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Question 102 - XK0-005 discussion

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A server is experiencing intermittent connection issues. Some connections to the Internet work as intended, but some fail as if there is no connectivity. The systems administrator inspects the server configuration:

Which of the following is MOST likely the cause of the issue?

A.
An internal-only DNS server is configured.
Answers
A.
An internal-only DNS server is configured.
B.
The IP netmask is wrong for ens3.
Answers
B.
The IP netmask is wrong for ens3.
C.
Two default routes are configured.
Answers
C.
Two default routes are configured.
D.
The ARP table contains incorrect entries.
Answers
D.
The ARP table contains incorrect entries.
Suggested answer: C

Explanation:

The most likely cause of the issue is that two default routes are configured on the server. The default route is the route that is used when no other route matches the destination of a packet. The default route is usually the gateway that connects the local network to the Internet. The server configuration shows that there are two default routes in the routing table, one with the gateway 192.168.1.1 and the other with the gateway 10.0.0.1. This can cause a conflict and confusion for the server when deciding which gateway to use for the outgoing packets. Some packets may be sent to the wrong gateway and fail to reach the Internet, while some packets may be sent to the correct gateway and work as intended. This can result in intermittent connection issues and inconsistent behavior. The administrator should remove one of the default routes and keep only the correct one for the network. This can be done by using the ip route del command or by editing the network configuration files. This will resolve the issue and restore the connectivity. The other options are incorrect because they are not supported by the outputs. The DNS server, the IP netmask, and the ARP table are not the causes of the issue. Reference: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 12: Managing Network Connections, pages 381-382.

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asked 02/10/2024
HNO Oo
39 questions
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