1. Which organization publishes and manages the Request for Comments (RFC) documents?
- ISO
- IETF
- IEEE
- TIA/EIA
Explanation: The Internet Engineering Task Force (IETF) organization publishes and manages the Request for Comments (RFC).
2. What identifier is used at the data link layer to uniquely identify an Ethernet device?
- UDP port number
- MAC address
- TCP port number
- IP address
- sequence number
Explanation: Ethernet frames are identified at the data link layer by their MAC addresses, which are unique to each NIC. IP addresses are used at the network layer, and TCP and UDP port numbers are used at the transport layer. Sequence numbers are fields in TCP headers.
3. Which three layers of the OSI model are comparable in function to the application layer of the TCP/IP model? (Choose three.)
- physical
- application
- transport
- network
- data link
- session
- presentation
Explanation: The TCP/IP model consists of four layers: application, transport, internet, and network access. The OSI model consists of seven layers: application, presentation, session, transport, network, data link, and physical. The top three layers of the OSI model: application, presentation, and session map to the application layer of the TCP/IP model.
4. Which term refers to the set of rules that define how a network operates?
- protocol
- domain
- model
- standard
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.
5. Which standards organization publishes current Ethernet standards?
- IEEE
- CCITT
- EIA/TIA
- ANSI
Explanation: The IEEE standards describe current Ethernet features. The IEEE standard for Ethernet is 802.3.
6. Which statement describes a MAC address?
- It contains two portions, the network portion and the host portion.
- It identifies the source and destination addresses of hosts on the Internet.
- It is a physical address assigned to an Ethernet NIC by the manufacturer.
- It is 128-bits in length.
Explanation: The Media Access Control (MAC) address is a physical address assigned to each Ethernet NIC by manufacturers. It is 48-bits in length. The MAC address is used to identify the source and destination on a local Ethernet network. It cannot be routed to remote networks.
7. Which three elements do all communication methods have in common? (Choose three.)
- message data
- message destination
- message type
- message priority
- message source
- transmission medium
Explanation: All communication methods include a message source, destination, and a transmission medium.
8. Which two layers of the OSI model specify protocols that are associated with Ethernet standards? (Choose two.)
- network layer
- physical layer
- transport layer
- session layer
- data link layer
Explanation: Ethernet standards specify protocols that operate at Layer 1 (physical layer) and Layer 2 (data link layer) of the OSI model and it is the technology used by almost all wired local-area networks.
9. Which layer of the OSI model defines services to segment and reassemble data for individual communications between end devices?
- network
- presentation
- transport
- application
- session
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.
10. Which statement defines a data communications protocol?
- a set of product standards for types of network devices
- an exchange agreement of network devices among vendors
- a set of rules that govern the communication process
- an alliance of network device manufacturers
Explanation: A data communication protocol is a set of rules that govern the communication process.