N10-005 · Question #680
Based on the packet capture below, which of the following services is the client requesting? 08:30:54.982378192.168.50.42.8329 > 192.168.50.20.53: S 32859235:32859235(0) win 8096…
The correct answer is D. DNS. The packet capture shows traffic directed to port 53 on the destination hosts (192.168.50.20.53 and 192.168.50.51.53). Port 53 is the well-known port for DNS (Domain Name System), the service that resolves hostnames to IP addresses. ARP operates at Layer 2 and would not appear…
Question
Based on the packet capture below, which of the following services is the client requesting? 08:30:54.982378192.168.50.42.8329 > 192.168.50.20.53:
S 32859235:32859235(0) win 8096 08:30:55.001378192.168.50.20.53 > 192.168.50.42.8329:
S 31845637: 31845637(0) ack 32859236 win 8096 08:30:55.027578192.168.50.42.8329 > 192.168.50.51.53:
ack 1 win 8096
Options
- AARP
- BSMTP
- CDHCP
- DDNS
How the community answered
(22 responses)- A9% (2)
- B5% (1)
- C5% (1)
- D82% (18)
Explanation
The packet capture shows traffic directed to port 53 on the destination hosts (192.168.50.20.53 and 192.168.50.51.53). Port 53 is the well-known port for DNS (Domain Name System), the service that resolves hostnames to IP addresses. ARP operates at Layer 2 and would not appear in this format, SMTP uses port 25, and DHCP uses ports 67/68 - none of which match the port 53 seen in the capture.
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