ユーザーが Web サーバーにアクセスできず、トラフィックがキャプチャされた後、キャプチャ ツールが ICMP パケットを通知し、「転送中に時間が超過しました」と報告します。この Web サーバー アクセスの問題の原因は何ですか?
正解:A
An ICMP "time exceeded in-transit" message indicates that the TTL (Time to Live) of a packet has expired. The TTL value is a counter that decreases by one each time the packet passes through a router. When the TTL reaches zero, the packet is discarded, and an ICMP "time exceeded" message is sent back to the sender. This typically happens when the packet takes too many hops or the destination is too far away, causing the TTL to expire before reaching the destination. Reference: Cisco DevNet ICMP Time Exceeded