UDP and ICMP GCIA Practice Questions (Page 7)

Questions 31–33

1. 31application · medium

   A network administrator is troubleshooting a connectivity issue. A packet capture shows an ICMP Destination Unreachable message with code 4 (Fragmentation Needed and DF Set). What does this message indicate?

   • AThe destination host is unreachable because it is down.
   • BThe packet was too large to forward and the Don't Fragment (DF) bit was set.
   • CThe destination port is closed and no application is listening.
   • DThe packet's TTL expired before reaching the destination.
   Reveal Solution Discussion Select an answer first
2. 32foundation · easy

   Which characteristic best describes UDP?

   • AConnection-oriented but unreliable
   • BConnectionless but reliable
   • CConnection-oriented and reliable
   • DConnectionless and unreliable
   Reveal Solution Discussion Select an answer first
3. 33application · medium

   An analyst is monitoring network traffic and sees a large number of UDP packets sent to a single destination IP on port 53. The packets are all the same size and originate from different source ports. What is the most likely explanation?

   • AA normal DNS query from a single client using multiple source ports.
   • BA UDP-based file transfer using port 53.
   • CA DNS amplification attack using spoofed source addresses.
   • DA misconfigured router sending ICMP error messages to the DNS server.
   Reveal Solution Discussion Select an answer first