5.4.3 Communications Principles Quiz Answers. Networking Basics Module 5 quiz exam answers
1. What is the purpose of the OSI physical layer?
- controlling access to media
- transmitting bits across the local media
- performing error detection on received frames
- exchanging frames between nodes over physical network media
Explanation: The physical layer is responsible for transmitting the actual signals across the physical media as bits. Exchanging frames, controlling media access, and performing error detection are all functions of the data link layer.
2. Which statement is correct about network protocols?
- Network protocols define the type of hardware that is used and how it is mounted in racks.
- They define how messages are exchanged between the source and the destination.
- They all function in the network access layer of TCP/IP.
- They are only required for exchange of messages between devices on remote networks.
Explanation: Network protocols are implemented in hardware, or software, or both. They interact with each other within different layers of a protocol stack. Protocols have nothing to do with the installation of the network equipment. Network protocols are required to exchange information between source and destination devices in both local and remote networks.
3. Which three acronyms/initialisms represent standards organizations? (Choose three.)
- IANA
- TCP/IP
- IEEE
- IETF
- OSI
- MAC
Explanation: TCP/IP is a protocol stack that contains a lot of other protocols such as HTTP, FTP, and DNS. The TCP/IP protocol stack is required to be used when communicating on the internet. A MAC address is an address that is burned into an Ethernet network card. OSI is the 7 layer model that is used to explain how networking works.
4. What networking term describes a particular set of rules at one layer that govern communication at that layer?
- duplex
- encapsulation
- error checking
- protocol
Explanation: A protocol dictates how a message is formatted and sets the rules for specific parts of the communication process.
5. Which layer of the OSI model defines services to segment and reassemble data for individual communications between end devices?
- application
- presentation
- session
- transport
- network
Explanation: The OSI model consists of seven layers: application, presentation, session, transport, network, data link, and physical. The transport layer defines services to segment, transfer, and reassemble the data for individual communications between the end devices.
6. What is the purpose of protocols in data communications?
- specifying the bandwidth of the channel or medium for each type of communication
- specifying the device operating systems that will support the communication
- providing the rules required for a specific type of communication to occur
- dictating the content of the message sent during communication
Explanation: Protocols provide rules that define how a message is transmitted across a network. Implementation requirements such as electronic and bandwidth details for data communication are specified by standards. Operating systems are not specified by protocols, but will implement protocols. Protocols determine how and when to send a message but they do not control the contents of a message.
7. Which term refers to the set of rules that define how a network operates?
- standard
- protocol
- model
- domain
Explanation: Standards ensure that different devices connecting to the network are able to communicate with each other. In networking there are many standards that define how the network should operate and that all components implement the same protocols.
8. Which three layers of the OSI model make up the application layer of the TCP/IP model? (Choose three.)
- data link
- network
- transport
- session
- presentation
- application
Explanation: The top three layers of the OSI model, session, presentation, and application, map to the single top application layer of the TCP/IP model.
9. Which organization publishes and manages the Request for Comments (RFC) documents?
- IEEE
- ISO
- IETF
- TIA/EIA
Explanation: The Internet Engineering Task Force (IETF) organization publishes and manages the Request for Comments (RFC).
10. Which two OSI model layers have the same functionality as a single layer of the TCP/IP model? (Choose two.)
- data link
- network
- physical
- session
- transport
Explanation: The OSI data link and physical layers together are equivalent to the TCP/IP network access layer. The OSI transport layer is functionally equivalent to the TCP/IP transport layer, and the OSI network layer is equivalent to the TCP/IP internet layer. The OSI application, presentation, and session layers are functionally equivalent to the application layer within the TCP/IP model.
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