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Home Cisco® 200-150

Cisco® 200-150 Exam Practice Questions (P. 3)

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Question #11
In an IEEE 802.3 Ethernet frame, what is the significance of the DSAP field?
  1. A
    The DSAP field specifies the TCP or UDP port that is associated with the transport protocol.
  2. B
    The DSAP field is only used on United States Department of Defense networks to indicate the information classification level.
  3. C
    The DSAP field is only used in Ethernet II frames.
  4. D
    The DSAP field indicates the network layer protocol.

Correct Answer:
D

Question #12
Which field in an Ethernet II frame performs the same function as the DSAP field in an 802.3 Ethernet frame?
  1. A
    Start of frame
  2. B
    EtherType
  3. C
    Frame check sequence
  4. D
    Subnetwork Access Protocol
  5. E
    Logical Link Control

Correct Answer:
B

Question #13
What are two features of a bridge? (Choose two.)
  1. A
    Reliable transmission
  2. B
    Operate at OSI Layer 2
  3. C
    Operate at OSI Layer 3
  4. D
    Create multiple broadcast domains
  5. E
    Create multiple collision domains
  6. F
    Flood input packets to all ports
  7. G
    Drop IP packets with invalid destination ports

Correct Answer:
BE
"- a bridge is a two interfaces device that creates 2 collision domains, since it forwards the traffic it receives from one interface only to the interface where the destination layer 2 device (based on his mac address) is connected to. A bridge is considered as an "intelligent hub" since it reads the destination mac address in order to forward the traffic only to the interface where it is connected" https://learningnetwork.cisco.com/thread/1734

Question #14
What are three reasons that switches supersede bridges? (Choose three.)
  1. A
    Smaller frame buffers decrease latency.
  2. B
    Forward, filter, or flood frames.
  3. C
    Multiple simultaneous communications between ports.
  4. D
    Larger inspection engine allows for higher throughput.
  5. E
    Switches have many ports.

Correct Answer:
BCE
http://docwiki.cisco.com/wiki/Bridging_and_Switching_Basics

Question #15
What action does a switch take if the destination MAC address is unknown?
  1. A
    Discard frame
  2. B
    Send ICMP unreachable message to source
  3. C
    Flood packet on all ports
  4. D
    Compare destination IP address against an ACL to determine if it is permitted
  5. E
    Send gratuitous ARP on all ports and wait for reply before forwarding

Correct Answer:
C
"What happens though when the switch receives a frame with a destination MAC address that is not included in the table? In that case the switch will just broadcast/flood the frame with theunknown destination address to all of its ports (apart from the port where the frame came from).
This process is called unknown unicast flooding. "
http://telconotes.wordpress.com/2013/03/09/how-a-switch-works/

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