1. The only time a host does not need to use ARP is when transmitting broadcast/multicast packets where you can easily translate network-layer addresses to MAC addresses. In all other cases, the host will need to determine the MAC address using ARP (or its cache)
2. As per the link from Leo, Router B will answer this query but only if:
- the address being ARPed for is not on the subnet between router A and router C
- C has a route to that subnet
- proxy-ARP is enabled on C's interface to A
However, C will respond with it's own MAC address, not that of router B. This is the concept of Proxy ARP.
[toc:faq]The ProblemOn traditional switches whenever we have a trunk
interface we use the VLAN tag to demultiplex the VLANs. The switch needs
to determine which MAC Address table to look in for a forwarding
decision. To do this we require the switch to do...
[toc:faq]Introduction:Netdr is a tool available on a RSP720, Sup720 or
Sup32 that allows one to capture packets on the RP or SP inband. The
netdr command can be used to capture both Tx and Rx packets in the
software switching path. This is not a substitut...
IntroductionOSPF, being a link-state protocol, allows for every router
in the network to know of every link and OSPF speaker in the entire
network. From this picture each router independently runs the Shortest
Path First (SPF) algorithm to determine the b...