Layer 7
What layer is the Presentation Layer? ✔✔Layer 6
What layer is the Session layer? ✔✔Layer 5
What layer is the Transport lay
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OSI Model Questions and Answers 100%
Verified
What layer is the Application Layer? ✔✔Layer 7
What layer is the Presentation Layer? ✔✔Layer 6
What layer is the Session layer? ✔✔Layer 5
What layer is the Transport layer? ✔✔Layer 4
What layer is the Network layer? ✔✔Layer 3
What layer is the Datalink layer? ✔✔Layer 2
What layer is the Physical layer? ✔✔Layer 1
What is the function of the Application layer? ✔✔Works with specific networking applications
such as web browser programs, file transfer programs and email.
What is the function of the Presentation layer? ✔✔*Ensures character code recognition
* Responsible for converting character codes into a code that is recognizable by a computer that
uses a different code.
What is the function of the Session layer? ✔✔*Establishes a different connection between two
different computers - control dialog between source and destination node, which node can send
and for how long.
*Provides security based on computer and username recognition and handles error processing.
What is the function of the Transport layer? ✔✔*Main responsibility is to ensure reliable data by
sequencing packets and reassembling them into their correct order meaning to guarantee the
packet will be delivered in the same order sent.
*Delivery guaranteed by sending an acknowledgment back to the source when messages are
received.
What is the function of the Network layer? ✔✔*Responsible for routing packets from one
network to the other using IP addressing format.
What is the function of the Datalink layer? ✔✔* Describes how the raw data is packaged to
transfer from one network interface card to another.
* Consists of cable and connectors used for constructing networks.
What is the function of the Physical layer? ✔✔Only concerned with how digital signals (binary
1's and 0's) are carried electronically from one network device to another. Communicates directly
with the physical media.
The upper layers of the OSI model are: ✔✔Application Layer - Layer 7
Presentation Layer - Layer 6
Session Layer - Layer 5
The lower layers of the OSI model are: ✔✔Transport - layer 4
Network - layer 3
Data link - layer 2
Physical - layer 1
Define the acronym OSI ✔✔Open Systems Interconnected
What is the purpose of the OSI model? ✔✔The OSI Reference Model is valuable as a tool for
explaining how networks function, and for describing the relationships between different
networking technologies and protocols.
What does data encapsulation mean when referring to the OSI model? ✔✔When a network
device sends a message, the message will take the form of a packet. Each OSI (open system
interconnection) model layer adds a header to the packet. The packet is then covered with some
information directing it onward to a destination; this is analogous to the address on a letter in
which the actual message is wrapped or carried inside an envelope.
What does data de-capsulation mean? ✔✔The reverse of data encapsulation is decapsulation,
which refers to the successive layers of data being removed or unwrapped at the receiving end of
the network.
Examples of protocols that work on the Application layer are: ✔✔TELNET, HTTP, FTP, TFTP,
SMTP and NTP.
Examples of protocols used at the Presentation layer: ✔✔Defines encryption, compression,
conversion and other coding functions for GIF, JPEG, MPEG, MIME and ASCII
Examples of protocols/APIs that work at the Session layer are: ✔✔RPC (remote procedure call)
and NETBIOS
Examples of protocols operate at the Transport layer: ✔✔TCP, UDP, NETBEUI and SPX
Examples of protocols/devices which operate at the Network layer: ✔✔Protocols: IP, IPX,
ICMP, RIP, OSPF and BGP.
Devices: layer 3 switches and routers.
Examples of devices working at the Data Link layer are: ✔✔switchs, bridges, WAPs (Wireless
Application Protocol) and NICs (Network Inferface Connection)
Examples of devices working at the Physical layer are: ✔✔hubs/concentrators, repeaters, NICs,
WAPs and LAN and WAN interfaces.
What is the purpose of knowing the following mnemonic
ALL People Seem To Need Data Processing ✔✔Layers of the OSI model starting with the
highest layer down to the lowest layer.
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