312-49 · Question #382
312-49 Question #382: Real Exam Question with Answer & Explanation
The correct answer is B: Test ability of a router to handle over-sized packets. The nmap flag --data_length 66000 appends 66,000 bytes of random data to each probe packet. Since the maximum legal IPv4 packet size is 65,535 bytes, packets of this size exceed the allowed maximum and are considered oversized (jumbo/malformed) packets. This tests how a router ha
Question
What will the following command accomplish? C:\> nmap -v -sS -Po 172.16.28.251 - data_length 66000 - packet_trace
Options
- ATest the ability of a router to handle under-sized packets
- BTest ability of a router to handle over-sized packets
- CTest the ability of a WLAN to handle fragmented packets
- DTest the ability of a router to handle fragmented packets
Explanation
The nmap flag --data_length 66000 appends 66,000 bytes of random data to each probe packet. Since the maximum legal IPv4 packet size is 65,535 bytes, packets of this size exceed the allowed maximum and are considered oversized (jumbo/malformed) packets. This tests how a router handles such abnormally large packets — whether it drops, fragments, or crashes on them. The -sS flag performs a TCP SYN (stealth) scan, -v enables verbose output, -Po skips the ping pre-check, and --packet-trace shows each packet sent and received.
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