1. What are two services performed by the data link layer of the OSI model? (Choose two.)
- It encrypts data packets.
- It determines the path to forward packets.
- It accepts Layer 3 packets and encapsulates them into frames.
- It provides media access control and performs error detection.
- It monitors the Layer 2 communication by building a MAC address table.
- It accepts Layer 3 packets and encapsulates them into frames.
- It provides media access control and performs error detection.
Path determination is a service provided at Layer 3. A Layer 2 switch builds a MAC address table as part of its operation, but path determination is not the service that is provided by the data link layer.
2. What does a router do after de-encapsulating a received frame?
- determines the best path
- de-encapsulates the frame
- re-encapsulates the packet into a new frame
- forwards the new frame onto the network medium
1. Accepts a frame from a medium
2. De-encapsulates the frame
3. Determines the best path to forward the packet
4. Re-encapsulates the packet into a new frame
5. Forwards the new frame appropriate to the medium of that segment of the physical network
3. What attribute of a NIC would place it at the data link layer of the OSI model?
- attached Ethernet cable
- IP address
- MAC address
- RJ-45 port
- TCP/IP protocol stack
4. Although CSMA/CD is still a feature of Ethernet, why is it no longer necessary?
- the virtually unlimited availability of IPv6 addresses
- the use of CSMA/CA
- the use of full-duplex capable Layer 2 switches
- the development of half-duplex switch operation
- the use of Gigabit Ethernet speeds
5. What type of physical topology can be created by connecting all Ethernet cables to a central device?
- bus
- ring
- star
- mesh
6. A technician has been asked to develop a physical topology for a network that provides a high level of redundancy. Which physical topology requires that every node is attached to every other node on the network?
- bus
- hierarchical
- mesh
- ring
- star
7. Which statement describes the half-duplex mode of data transmission?
- Data that is transmitted over the network can only flow in one direction.
- Data that is transmitted over the network flows in one direction at a time.
- Data that is transmitted over the network flows in one direction to many different destinations simultaneously.
- Data that is transmitted over the network flows in both directions at the same time.
- Simplex – Data can only flow in one direction.
- Half-duplex – Data flows in one direction at a time.
- Full-duplex – Data flows in both directions at the same time.
8. Which is a function of the Logical Link Control (LLC) sublayer?
- to define the media access processes that are performed by the hardware
- to provide data link layer addressing
- to identify which network layer protocol is being used
- to accept segments and package them into data units that are called packets
9. Which data link layer media access control method does Ethernet use?
- CSMA/CD
- determinism
- turn taking
- token passing
10. What are the two sublayers of the OSI model data link layer? (Choose two.)
- internet
- physical
- LLC
- transport
- MAC
- network access
11. What method is used to manage contention-based access on a wireless network?
- CSMA/CD
- priority ordering
- CSMA/CA
- token passing
12. What identifier is used at the data link layer to uniquely identify an Ethernet device?
- IP address
- MAC address
- sequence number
- TCP port number
- UDP port number
13. Which two engineering organizations define open standards and protocols that apply to the data link layer? (Choose two.)
- International Organization for Standardization (ISO)
- Internet Assigned Numbers Authority (IANA)
- International Telecommunication Union (ITU)
- Electronic Industries Alliance (EIA)
- Internet Society (ISOC)
14. Which layer of the OSI model is responsible for specifying the encapsulation method used for specific types of media?
- application
- transport
- data link
- physical
15. What is true concerning physical and logical topologies?
- The logical topology is always the same as the physical topology.
- Physical topologies are concerned with how a network transfers frames.
- Physical topologies display the IP addressing scheme of each network.
- Logical topologies refer to how a network transfers data between devices.