MODULE 13 CISCO CCNA I STUDY GUIDE EXAM QUESTIONS

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MODULE 13 CISCO CCNA I STUDY GUIDE EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -14 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: What new protocols are included with ICMPv6? What is each of these

messages used for? Know how they are used.

Answer:

The new protocols that are included with ICMPv6 are part of the Neighbor Discovery Protocol (ND or NDP)

• Router Solicitation (RS) message
• Router Advertisement (RA) message
• Neighbor Solicitation (NS) message
• Neighbor Advertisement (NA) message

NS and NA messages are used for:

• Address resolution - used when a device on the LAN knowns the IPv6 unicast address of a destination

but does not know its MAC address

• Duplicate Address Detection (DAD)
• performed on the address to ensure that it is unique
• the device will send a NS message with its own IPv6

address as the targeted IPv6 address Question 2: Not necessarily, it could be that you don't have the right IP address or your request could time out if the router was busy with other messages.

Answer:

How does traceroute work? What type of output does it produce?

Question 3: This verifies communication on the local network, the operation of the router service as the default gateway and the operation of all other routers that might be in the path between the local network and the network of the remote host.

Answer:

If you don't receive a successful ping response, does that indicate a problem with your network?

Question 4: What is ICMP? Why is it used?

Answer:

ICMP is Internet Control Message Protocol which provides feedback about issues related to the processing of IP packets under certain conditions.Question 5: Pinging the configured IP on a host test that it is a reachable device and that you can communicate with it on the network.

Answer:

What can you verify with a successful ping to the default gateway?

Question 6: Why might an ICMP Destination Unreachable message be used?

Answer:

• an ICMP destination unreachable message can be used to notify the source that a destination or

service is unreachable

• the ICMP message will include a code indicating why the packet could not be delivered

Question 7: to verify that your TCP/IP is installed, started and working properly

Answer:

What are the IPv4 and IPv6 loopback addresses?

Question 8: IPv4 loopback address - 127.0.0.0/8

IPv6 loopback address - ::1/128

Answer:

What does pinging the configured IP on a host test?

Question 9: Why is an ICMP Time Exceeded message sent?

Answer:

An ICMP Time Exceeded message notifies a host when a packet it sent has been discarded because it was "out of time".

Question 10: Should you rely on ICMP messages for troubleshooting and to alert you about network issues?

Answer:

No Question 11: With a successful ping to the default gateway, you can verify that the host and the router interface serving as the default gateway are both operational on the local network.

Answer:

What can you verify with a successful ping to a remote host?

Question 12: What types of ICMP messages are common to both v4 and v6?

Answer:

ICMPv4 is the messaging protocol for IPv4 and ICMPv6 is the messaging protocol for IPv6 and includes additional functionality.The ICMP messages common to both ICMPv4 and ICMPv6 include host reachability, destination or service unreachable, and time exceeded.

1) Host Reachability - ICMP Echo Message can be used to test the reachability of a host on an IP network

2) Destination or Service Unreachable - an ICMP Destination Unreachable message can be used to notify the source that a destination or service is unreachable; the ICMP message will include a code indicating why the packet could not be delivered

3) Time exceeded - when the Time to Live (TTL) field in a packet is decremented to 0, and ICMPv4 Time Exceeded message will be sent to the source host

• ICMPv6 also sends a time exceeded message. instead of the IPv4 TTL field, ICMPv6 uses the IPv6

Hop Limit field to determine if the packet has expired

Question 13: Know how ping works.

Answer:

The ping command first sends an echo request packet to an address and then waits for a reply, the ping is successful only if the echo request gets to the destination and the destination is able to get an echo reply back to the source within a predetermined time called a timeout.

Question 14: Know the output that is generated when a ping is issued.

Answer:

What does pinging the loopback test?