Download OSI Model Layers: Comprehensive Q&A for Network Studies and more Exams Computer Networks in PDF only on Docsity!
ITN 101: OSI LAYER: TEST QUESTIONS WITH COMPLETE
SOLUTIONS
The first layer of OSI model. -- Answer ✔✔ Physical Layer The second layer of OSI model. -- Answer ✔✔ Data Link Layer The third layer of OSI model. -- Answer ✔✔ Network Layer The forth layer of OSI model. -- Answer ✔✔ Transport Layer The fifth layer of OSI model. -- Answer ✔✔ Session Layer The sixth layer of OSI model. -- Answer ✔✔ Presentation Layer The seventh layer of OSI model. -- Answer ✔✔ Application Layer What is the application layer? -- Answer ✔✔ Describes the interface between two applications, each on separate computers. NOT the application themselves.
What protocols are used in the application layer? -- Answer ✔✔ HTTP, SMTP, POP3, IMAP4, DNS, FTP, Telnet, SSH, and RDP The first category applications use protocols for? -- Answer ✔✔ Applications that provide services to a user, such as a browser and web server using the HTTP application layer protocol The second category applications use protocols for? -- Answer ✔✔ Programs that monitor and gather information about network traffic and can alert network administrators about adverse conditions that need attention Payload definition (Application Layer) -- Answer ✔✔ Data that is passed between applications or utility programs and the operating system Hosts definition (Application Layer) -- Answer ✔✔ The two end-system computers that initiate sending and receiving data What is the Presentation Layer? -- Answer ✔✔ Responsible for reformatting, compressing, and/or encrypting data in a way that the application on the receiving end can read Example of the Presentation Layer (real world practice) -- Answer ✔✔ An email message can be encrypted at the presentation layer by the email client or by the operating system
What is Encapsulation (Transport Layer)? -- Answer ✔✔ The process of adding a header to the data inherited from the layer above What is a port (Transport Layer)? -- Answer ✔✔ A number that identifies a process, such as an application or service, running on a computer. What is it called when the transport layer divides a large message in a TCP protocol? -- Answer ✔✔ segment What is it called when the transport layer divides a large message in a UDP protocol? -- Answer ✔✔ datagram What is the Network Layer? -- Answer ✔✔ Responsible for moving messages from one node to another until they reach the destination host. (Where routers typically function) What is the protocol used in the Network Layer? -- Answer ✔✔ IP (Internet Protocol) What does the IP (Internet Protocol) do in the Network Layer? -- Answer ✔✔ Adds its own network layer header to the segment or datagram What is a packet (Network Layer)? -- Answer ✔✔ The entire network layer message including the protocols What is an IP address? -- Answer ✔✔ An address assigned to each node on a network, which the network layer uses to uniquely identify them across multiple networks.
What is the process when a network layer protocol divides the packet into smaller packets? -- Answer ✔✔ fragmentation Which layers of the OSI model are responsible for interfacing with the physical hardware on the local network? -- Answer ✔✔ Physical and Data Link where are the protocols programmed into in the physical and data link layer? -- Answer ✔✔ firmware of a computer's NIC What is the Data Link Layer? -- Answer ✔✔ The type of networking hardware or technology used on a network determines the data link layer protocol What are two examples of Data Link Layer protocol? -- Answer ✔✔ Ethernet and Wifi What is a Trailer (Data Link Layer)? -- Answer ✔✔ Control information attached to the end of a packet by a data link layer protocol What is a Frame (Data Link Layer)? -- Answer ✔✔ The entire data link layer message, including the header, payload, and trailer. What is the Physical Layer? -- Answer ✔✔ Responsible for sending bits via a wired or wireless transmission What is a PDU? -- Answer ✔✔ Protocol Data Unit is a group of bits of a message or transmission
