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Question 775 - N10-008 discussion

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An application is not working. When the log files are reviewed, the application continuously tries to reach the following destination:

Which of the following is most likely associated with this IP address?

A.
APIPA
Answers
A.
APIPA
B.
Default gateway
Answers
B.
Default gateway
C.
Link local
Answers
C.
Link local
D.
Loopback
Answers
D.
Loopback
Suggested answer: D

Explanation:

The IP address ::1/128 is the loopback address of the local host in IPv6, which is the equivalent of the 127.0.0.1 in IPv4. The loopback address is a virtual interface that loops all traffic back to itself, the local host. The loopback address is used for testing and troubleshooting purposes, such as checking the connectivity and configuration of the network stack. If an application tries to reach the loopback address, it means that it is not communicating with any external network or server, but only with itself.

The other options are not correct because they are not associated with the IP address ::1/128. They are:

APIPA. APIPA stands for Automatic Private IP Addressing, which is a feature that allows a device to assign itself a private IPv4 address in the range of 169.254.0.0/16 when no DHCP server is available. APIPA does not apply to IPv6 addresses, and it is not related to the loopback address.

Default gateway. The default gateway is the IP address of the router or device that connects a local network to other networks. The default gateway is usually the first or last usable IP address in a subnet, and it is not the same as the loopback address.

Link local. Link local addresses are IPv6 addresses that are used for communication within a single network segment or link. Link local addresses have the prefix fe80::/10, and they are not routable or reachable from other networks. Link local addresses are not the same as the loopback address.

Reference 1:Loopback Address - ::1/128 - ipUpTime.net 2:Network+ (Plus) Certification | CompTIA IT Certifications 3:Reserved IP addresses - Wikipedia

asked 02/10/2024
Vu Tung
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