CCNA Ch. 6 Data Link Layer 001

*the use of full-duplex capable Layer 2 switches

Although CSMA/CD is still a feature of Ethernet, why is it no longer necessary?

WAN

Network that uses point to point, hub and spoke, or mesh topologies?

*It accepts Layer 3 packets and encapsulates them into frames. *It provides media access control and performs error detection.

What are two services performed by the data link layer of the OSI model?

IP address, *MAC address, RJ-45 port, TCP/IP protocol stack

What attribute of a NIC would place it at the data link layer of the OSI model?

*determines the best path, de-encapsulates the frame, re-encapsulates the packet into a new frame, forwards the new frame onto the network medium

What does a router do after de-encapsulating a received frame?

MAC address

What identifier is used at the data link layer to uniquely identify an Ethernet device?

CSMA/CD, priority ordering, *CSMA/CA, token passing

What method is used to manage contention-based access on a wireless network?

Accepts, de-encaps, re-encaps

What three Layer 2 functions does a router perform?

*CSMA/CD, determinism, turn taking, token passing

Which data link layer media access control method does Ethernet use?

to identify the type of network layer protocol being used

Which is a function of the Logical Link Control (LLC) sublayer?

ISO and ITU

Which two engineering organizations define open standards and protocols that apply to the data link layer?