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Question 48 - N10-009 discussion

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A virtual machine has the following configuration:

* IPv4 address: 169.254.10.10

* Subnet mask: 255.255.0.0

The virtual machine can reach colocated systems but cannot reach external addresses on the Internet. Which of the following Is most likely the root cause?

A.
The subnet mask is incorrect.
Answers
A.
The subnet mask is incorrect.
B.
The DHCP server is offline.
Answers
B.
The DHCP server is offline.
C.
The IP address is an RFC1918 private address.
Answers
C.
The IP address is an RFC1918 private address.
D.
The DNS server is unreachable.
Answers
D.
The DNS server is unreachable.
Suggested answer: B

Explanation:

Understanding the 169.254.x.x Address:

An IPv4 address in the range of 169.254.x.x is an Automatic Private IP Addressing (APIPA) address, assigned when a DHCP server is unavailable.

DHCP Server Offline:

APIPA Assignment: When a device cannot obtain an IP address from a DHCP server, it assigns itself an APIPA address to enable local network communication. This allows communication with other devices on the same local subnet but not with external networks.

Resolution: Ensure the DHCP server is operational. Check for connectivity issues between the virtual machine and the DHCP server, and verify the DHCP server settings.

Comparison with Other Options:

The subnet mask is incorrect: The subnet mask 255.255.0.0 is appropriate for the 169.254.x.x range and does not prevent external access by itself.

The IP address is an RFC1918 private address: RFC1918 addresses are private IP ranges (10.x.x.x, 172.16.x.x-172.31.x.x, 192.168.x.x) but 169.254.x.x is not one of them.

The DNS server is unreachable: While this could affect name resolution, it would not prevent the assignment of a non-APIPA address or local network communication.

Troubleshooting Steps:

Verify the DHCP server's status and connectivity.

Restart the DHCP service if necessary.

Renew the IP lease on the virtual machine using commands such as ipconfig /renew (Windows) or dhclient (Linux).

CompTIA Network+ study materials on IP addressing and DHCP troubleshooting.

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asked 02/10/2024
Jose Osnayo
44 questions
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