Refer to the exhibit. A TCP segment was sent by PC1 to the web server via port 80. Because of an unexpected network failure, the data was forwarded by R1 but was not received by R2. Which statement is correct about this scenario?
- The web server will not acknowledge this segment. The PC1 timer will expire and PC1 will resend the segment.
- R1 forwarded the data to R2 but R2 did not receive it. R2 will send a request to R1 to resend the segment.
- The timer on R1 will expire and R1 will resend the segment to R2.
- R1 will request that PC1 resend the segment.
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Explanation: The TCP protocol works between end devices, not between each device on the network. Routers, switches, etc. do not participate in the packet recovery process. For each TCP segment (or group of segments) sent by a host, there is an acknowledgment. If the sender does not receive an acknowledgment within a period of time, the sender resends the segment. |