Semestre 2 - Module 8

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1 Which layer protocols provide reliability for IP when needed?

ICMP and ping


upper layer protocols *

lower layer protocols

Internet layer protocols

network access layer protocols

2 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.

3 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.


4 If workstation 4 sends a message to workstation 2 and it is not delivered, which protocol will report this failure?

Internet Protocol

User Datagram Protocol

Transmission Control Protocol

Internet Control Message Protocol *

5 What does a router do if it is unable to deliver a packet to its destination? (Choose two.)

The router sends the original packet back to the source.

The router keeps the packet in its buffer until the next routing table update.

The router sends an ICMP "Destination Unreachable" message back to the source. *

The router sends out a broadcast message in search of the destination.

The router discards the original packet. *

6 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.

7 Which confirms the availability of a destination? (Choose two.)

The source issues an echo reply after receiving an echo request from the destination.

The destination returns an exact copy of the data sent by the source. *

The source sends an echo request and receives an echo reply. *

The source sends the data to the destination without receiving a reply.

The destination sends an echo request and receives an echo reply.

8 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.

9 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.*

10 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

11 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.

12 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

13 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

14 Which ICMP message is sent to a source host when the hop count to the destination is greater than the TTL value of a packet?

echo reply

timestamp reply

destination unreachable

time exceeded *

source quench

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