XK0-005 Question #298: Real Exam Question with Answer & Explanation

Question

A newly installed desktop is unable to connect to networked resources. The systems administrator executes various commands and reviews the following output snippets: Which of the following should the systems administrator try NEXT to restore connectivity?

Options

• Aarp -s 20:ad:1f:ab:10:0f 192.168.1.10
• Broute add -net 192.168.1.0 netmask 255.255.255.0
• Cdig -x @127.0.0.1 192.168.1.10
• Dip link set wlo1 up
• Ekillall -HUP NetworkManager

Explanation

If a network interface is down, it must be brought up before any network connectivity can be established.

Common mistakes.

• A. arp -s adds a static ARP entry, which is used for resolving IP to MAC addresses, and is not the first step to restore general connectivity if the interface itself is down.
• B. route add adds a static network route; this is only necessary if routing tables are incorrect after the interface is up and has an IP address.
• C. dig -x performs a reverse DNS lookup, and using 127.0.0.1 (localhost) as the DNS server for an external IP address is unlikely to resolve a connectivity issue.
• E. killall -HUP NetworkManager restarts the NetworkManager service, which might resolve some configuration issues, but it's not the most direct fix if a specific interface is explicitly down.

Concept tested. Bringing up a network interface

Reference. https://man7.org/linux/man-pages/man8/ip-link.8.html

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