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CCNA 2 - Module 8 Exam

1 How does a source host use ICMP to confirm that a destination host is reachable?
• The source host sends an ICMP echo request to the destination router which responds with an ICMP echo reply confirming the reachability of the destination host.
• The source host sends a data packet and receives an ICMP host unreachable packet from the destination host if the data packet cannot be delivered.
• The source host sends an ICMP packet with a TTL value of 1 and receives an ICMP reply with a TTL value of 0 from the destination host.
• The source host sends an ICMP echo request and receives an ICMP echo reply from the destination host.


2 Which type of message is generated by a host when the ping command is entered?
• ICMP echo request
• ICMP echo reply
• UDP echo request
• UDP error message

3 Which of the following start the test of destination reachability?
• echo request issued by source
• echo reply issued by source
• echo request issued by destination
• echo reply issued by destination


4 Which two statements are true regarding ICMP? (Choose two.)
• ICMP provides reliability for the TCP/IP protocol stack.
• ICMP is a component of the TCP/IP protocol stack.
• ICMP notifies the sender that data transmission errors have occurred.

• ICMP is connection-oriented.
• ICMP messages are propagated to all intermediate devices.


5 How does ICMP improve data transfer reliability in IP networks?
• Each router in the path reads ICMP packets and uses the information to update routing tables.
• ICMP can correct many network problems as they occur.
• ICMP error messages are returned to the sending device when a packet is dropped by a router.
• ICMP packets report the intermediary devices that a packet passed through before failure occurred.


6 Which layer protocols provide reliability for IP when needed?
• ICMP and ping
• RIP and TTL
• upper layer protocols
• lower layer protocols
• Internet layer protocols
• network access layer protocols


7 Which devices along a data transmission path are notified by ICMP when delivery failures occur?
• source devices only
• destination devices only
• intermediary devices
• source and destination devices
• source, intermediary, and destination devices


8 When a datagram is processed by a router on the path from source to destination, what happens to the value in the TTL field?"
• It is increased by one.
• It is decreased by one.
• It stays the same.
• It is reset to 0.
• Nothing.


9 Which condition could cause a fragmentation needed ICMP destination unreachable message to be sent?
• A low bandwidth WAN link has become congested with IP traffic.
• A packet is forwarded from a Token Ring network to an Ethernet network.
• A network is not reachable because of faulty routing information.
• The address specified by the sending host is nonexistent.


10

Workstation 1 sent a data packet to Workstation 4. It never arrived because Fa0/0 interface went down on Router C. How will the devices handle this failure?
• Workstation 4 will send an error message to Router C and Workstation 1 that it did not receive the packet.
• Router C will use ICMP to send a message back to Workstation 1 indicating that the packet could not be delivered.
• Router C discards the packet without providing notification to any device.
• Router C uses ICMP to correct the failure and transmits the data to Workstation 4.
• Workstation 1 will use ICMP to correct the problem and then notify Router C to continue the transmission.


11 Which three conditions must be met in order for host to host communication over an internetwork to occur on IP networks? (Choose three.)
• The routing protocols configured on the source and destination networks must be the same.
• A default gateway must be properly configured on the hosts and local networks.
• Intermediary devices, such as routers, must be present on the network and have knowledge of how to reach the destination network.

• The source and destination host subnet masks must match.
• The IP addresses of the hosts must be in the same network or subnet as their respective gateway devices.

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