City Guilds Model Questions Vol1 2024 Information Technology Question 24

Practice objective / multiple choice question 24 from the 2024 City Guilds Model Questions Vol1 Information Technology examination.

City Guilds Model Questions Vol1 2024 Information Technology Objective / Multiple Choice Hard Difficulty
Question 24 CITY_GUILDS_MODEL_QUESTIONS_VOL1 • 2024 • INFORMATION_TECHNOLOGY • objective

A user on the corporate LAN cannot access any web sites. The observations are: • The user can ping the default gateway (192.168.1.1) in 2 ms. • The user can ping the DNS server (192.168.1.53) in 5 ms. • The user can ping the external IP address 8.8.8.8 in 20 ms. • DNS look‑ups fail; nslookup for www.google.com returns "server failed". • A packet capture on the DNS server shows incoming DNS queries from the user's IP address but no DNS replies are sent. • The DNS server's firewall has a rule allowing inbound UDP port 53 only from the subnet 192.168.1.0/24. The user's IP address is 192.168.2.10. Identify the most probable cause of the problem and state the corrective action required.

Answer Options

Correct Answer A. The DNS server firewall blocks the user's subnet (192.168.2.0/24) from receiving UDP/53 replies. Fix by adding a rule to allow DNS traffic from that subnet (or place the user in the allowed subnet).
B. The firewall on the user's workstation is blocking outbound DNS queries; disable the local firewall or allow UDP/53.
C. The user's default gateway is misconfigured; update the gateway IP to 192.168.1.1.
D. The DNS server is down; restart the DNS service to restore resolution.
Correct Answer
A
Correct Option:
The DNS server firewall blocks the user's subnet (192.168.2.0/24) from receiving UDP/53 replies. Fix by adding a rule to allow DNS traffic from that subnet (or place the user in the allowed subnet).

About This Question

This is City Guilds Model Questions Vol1 2024 Information Technology Question 24. It is one of the objective questions from the 2024 City Guilds Model Questions Vol1 Information Technology examination.

Difficulty level: Hard .

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