Question: Suppose an IP implementation adheres literally to the following algorithm on receipt of a packet, P, destined for IP address D: (a) If the IP

Suppose an IP implementation adheres literally to the following algorithm on receipt of a packet, P, destined for IP address D:

if ((Ethernet address for D is in ARP cache)) (send P) else

(a) If the IP layer receives a burst of packets destined for D, how might this algorithm waste resources unnecessarily?

(b) Sketch an improved version.

(c) Suppose we simply drop P, after sending out a query, when cache lookup fails. How would this behave? (Some early ARP implementations allegedly did this.)

if ((Ethernet address for D is in ARP cache)) (send P) else (send out an ARP query for D) (put P into a queue until the response comes back)

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