ExamGecko
Question list
Search
Search

List of questions

Search

Related questions











Question 246 - XK0-005 discussion

Report
Export

A Linux system is having issues. Given the following outputs:

# dig @192.168.2.2 mycomptiahost

; << >> DiG 9.9.4-RedHat-9.9.4-74.el7_6.1 << >> @192.168.2.2 mycomptiahost

; (1 server found)

;; global options: +cmd

;; connection timed out; no servers could be reached

# nc -v 192.168.2.2 53

Ncat: Version 7.70 ( https://nmap.org/ncat )

Ncat: Connection timed out.

# ping 192.168.2.2

PING 192.168.2.2 (192.168.2.2) 56(84) bytes of data.

64 bytes from 192.168.2.2: icmp_seq=1 ttl=117 time=4.94 ms

64 bytes from 192.168.2.2: icmp_seq=2 ttl=117 time=10.5 ms

Which of the following best describes this issue?

A.
The DNS host is down.
Answers
A.
The DNS host is down.
B.
The name mycomptiahost does not exist in the DNS.
Answers
B.
The name mycomptiahost does not exist in the DNS.
C.
The Linux engineer is using the wrong DNS port.
Answers
C.
The Linux engineer is using the wrong DNS port.
D.
The DNS service is currently not available or the corresponding port is blocked.
Answers
D.
The DNS service is currently not available or the corresponding port is blocked.
Suggested answer: D

Explanation:

The ping command shows that the Linux system can reach the DNS server at 192.168.2.2, so the DNS host is not down. The dig and nc commands show that the Linux system cannot connect to the DNS server on port 53, which is the standard port for DNS queries. This means that either the DNS service is not running on the DNS server, or there is a firewall or network device blocking the port 53 traffic.Therefore, the DNS service is currently not available or the corresponding port is blocked. Reference 1:How To Troubleshoot DNS Client Issues in Linux - RootUsers 2:6 Best Tools to Troubleshoot DNS Issues in Linux - Tecmint 3:How To Troubleshoot DNS in Linux - OrcaCore 4:Fixing DNS Issues in Ubuntu 20.04 | DeviceTests

asked 02/10/2024
Carlos Periterra
40 questions
User
Your answer:
0 comments
Sorted by

Leave a comment first