Pass Linux+ Exams Using Cryptography Next Generation

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5. You have just been asked to troubleshoot intermittent communication problems on a fairly old network for a company that builds and repairs elevator motors. You have determined that the net- work is a straightforward thin-coax Ethernet Windows NT LAN running TCP/IP. The company wants to upgrade to Windows Server 2008, hoping that the now-stable platform will resolve the intermittent problems. You perform the upgrade; all goes smoothly, and initially ccna exam answers
everything seems to function properly. However, the intermittent problems show up again. What layer in the OSI model is the most likely place for the problems to be occurring?

A. Physical layer
B. Data-Link layer
C. Network layer
D. Transport layer
E. Session layer

Answer: A. The Physical layer is concerned with signaling, specifically through electrical, optical, or radio signals. The high voltage associated with large motors can easily cause an interruption in the sig- naling of coax cable. There have been many cases of people running network cable through ele- vator shafts ...
... in a building because of the ease a practice exams
of access, only to have the network malfunction every time someone summons the car. The other layers are associated with software and are beyond the reach of most electrical interference unless it affects the entire workstation.

6. This sublayer, the lower of two sublayers, provides for shared access to the network adapter and communicates directly with network interface cards. A unique 48-bit address, commonly represented as a 12-digit hexadecimal address, is assigned to network interface cards before they leave the factory where they are made. What is the name of this sublayer?

A. The TCP/IP sublayer
B. The ISO sublayer
C. The MAC sublayer
D. The ARP sublayer
E. The LLC sublayer

Answer: C. The IEEE split the ISO Data-Link layer into the LLC sublayer and the MAC sublayer. The MAC sublayer, the lower of the two sublayers, provides for shared access to the network adapter and communicates directly with network interface cards. A unique 48-bit address, commonly represented as a 12-digit hexadecimal MAC address (frequently called the hard- ware Ethernet address ), is assigned to network interface cards before they leave the factory where they are made.