Figure 9.7 shows a system as either a host or a router. What would be the actual entity (host or router) of system A and B in each of the following cases:

Figure 9.7

a. If the link is the first one in the path?
b. If the link is the middle one in the path?
c. If the link is the last one in the path?
d. If there is only one link in the path (local communication)?

Transcribed Image Text:

LAN System A System B N, L, N, L2 Request N3L3 N, L4 Request: Looking for link-layer address of a node with IP address N2 a. ARP request is broadcast LAN System A System B N2L2 ¡N, L, Reply N4 L4 N3L3 Reply: I am the node and my link-layer address is L2 b. ARP reply is unicast