OSI L1-7 QA Flashcards
TCP/IP model does not have ______ layer but OSI model have this layer.
a) session layer
b) transport layer
c) application layer
d) network layer
Answer: a) session layer
Explanation: In OSI reference model, there are two layers which are not present in TCP/IP model. They are Presentation and Session layer. The functions of Presentation and Session layer in the OSI model are handled by the transport layer itself in TCP/IP.
TCP/IP model was developed _____ the OSI model.
a) prior to
b) after
c) simultaneous to
d) with no link to
Answer: a) prior to
Explanation: Several TCP/IP prototypes were developed at multiple research centers between 1978 and 1983, whereas OSI reference model was developed in the year 1984. TCP/IP was developed with the intention to create a model for the Internet while OSI was intended to be a general network model.
Which layer provides the services to user?
a) application layer
b) session layer
c) presentation layer
d) physical layer
Answer: a) application layer
Explanation: In networking, a user mainly interacts with application layer to create and send information to other computer or network. Application layer provides the interface between applications and the network. It is the top-most layer in both the TCP/IP and the OSI model.
The OSI reference model is a seven-layer reference model that originated from the
a) ISO standards committee
b) ITU standards committee
c) IEEE standards committee
d) ANSI standards committee
Answer : a) ISO - International Standards Organization
Which layers of the OSI model are referenced in the 802.11 standard? (choose two)
a) Application
b) Data-Link
c) Presentation
d) Physical
e) Transport
f) Network
Answer : b) Data-Link
Which layer of the OSI model converts packets into electrical or optical signals for sending on the transmission media ?
a) Application
b) Presentation
c) Physical
d) Session
Answer : c) Physical
Which layer provides error detection?
a) Application
b) Session
c) Transport
d) Datalink
Answer d) Datalink
Logical Link control sub layer provides error detection using Frame check sequence
What are the responsibilities of Transport Layer?
- Multiplexing and De-Multiplexing.
- Segmentation and Re-assembly.
- Flow Control.
- Error Correction.
- Connection Establishment.
- Sequencing.
- Acknowledgement.
- 3 way Handshake.
What are the responsibility of Datalink layer?
Framing,
Error detection,
CRC and
Physical Addressing is the task of DLL
• What is the function of the Application Layer in networking ?
Application Layer is responsible for providing a user interface in between user and Network with the help of applications like web browsers
• In which layer term “Frames” is used ?
Frames are PDU of Data Link Layer
• In which layer term “Packets” is used ?
Packets are PDU of Network Layer
• In which layer term “Segments” is used ?
Segments are used at Transport Layer
• Give some example for protocols work at Application layer ?
Application Layer Protocols are HTTP, HTTPs, Telnet, SSH, DNS, FTP, TFTP, DHCP, RIP
• Which layer provides logical addressing that routers will use for path determination ?
Network Layer
Which layer combines bits into bytes and bytes into frames, uses MAC addressing, and provide error detection ?
Data Link Layer
Which layer specifies voltage, wire speed, and pinout cables and moves bits between devices ?
Physical Layer
How Data breaks down on each layer from top to bottom ?
Encapsulation occurs in following format
Which layer defines how data is formatted, presented, encoded,and converted for use on the network ?
Presentation Layer
Which layer is responsible for creating, managing and terminating sessions between applications ?
Session Layer
What are the different network typologies in Physical layer ?
Mesh Star/Hub & Spoke Ring Bus Hybrid
Which layer provides the rules for framing, converting electrical signals to data, error checking, physical and media access control (MAC) addressing
Data Link Layer
What are 2 sub layers of Data Link Layer
- Logical Link Control
2. Media Access control
What are the Data Link Layer protocols ?
- Ethernet
- Token Ring
- FDDI
- IEEE 802.3
- IEEE 802.11
In which layer MAC address decides where to forward frames ?
Data Link Layer
IP of TCP/IP, ARP protocol is example of which layer ?
Network Layer
IPv4
- Uses ARP
- 32-bit address in quad-dotted from
- close to 4.3 billion addresses
IPv6
- Uses Neighbor Solicitation instead of ARP
- 128 bit address in 8 groups of 4 hexa decimals
- 3.4 undecillion addresses
Which layer provides transparent transfer of data between end system or hosts and is responsible for end-to-end error recovery and flow control
Transport Layer
Which layer is a persistent logical linking of two software application processes
Session layer
Which layer deals with data format conversion and possibly with encryption and security
Presentation layer
Which layer responsible for delivering and formatting of information application layer for further processing or display
Presentation layer
Which layer interacts with software application that implement a communicating component
Application Layer
Gateway is which layer device
Layer 7 Application Layer
