TTL is the function of preventing loops in multicast.

Question

Options

• ATRUE
• BFALSE
• C
• D

• A
  78% (40)
• B
  12% (6)
• C
  6% (3)
• D
  4% (2)

Explanation

Option A is correct because TTL (Time To Live) is a field in the IP packet header that decrements by 1 at each router hop. When the TTL reaches zero, the router discards the packet and sends an ICMP "Time Exceeded" message back to the source. This mechanism ensures that multicast packets cannot circulate indefinitely if a routing loop exists, giving TTL its loop-prevention role.

Option B (FALSE) is wrong because TTL genuinely does prevent infinite loops - without it, a misconfigured multicast network could cause packets to bounce between routers forever, consuming bandwidth and crashing the network.

Options C and D are empty distractors with no content, so they can be immediately eliminated.

Memory tip: Think of TTL as a "hop budget." Every router that forwards the packet spends one unit from that budget. When the budget hits zero, the packet dies - so even if it's caught in a loop, it can't live forever. "TTL = Temporary Traffic Limiter."

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