In IPv4 router that handles a datagram decrements the time to live (TTL) field i

Question

In IPv4 router that handles a datagram decrements the time to live (TTL) field in the header (Fig 2.2a) by the number of seconds that the datagram remains at the router or by 1 if it is less than one second. When a router receives a datagram whose TTL is 1, it may not forward the datagram but must discard it; if a destination end system receives such a datagram, it may deliver it to the IP user. If a datagram remains at a router for a longer period of time than the incoming TTL, it must be discarded. Now consider a router with an infinite buffer in steady-state overload. The packet arrival rate exceeds the rate at which packets can be transmitted. The router employs no congestion control techniques other than discard. What can you say about the number of proportion of packets flowing through this router that will successfully reach their destination? In IPv4 router that handles a datagram decrements the time to live (TTL) field in the header (Fig 2.2a) by the number of seconds that the datagram remains at the router or by 1 if it is less than one second. When a router receives a datagram whose TTL is 1, it may not forward the datagram but must discard it; if a destination end system receives such a datagram, it may deliver it to the IP user. If a datagram remains at a router for a longer period of time than the incoming TTL, it must be discarded. Now consider a router with an infinite buffer in steady-state overload. The packet arrival rate exceeds the rate at which packets can be transmitted. The router employs no congestion control techniques other than discard. What can you say about the number of proportion of packets flowing through this router that will successfully reach their destination?

Explanation / Answer

The number of proportion of packets flowing through the router that will reach their destination will be less. It is so, because the arrival rate is more than the transmission rate and the overflown packets are discarded. Also, the packets with TTL as 1 will be discarded. Since the proportion of packets that are being discarded is more, the proportion of packets that will reach the destination is less.

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