Saturday, August 20, 2011

ENetwork Chapter 9

Convert the binary number 10111010 into its hexadecimal equivalent. Select the correct answer from the list below.

  •     BA
Which of the following describe interframe spacing? (Choose two.)
  •     the minimum interval, measured in bit-times, that any station must wait before sending another frame
  •     the time allowed for slow stations to process a frame and prepare for the next frame
When a collision occurs in a network using CSMA/CD, how do hosts with data to transmit respond after the backoff period has expired?
  •     The hosts return to a listen-before-transmit mode.
After an Ethernet collision, when the backoff algorithm is invoked, which device has priority to transmit data?
  •     any device in the collision domain whose backoff timer expires first
Which of the following is a drawback of the CSMA/CD access method?
  •     Collisions can decrease network performance.

Refer to the exhibit. The switch and workstation are administratively configured for full-duplex operation. Which statement accurately reflects the operation of this link?
  •     No collisions will occur on this link.
Why do hosts on an Ethernet segment that experience a collision use a random delay before attempting to transmit a frame?
  •     A random delay helps prevent the stations from experiencing another collision during the transmission.


In the graphic, Host A has reached 50% completion in sending a 1 KB Ethernet frame to Host D when Host B wishes to transmit its own frame to Host C. What must Host B do?
  •     Host B must wait until it is certain that Host A has completed sending its frame.

Ethernet operates at which layers of the OSI model? (Choose two.)
  •     Physical layer
  •     Data-link layer

What does the IEEE 802.2 standard represent in Ethernet technologies?
  •     Logical Link Control sublayer
Which statements correctly describe MAC addresses? (Choose three.)
  •     copied into RAM during system startup
  •     contains a 3 byte OUI
  •     6 bytes long

Refer to the exhibit. Host_A is attempting to contact Server_B. Which statements correctly describe the addressing Host_A will generate in the process? (Choose two.)
  •     A frame with the destination MAC address of Router_A.
  •     A packet with the destination IP of Server_B.
Host A has an IP address of, a mask of, and a default gateway of Host A needs to send a packet to a new host whose IP is Host A performs the ANDing operation on its address and subnet mask. What two things will occur? (Choose two.)
  •     Host A will broadcast an ARP request for the MAC of the host
  •     Host A will change the destination IP of the packet to and forward the packet.
Which two features make switches preferable to hubs in Ethernet-based networks? (Choose two.)
  •     minimizing of collisions
  •     increase in the throughput of communications

Ethernet operates at which layer of the TCP/IP network model?
  •     network access
What are three functions of the upper data link sublayer in the OSI model? (Choose three.)
  •     identifies the network layer protocol
  •     makes the connection with the upper layers
  •     insulates network layer protocols from changes in physical equipment
What three primary functions does data link layer encapsulation provide? (Choose three.)
  •     addressing
  •     error detection
  •     frame delimiting
What are the two most commonly used media types in Ethernet networks today? (Choose two.)
  •     copper UTP
  •     optical fiber

Refer to the exhibit. Which option correctly identifies content that the frame data field may contain?
  •     network layer packet
What is the primary purpose of ARP?
  •     resolve IPv4 addresses to MAC addresses

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