- 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.
2 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.
3 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
4 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
5 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
6 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.
7 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.*
8 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
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 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.*
11 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.
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